Teaching, working at the restaurant, online work and freelancing are the work that make money.
How do I get money in real life?In real life, we can get money by doing teaching in the school or academy, working at the restaurant or any other public places. Freelancing and online teaching are the best jobs for making good money. Doing small business able you to make good money in a short period of time. Make deliveries on Amazon and start your own business. So there are a lot of jobs for making money and better your financial condition.
So we can conclude that teaching, working at the restaurant, online work and freelancing are the work that make money.
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4. Long answer type questions: a. b. C. d. e. f. g. h. j. i. What are the constituent gases of air? Why is the surrounding air not seen with the eyes? How do you prove that air supports burning? How do you show that air occupies space? How do you prove that air has weight? How is air useful to us? Mention any three points. Write any three properties of air. How can you say that air exerts force? Write any four effects of air pollution. Write any three causes of air pollution and any two control measures of it.
1. The constituent gases of air are:
Nitrogen Oxygen Argon Carbon Dioxide2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.
What is air?3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.
4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.
5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.
6. Air is useful to us in various ways. Three points highlighting the importance of air are:
Breathing and RespirationCombustion and Energy ProductionClimate Regulation7. Three properties of air include:
Air is Compressible: Air can be compressed or expanded under different conditions, allowing it to fill various spaces and containers.Air has Mass: Air molecules have mass, which means air itself has weight. It exerts pressure on objects and surfaces.Air Exerts Pressure: Due to the collisions of air molecules with surfaces, air exerts pressure in all directions. This pressure is known as atmospheric pressure.Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.
8. Four effects of air pollution include:
Respiratory ProblemsEnvironmental Damage:Climate ChangeHuman Health Impacts9. Causes of pollution:
Industrial EmissionsVehicle EmissionsResidential and Agricultural Activities10. Two control measures for air pollution include:
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What is the lowest possible value for n, the principal energy level?
The lowest principal energy level that is possible to find is 1.
It means that the correct answer is 1.
convert 7.54 x 10^-8 m to nanometers
7.54 *\(10^8\) meters is 75.4 nanometers.
To convert 7.54 * \(10^8\) meters to nanometers, you can multiply the value by \(10^9\)
as, \(10^9\)nanometers = 1 meter.
7.54 * \(10^8\) m * \(10^9\) = 7.54 x \(10^1\) nm
Therefore, 7.54 *\(10^8\) meters is equal to 75.4 nanometers.
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To convert 7.54 x 10^-8 meters to nanometers, you multiply 7.54 x 10^-8 by 1 x 10^9 to get 75.4 nanometers.
Explanation:To convert meters to nanometers, you need to know that 1 meter is equivalent to 1 x 109 nanometers. Therefore, if you were to convert 7.54 x 10-8 m to nanometers, you would multiply 7.54 x 10-8 by 1 x 109.
Here's how you'd do it: 7.54 x 10-8 m * 1 x 109 nm/m = 75.4 nm. So, 7.54 x 10-8 meters is equivalent to 75.4 nanometers.
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A chemist requires a large amount of 1-bromo-4-phenyl-2-butene as starting material for a synthesis and decides to carry out the following NBS allylic bromination reaction in the presence of UV light. Draw the structures of all of the observed products.
NBS
(C6H5)CH2CH = CHCH3 → ?
CCI4
Draw one additional resonance structure for the species below:
CH3CH=CHCH=CHCH=CHCH2
Answer:
CH 2 CH 3 CHCH = C6H5 + 5 Hydrogen Atoms
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What factor is mostly responsible for the form of matter?
time
temperature
pressure
weather
Temperature is mostly responsible for the form of matter. For instance, when raising the temperature you're adding energy. This energy gives the individual molecules and atoms the ability to overcome the forces that hold them together. This can be seen when a solid turns into a liquid or a liquid turns into a gas. However, when you're lowering the temperature you're removing energy. The lack of energy results in less movement from the atoms. Gases condense into liquid because the atoms don't have enough energy to stay away from each other. Liquids solidify because the atoms don't have enough energy to slide past each other and they get stuck in place. So in conclusion, temperature determines how how much energy atoms have that allow them to move at different speeds which determines the state of matter.
