Answers
Answer:
7.0
Explanation:
P1V1=P2V2 if temperature and moles are constant, which they appear to be
3.5*2.5=1.25x
x=8.75/1.25
x=7
Related Questions
2. When you transfer energy into a substance, the molecules' kinetic energy
a. Increases
b. Decreases
c. Stay the Same
Answers
When you transfer energy into a substance, the molecules' kinetic energy increases and the correct option is option A.
What is Kinetic energy?Kinetic energy is defined as the energy that is produced by an object due to its motion.
To accelerate an object, we have to apply force. To apply force, we need to do work. When work is done on an object, energy is transferred, and the object moves with a new constant speed. We call the energy that is transferred kinetic energy, and it depends on the mass and speed achieved.
Kinetic energy must always be either zero or a positive value.
Therefore, When you transfer energy into a substance, the molecules' kinetic energy increases and the correct option is option A.
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What is a spontaneous change?
A. One that occurs when one specific event happens.
B. One that occurs on its own.
C. One that has a random arrangement of particles.
D. One that has an ordered arrangement of particles.
Answers
Answer:B. One that occurs on its own
Explanation:
What are the two main properties of matter?
physical and chemical
physical and mechanical
chemical and electrical
mechanical and electrical
Answers
Answer:
physical and chemical.
how did the discoveries of thompson, and rutherford cause daltons model to be modified?
Answers
Thomson's discovery of the electron: Thomson discovered the electron, a negatively charged particle, in 1897, and proposed the "plum pudding" model of the atom. This model showed the atom as a mass of positive charge with electrons randomly scattered throughout it. This discovery challenged Dalton's idea of the atom as an indivisible particle.
Rutherford's gold foil experiment: In 1911, Rutherford conducted the gold foil experiment, in which he bombarded a thin sheet of gold with alpha particles. He found that most of the particles went straight through the foil, but some were deflected at large angles, suggesting that the positive charge in the atom was concentrated in a small central region. This led to the development of Rutherford's atomic model, in which the nucleus of the atom contains most of the positive charge and is surrounded by electrons in orbit.
These discoveries showed that the atom was not as simple as Dalton had thought, and led to the development of more sophisticated models that better explained the structure and behavior of atoms
Question 4
Write a chemical reaction depicting what happens to the sugar in water.
Answers
Answer:
When sugar dissolves,these whole sucrose molecules separate from one another
Liquid water (H_{2}*O) is formed when two gases, hydrogen (H_{2}) and oxygen (O_{2}) , react. Why are the properties of water different than those of the reactant gases?
Answers
Answer
When substances chemically combine, products with completely different properties form
Explanation
The reaction between gaseous hydrogen and oxygen to form water is a chemical change. Hence, when substances (like that of gaseous hydrogen and oxygen) chemically combine, products (water) with completely different properties form.
K + Br2 → KBr
Identify a covalently bonded molecule in the reaction above that is a
REACTANT.
Answers
Answer: A covalently bonded molecule in the reaction
\(K + Br_{2} \rightarrow KBr\) is \(Br_{2}\).
Explanation:
A bond formed by sharing of electrons between two or atoms is called a covalent bond.
For example, bromine is a group 17 element and it has 7 valence electrons. It needs one more electron to complete its octet.
So, when one bromine atom chemically combines with another bromine atom then sharing of electrons takes place which leads to the formation of \(Br_{2}\) molecule.
Hence, in the equation \(K + Br_{2} \rightarrow KBr\); \(Br_{2}\) reactant is a covalently bonded molecule. A covlent bond is formed by two or more non-metal atoms that chemically combine together.
In a chemical equation, reactants are written on the left side and products are written on right side.
Thus, we can conclude that a covalently bonded molecule in the reaction
\(K + Br_{2} \rightarrow KBr\) is \(Br_{2}\).
In this list, which substance can be classified as a chemical?
Answers
Complete Question is attached below
We have that the Chemical is
Salt
From the Question we have options
Salt
Sleep
Sold
Heat
Temperature
Generally among est the options
Salt is the only chemical present as it is made of Sodium and chlorine compound
NaCl joined by an ionic bond
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This is a science subject.
1) You can use what to change liquid into gas?
2) The heating and cooling of molecules will make what change their state?
3) Changing a solid to a liquid to a gas is Changing the what of matter?
Please help me, please, please,.
Answers
Answer:
1)Vaporization of a sample of liquid is a phase transition from the liquid phase to the gas phase. There are two types of vaporization: evaporation and boiling. Evaporation occurs at temperatures below the boiling point, and occurs on the liquid's surface.
2)As a result, state of matter changes from solid to liquid and from liquid to gas. Whereas if there occurs a decrease in temperature then it means kinetic energy of molecules will decrease. ... Thus, we can conclude that the heating and cooling of molecules will make kinetic energy change their state of matter.
3)We can change a solid into a liquid or gas by changing its temperature. This is known as changing its state. Water is a liquid at room temperature, but becomes a solid (called ice) if it is cooled down. The same water turns into a gas (called water vapor) if it is heated up.