Scientists classify organisms into three domains and six kingdoms. In which
kingdom are yeasts classified and why?
A Plantae, because they are eukaryotic.
B Protista, because they are prokaryotic.
Fungi, because they are heterotrophic.
Animalia, because they are autotrophic.
Answer:
c is correct option
according to the question.
Scientists classify organisms into three domains and six kingdoms. In Fungi kingdom are yeasts classified because they are heterotrophic. Therefore, option C is correct.
What do you mean by the term heterotrophic ?An organism is referred to be a heterotroph if it is unable to manufacture food on its own and must obtain it from other sources of organic carbon, primarily plant or animal materials.
All fungi are heterotrophic, which means they draw their energy from other living things.
Since they share some traits with fungi, such as the presence of chitin in their cell walls, extracellular digestion, saprophytic feeding, asexual reproduction by budding, and the ability to store food as glycogen, yeast cells are categorised as fungi.
Thus, option C is correct.
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Is magnesium oxide a base, fuel, or acid?
Answer:
a base
Explanation:
the the largest four digit number 3629
Answer:
9999
Explanation:
If you do 10,000 that would be too much
Zinc metal reacts with sulfuric acid, H,SO, in a single replacement reaction. Write balanced equation
The balanced equation for the single replacement reaction between zinc metal (Zn) and sulfuric acid (H2SO4) is: Zn + H2SO4 → ZnSO4 + H2
In the reaction, zinc metal displaces hydrogen from sulfuric acid to form zinc sulfate and release hydrogen gas. The equation is said to be balanced in terms of atoms and charge.
The equation on the left side, is having one zinc atom (Zn) and one molecule of sulfuric acid (H2SO4). The sulfuric acid molecule contains single sulfur atom (S), two hydrogen atoms (H), and four oxygen atoms (O).
The equation on the right side, is having one molecule of zinc sulfate (ZnSO4) and one molecule of hydrogen gas (H2). The zinc sulfate molecule consists of single zinc atom, single sulfur atom, and four oxygen atoms.
Therefore, the equation is balanced because it follows the law of conservation of mass and charge. The same types and same number of atoms are present on both the sides of the equation, That means no atoms are created or destroyed during the reaction.
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which is the graph of the function g(x) = f(-x)
To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.
What is a graph of the function g(x) = f(-x)?To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.
If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).
However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.
In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.
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what is the product of the reaction of 2,2-dichloro-3-methylbutane with water. how does this product react with OH-
The reaction of 2,2-dichloro-3-methylbutane with water results in the formation of 3-methyl-2-butanol, which can react with OH- in a nucleophilic substitution reaction to form 3-methyl-2-butyl alcohol and water.
The reaction can be represented by the following equation:
2,2-dichloro-3-methylbutane + H2O → 3-methyl-2-butanol + H+ + Cl-
The reaction of 2,2-dichloro-3-methylbutane with water can result in the formation of an alcohol and a hydrogen ion. The product of this reaction is 3-methyl-2-butanol.
The reaction can be represented by the following equation:
2,2-dichloro-3-methylbutane + H2O → 3-methyl-2-butanol + H+ + Cl-
In this reaction, one of the chlorine atoms from 2,2-dichloro-3-methylbutane is replaced by a hydroxyl group (-OH) from water, resulting in the formation of an alcohol group (-OH) in the product, 3-methyl-2-butanol. The other chlorine atom remains as an ion, Cl-.
The product, 3-methyl-2-butanol, can react with OH- in a nucleophilic substitution reaction. In this reaction, the hydroxide ion (OH-) acts as a nucleophile and attacks the carbon atom that is attached to the leaving group (the -OH group) in the 3-methyl-2-butanol molecule. The leaving group then departs with its pair of electrons, forming a new bond with the nucleophile (OH-). The result is the formation of a new alcohol molecule.
The reaction can be represented by the following equation:
3-methyl-2-butanol + OH- → 3-methyl-2-butyl alcohol + H2O
In this reaction, the -OH group of 3-methyl-2-butanol is replaced by the hydroxide ion (OH-) to form 3-methyl-2-butyl alcohol, and a water molecule is formed as a byproduct.
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Which symbol in a chemical equation separates the reactants from the products?
Answer:
The arrow symbol in a chemical equation separates the reactants from products. A chemical reaction is process in which chemical changes leads to the formation of products from reactants.
Explanation:
An element has 2 stable isotopes. One has 13 amu and 1.07% abundant . The second has 12 amu and 98.93% abundant. What is the average atomic mass of the element
The average atomic mass of the element is 12.0107 amu.
To calculate the average atomic mass of the element in question, we can use the following formula:
average atomic mass = (mass of isotope 1 x abundance of isotope 1) + (mass of isotope 2 x abundance of isotope 2)
where "mass of isotope 1" is the mass of the first stable isotope (13 amu in this case), "abundance of isotope 1" is the percentage of that isotope in the element (1.07% in this case), "mass of isotope 2" is the mass of the second stable isotope (12 amu in this case), and "abundance of isotope 2" is the percentage of that isotope in the element (98.93% in this case).
Substituting the given values in the formula, we get:
average atomic mass = (13 amu x 1.07%) + (12 amu x 98.93%)
average atomic mass = (0.1391 amu) + (11.8716 amu)
average atomic mass = 12.0107 amu
Therefore, the average atomic mass of the element is 12.0107 amu.
This means that on average, one atom of this element weighs 12.0107 atomic mass units (amu), which is slightly heavier than the most abundant isotope (12 amu) due to the presence of the less abundant isotope (13 amu). This concept is important in chemistry because the mass of atoms plays a crucial role in determining their chemical and physical properties. The knowledge of the average atomic mass of an element is important in a wide range of applications, including analytical chemistry, geochemistry, and nuclear physics.
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When lead (II) nitrate reacts with sodium iodide, sodium
nitrate and lead (II) iodide are formed. If you start with 25.0
grams of lead (II) nitrate and 15.0 grams of sodium iodide, how
many grams of sodium nitrate can be formed?
Answer:
20.44 grams of sodium nitrate can be formed
Explanation:
The balanced chemical equation for the reaction between lead (II) nitrate and sodium iodide is:
Pb(NO3)2 + 2NaI → 2NaNO3 + PbI2
Then, using information from the “Atomic Zoom-In” article, explain why two substances have different properties to a member of your household.
You may work with more than one member of your household.
You might need to explain a little about what properties are and the different properties the two substances have in order for your household member to be able to work with you.
When you are finished, ask the person what she learned about properties. Record the answer below.
What did your household member learn about properties?
Answer: Two substances have different properties because they are made of different types and numbers of atoms that repeat.
Explanation: According to the article “Atomic Zoom-In”, all matter is made of tiny pieces called atoms, and there are 118 different types of atoms in the universe. Every substance is made of a unique combination of atoms, which can be represented by a chemical formula. The chemical formula shows the types and numbers of atoms that repeat to make up a substance.
For example, water has a chemical formula of H2O, which means it is made of groups of 2 hydrogen atoms and 1 oxygen atom. Substances have different properties because they are made of different types and numbers of atoms that repeat.
For example, water and ethanol are both clear liquids, but they have different properties such as boiling point, density, and flammability. This is because water is made of H2O groups, while ethanol is made of C2H6O groups.
The different types and numbers of atoms affect how the molecules interact with each other and with other substances, resulting in different properties. Therefore, to explain why two substances have different properties, we need to look at their chemical formulas and see how their atoms differ.
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In the synthesis reaction, how many grams of magnesium were there in the crucible before heating? Select one:
a. 8.3 g b. 6.2 g c. 4.1 g d. 5.0 g
Magnesium was 5.0g before heating.
Synthesis reaction: It is the type of reaction in which two different atom reacts to form different molecule or compound.When exposed to oxygen, magnesium turns into magnesium oxide. Burning of a piece of magnesium(Mg) wire in the air(oxygen) results in the production of Magnesium oxide(MgO).Go through the given link below to know more about magnesium:-
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A student planned to make copper sulfate crystals from excess copper oxide and dilute sulfuric acid.
The equation for the reaction is:
CuO(s) + H,SO (aq) -, CuSO (aq) + H20(1)
This is the method used.
1. Add 25 cm° of dilute sulfuric acid to a conical flask.
2. Gently warm the dilute sulfuric acid.
3. Add excess copper oxide to the dilute sulfuric acid.
4. Stir the mixture.
5. Heat to evaporate all the water from the mixture.
Suggest two improvements to the method
Explain why each improvement is needed.
A student plans a method to prepare pure crystals of copper sulfate.
The student's method is:
1. Add one spatula of calcium carbonate to dilute hydrochloric acid in a beaker.
2. When the fizzing stops, heat the solution with a Bunsen burner until all the liquid is gone.
The method contains several errors and does not produce copper sulfate crystals.
Explain the improvements the student should make to the method so that pure crystals of copper sulfate are produced.
The student's method for preparing pure crystals of copper sulfate contains errors and does not produce the desired outcome.
Use copper oxide instead of calcium carbonate: The student should add copper oxide (CuO) to the hydrochloric acid instead of calcium carbonate. Copper oxide reacts with hydrochloric acid to form copper chloride, which can then be converted to copper sulfate through a subsequent reaction with sulfuric acid.
Add sulfuric acid to the copper chloride solution: After the copper chloride solution is formed, the student should add sulfuric acid to it. This reaction between copper chloride and sulfuric acid will yield copper sulfate and hydrochloric acid. The student should ensure that the correct stoichiometric ratio is maintained to maximize the yield of copper sulfate crystals.
Crystal formation: The student should allow the solution to cool slowly after the reaction with sulfuric acid. This promotes the formation of larger, well-defined copper sulfate crystals.
Filtration and drying: Once the crystals have formed, the student should filter the solution to separate the solid crystals from the remaining liquid. The filtered crystals should then be thoroughly dried to remove any remaining water, resulting in pure copper sulfate crystals.
By following these improvements, the student can obtain pure crystals of copper sulfate.
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Complete and balance the following half-reaction in acidic solution. Be sure to include the proper phases for all species within the reaction.
S2O3 2- (aq) --> S4O6 2- (aq)
We must take into consideration the balance of atoms and charges in order to balance the half-reaction for the conversion of S2O3 2- to S4O6 2- in acidic solution.
Write the imbalanced half-reaction as the first step.
S2O3 S4O6 2- (aq)
Step 2: Align the atoms, with the exception of hydrogen and oxygen.
2S4O6 2-(aq) = S2O3 2-(aq)
Step 3: Add water (H2O) to balance the oxygen atoms.
2S4O6 2- (aq) + H2O = S2O3 2- (aq)
Step 4: Add hydrogen ions (H+) to balance the hydrogen atoms.
2S4O6 2- (aq) + H2O = S2O3 2- (aq) + 4H+ (aq)
Step 5: Add more electrons (e-) to balance the charge.
2S4O6 2- (aq) + H2O = S2O3 2- (aq) + 4H+ (aq) + 2e-
The balanced half-reaction in acidic solution is:
S2O3 2- (aq) + 4H+ (aq) + 2e- → 2S4O6 2- (aq) + H2O
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In Part C of this lab, you will measure the mass, height and diameter of four cylinders composed of some unknown material. Calculate the
volume (in cm³) of a cylinder with a measured height of 11.76 cm and a diameter of 7.22 cm. Type your answer in decimal notation and
include units
The cylinder's volume is roughly 479.85 cm3 at a height of 11.76 cm and a diameter of 7.22 cm.
Is the diameter of a cylinder measured with a vernier caliper?With no zero error, the diameter of a cylinder can be measured with vernier calipers. The Vernier scale's zero is discovered to be between 5.10 cm and 5.15 cm on the main scale. The 50 divisions on the Vernier scale are comparable to 2.45 cm.
V = πr²h
where r is the cylinder's radius, h is its height, and is the mathematical constant pi (approximately equal to 3.14159).
We must first determine the cylinder's radius in order to compute the volume of the cylinder with a height of 11.76 cm and a diameter of 7.22 cm:
r = d/2 = 7.22 cm / 2 = 3.61 cm
Now that the parameters have been entered, we can compute the cylinder's volume:
V = π(3.61 cm)²(11.76 cm)
V = 479.85 cm³
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A nitrogen-containing compound shows no absorption band at ∼3400cm−1 and no absorption bands between ∼1700cm−1 and ∼1600cm−1. what class of compound is it
Explanation:
A nitrogen-containing compound that shows no absorption band at around 3400 cm^−1 and no absorption bands between approximately 1700 cm^−1 and 1600 cm^−1 is likely an amide compound.
Amides typically exhibit a characteristic absorption band in the region of 3200-3500 cm^−1 due to the N-H stretching vibration. The absence of this absorption band suggests the absence of N-H bonds, which rules out compounds like primary or secondary amines.
The absence of absorption bands between 1700 cm^−1 and 1600 cm^−1 eliminates functional groups such as carbonyl compounds (e.g., aldehydes, ketones, carboxylic acids, esters) and imines, which typically exhibit absorption in this region.
Therefore, based on the given information, it can be inferred that the compound is likely not an amine, carbonyl compound, or imine. Other classes of compounds that do not possess these characteristic absorption bands would need to be considered.
An amateur entomologist captures a particularly excellent ladybug specimen in a plastic jar. The internal volume of the jar is 0.5L, and the air within the jar is initially at 1 atın. The bug-lover is so excited by the catch that he squeezes the jar fervently in his sweaty palm, compressing it such that the final pressure within the jar is 1.25 atm. What is the final volume of the ladybug's prison?
The final volume of the ladybug's prison is approximately 0.4 liters.
To determine the final volume of the ladybug's prison, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature. The equation for Boyle's Law is:
P1 * V1 = P2 * V2
Where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume, respectively.
In this scenario, the initial volume (V1) is given as 0.5 L, and the initial pressure (P1) is 1 atm. The final pressure (P2) is 1.25 atm. We need to find the final volume (V2).
Plugging the given values into the equation, we have:
1 atm * 0.5 L = 1.25 atm * V2
Simplifying the equation, we find:
0.5 L = 1.25 atm * V2
Dividing both sides of the equation by 1.25 atm, we get:
0.5 L / 1.25 atm = V2
V2 ≈ 0.4 L
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From what did Oceans form?
Answer:
God
Explanation:
1)Grignard reagent when reacted with methanol will yield A) ethanol (B) secondary alcohols (C) tertiary alcohols (D ropanol (E) primary alcohol
When the reaction of Grignard reagent reacted with methanol will yield a tertiary alcohol. Therefore, Option C tertiary alcohol is correct.
Contains a carbon-metal link, Grignard reagents are chemicals used in catalysis. They generally result from the anhydrous reaction of magnesium metal with an alkyl or aryl halide. Because of their high reactivity, Grignard reagents frequently act as nucleophiles in organic reactions.
An alkyl group from a Grignard reagent binds to the oxygen atom of methanol (CH3OH) when it interacts with the methanol, breaking the carbon-metal connection. A precursor alkoxide is created as a result. The equivalent alcohol is then produced by protonating the intermediate alkoxide.
The reaction of a Grignard reagent with methanol leads to the formation of a tertiary alcohol.
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Convert from moles to molecules or molecules to moles1. How many molecules are in 2.0 moles of hydrogen gas (H2)? 2. How many moles is 2.0 x 1025 particles of silver nitrate? 3. How many atoms of oxygen are in 2.4 x 1023 molecules of copper(II) sulfate?
1. How many molecules are in 2.0 moles of hydrogen gas (H₂)?
There are 6.022 * 10^23 particles in one mol of particles. There are 6.022 * 10^23 molecules of a compound in one mol of molecules of that compound.
We can compare a mol with a dozen. When we want a dozen eggs, we are asking for 12 eggs. When we say a mol of eggs, we want 6.022 * 10^23 eggs.
1 mol of molecules = 6.022 * 10^23 molecules
We will use that relationship to find the answer to our problem.
number of molecules of H₂= 2.0 moles of H₂ * 6.022 * 10^23 molecules of H₂/(1 mol of H₂)
number of molecules of H₂ = 1.2 * 10^24 molecules
Answer: there are 1.2 * 10^24 molecules of hydrogen gas in 2.0 moles of it.
2. How many moles is 2.0 x 10^25 particles of silver nitrate (AgNO₃)?
1 mol of molecules = 6.022 * 10^23 molecules
number of moles of AgNO₃ = 2.0 x 10^25 molecules/(6.022 * 10^23 molecules/mol)
number of moles of AgNO₃ = 33 moles
Answer: there are 33 moles in 2.0 x 10^25 particles of silver nitrate.
3. How many atoms of oxygen are in 2.4 x 10^23 molecules of copper(II) sulfate (CuSO₄)?
The formula of copper (II) sulfate is CuSO₄. So, one molecule of CuSO₄ has 4 atoms of O.
1 molecule of CuSO₄ = 4 atoms of O
We will that relationship to find the answer to our problem.
number of atoms of O = 2.4 * 10^23 molecules of CuSO₄ * 4 atoms of O/(1 molecule of CuSO₄)
number of atoms of O = 9.6 * 10^23 atoms
Answer: there are 9.6 * 10^23 atoms in 2.4 * 10^23 molecules of CuSO₄.
Classify each given species as a strong acid, weak acid, strong base or weak base
KOH, Sr(OH)2, HaPO4, NH3, NaOH, LiOH, HBr, HCl, H2SO4, Ca(OH)2.
Strong base KOH, Sr(OH)2, NaOH, LiOH, Ca(OH)2. Strong acid HBr, HCl, H2SO4. Weak acid H3PO4. Weak base NH3.
KOH - Strong base: KOH is a strong base because it dissociates completely in water to form hydroxide ions (OH-), which are strong bases.Sr(OH)2 - Strong base: Sr(OH)2 is a strong base because it dissociates completely in water to form hydroxide ions (OH-), which are strong bases.H3PO4 - Weak acid: H3PO4 is a weak acid because it only partially dissociates in water to form hydrogen ions (H+) and phosphate ions (PO4^3-).NH3 - Weak base: NH3 is a weak base because it only partially reacts with water to form hydroxide ions (OH-) and ammonium ions (NH4+).NaOH - Strong base: NaOH is a strong base because it dissociates completely in water to form hydroxide ions (OH-), which are strong bases.LiOH - Strong base: LiOH is a strong base because it dissociates completely in water to form hydroxide ions (OH-), which are strong bases.HBr - Strong acid: HBr is a strong acid because it dissociates completely in water to form hydrogen ions (H+) and bromide ions (Br-).HCl - Strong acid: HCl is a strong acid because it dissociates completely in water to form hydrogen ions (H+) and chloride ions (Cl-).H2SO4 - Strong acid: H2SO4 is a strong acid because it dissociates completely in water to form hydrogen ions (H+) and sulfate ions (SO4^2-).Ca(OH)2 - Strong base: Ca(OH)2 is a strong base because it dissociates completely in water to form hydroxide ions (OH-), which are strong bases.To know more about acid please refer:
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A flexible container is filled with He(g) to a volume of V1 at a temperature of 150K. The container is then heated at constant pressure to a temperature of 300K. What is the final volume of the container?
a. V1/3b. V1/2c. V1d. 2V1
Answer:
a but it might also be c
Explanation:
i d k what this is
Answer:
2V1
Explanation:
A runner has a mass of 60 kg and a velocity of 0 m/s. What is her momentum?
Answer:
The answer is 0 kg m/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocity
From the question the momentum of the runner will be 0 kgm/s since the runner's velocity is 0
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Reaction Rates and Chemical Equilibrium: Mastery Test
Select the correct answer from each drop-down menu.
What effect does a decrease in temperature have on the overall rate of a chemical reaction?
The reaction rate will
A decrease in temperature decreases(blank)
The reaction rate will (blank)
Answer:
A decrease in temperature decreases the number of collisions between molecules . The reaction rate will decrease
Explanation:
Layla is helping to clean car parts with a single chemical, but it isn't working. She washes her hands and tries a different chemical, which also does not work. She resumes with the first chemical without washing her hands. This time, the cleaning process works, but she begins to get dizzy and nauseated. What can Layla infer about the possible reason for her illness?
It is an acute effect of two toxins with a synergistic relationship.
It is a chronic effect of the second toxin she used to clean the parts.
The first chemical has an antagonistic relationship with the second.
The second chemical causes acute affects, and the first causes chronic affects.
Layla is helping to clean car parts with a single chemical, but it is not working. She washes her hands and tries a different chemical, which also does not work. She resumes with the first chemical without washing her hands. This time, the cleaning process works, but she begins to get dizzy and nauseated.
The first chemical is possibly toxic and may have caused Layla to become dizzy and nauseated when she resumed cleaning car parts without washing her hands after trying the second chemical. Layla could have accidentally ingested or absorbed some of the first chemical when she touched her mouth or rubbed her eyes while still contaminated with the chemical.A chronic effect is an effect that occurs as a result of exposure to a substance or substances over an extended period. The effect may not become evident until long after the exposure has occurred and may persist even after the exposure has ended. On the other hand, an acute effect is an effect that occurs soon after exposure to a substance or substances and usually lasts for a short period.The symptoms Layla experienced after resuming cleaning car parts with the first chemical are consistent with acute toxicity, which may cause symptoms such as dizziness, nausea, headache, skin irritation, and even death. Therefore, it is possible that the first chemical causes acute effects rather than chronic effects. However, the second chemical, which Layla washed her hands with, may also have toxic effects, but not necessarily acute ones.In conclusion, the fact that Layla experienced symptoms of dizziness and nausea after resuming cleaning car parts with the first chemical without washing her hands indicates that the chemical could be toxic and may have caused acute effects.For such more question on nauseated
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Explain why these ions do not exist under normal condition? a) K^2+b)O^-
First, let's do the electronic distribution of the two ions.
For this, we need the atomic number of both:
K is 19 and O is 8.
K²⁺ loses 2 electrons, so it has 17 electrons.
K²⁺ - 1s² 2s² 2p⁶ 2s² 2p⁵
O⁻ gains 1 electron, so it has 9 electrons.
O⁻ - 1s² 2s² 2p⁵
valence shell
A stable ion must have 8 electrons in the valence shell, just like noble gases. Both ions have 7 electrons in the valence shell, which makes them unstable ions. Therefore, under normal conditions, it is not possible to obtain these ions. Typically, these elements forms this ions:
K⁺ and O²⁻.