The correct answer for the following calculation where 43 and 7 are counted numbers and 2,310 and 0.370 are measured numbers is which of the following? 43 X 2.310 7 X 0.370 a) 38.35 b) 38.4 Oc) 38 O d) 40
Answers
The actual result of the calculation is 101.920. Therefore, none of the options provided in the question matches the correct answer.
To calculate the given expression: (43 × 2.310) + (7 × 0.370), we perform the multiplication first and then add the results.
Multiplying the counted numbers:
43 × 2.310 = 99.330
Multiplying the measured numbers:
7 × 0.370 = 2.590
Now, we add the results:
99.330 + 2.590 = 101.920
The correct answer is not provided in the given options: a) 38.35, b) 38.4, c) 38, or d) 40.
The actual result of the calculation is 101.920. Therefore, none of the options provided in the question matches the correct answer.
It's important to note that when performing calculations, it is crucial to accurately follow the order of operations (multiplication before addition) and ensure precision when dealing with decimal numbers.
In this case, the correct answer is not among the options provided, and the accurate result is 101.920.
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Question 6 (1 point)
Consider the hypothetical equilibrium system below:
A+B+C
What is the equilibrium constant of this system if the initial concentrations of A and
B were each 0.238 M, and the equilibrium concentration of C is 0.072?
Your Answer:
Answers
The equilibrium constant of the system can be obtained as 2.6.
What is the equilibrium constant?We know that we have to obtain the equilibrium constant by setting up the ICE table of the reaction as we can see in the portion below and this is shown as;
A + B ⇆ C
I 0.238 0.238 0
C -x -x +x
E 0.238 - x 0.238 - x 0.072
At equilibrium, we would have;
[A] = 0.238 - 0.072
= 0.166
[B] = 0.238 - 0.072
= 0.166
Then;
K = [C]/[A] [B]
K = [0.072]/(0.166)^2
K = 2.6
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2. (01.01 HC)
Describe the role of consumers in a food web. Are consumers heterotrophs? Justify your answer. (7 points)
Answers
Yes the all types of the consumers are the heterotrophs.
What role play the consumers in a food web? Are consumers heterotrophs?
The consumers play a very important role in the ecosystem of the earth by maintaining the population and growth to the organism of the ecosystem. If we remove the consumer or either the producer then the whole system of the ecosystem will be destabilize, and thus the ecosystem can survive from the overpopulation problem and lack of food problem. The other organism can transfer energy to the consumer.
Both the primary (herbivores) and as well as the secondary (carnivores and omnivores) consumers are heterotrophs.
So we can conclude that yes the all types of the consumers are the heterotrophs.
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A liquid was known to be either methyl alcohol (CH3OH) or ethyl alcohol (CH3CH2OH). The Dumas method for determining molar masses was used to obtain an approximate molar mass, and this value was used to identify the alcohol. The gaseous alcohol at 98oC and 740Torr has a mass of 0.276g in a Dumas bulb of volume equal to 270mL. Which alcohol was present
Answers
Answer:
Methyl alcohol was present.
Explanation:
To solve this problem we use the PV=nRT formula:
P = 740 Torr ⇒ 740/760 = 0.973 atmV = 270 mL ⇒ 270/1000 = 0.270 LT = 98 °C ⇒ 98 + 273.16 = 371.16 KAnd solve for n:
n = PV/(RT)n = 0.973 atm * 0.27 L / (0.082atm·L·mol⁻¹·K⁻¹ * 371.16 K)n = 8.632 x 10⁻³ molNow we divide the mass and the moles to calculate the molar mass:
0.276 g / 8.632 x 10⁻³ mol = 31.97 g/molMethyl alcohol (CH₃OH) has that molar mass.
Isobars are an important feature shown on weather maps. They join up points which have equal values of.
Answers
Isobars are lines that join up points that have equal values of atmospheric pressure.
What are isobars?Isobars are lines that connect locations or points with the same atmospheric pressure on maps. The points are connected with respect to the time or the weekly, monthly, or yearly average of atmospheric pressure.
Isobars on maps play important role in the location of areas with low or high pressure and can inform us about the condition of a place over time as far as the atmospheric pressure is concerned.
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. A sample of crude oil has a density of 0.87 g/mL. What volume (in liters) does a 3.6 kg sample of this oil occupy
Answers
Answer:
The volume is 4.13793 L
Explanation:
Density is a quantity that expresses the relationship between the mass and the volume of a body, so it is defined as the quotient between the mass and the volume of a body:
\(density=\frac{mass}{volume}\)
Density is a characteristic property of every body or substance.
The most commonly used units of density are \(\frac{kg}{m^{3} }\) or \(\frac{g}{cm^{3} }\) for solids, and \(\frac{kg}{L}\) or \(\frac{g}{mL}\) for liquids and gases.
In this case, you know:
density= 0.87 \(\frac{g}{mL}\)mass= 3.6 kg= 3,600 g (being 1 kg=1,000 g)volume= ?Replacing:
\(0.87\frac{g}{mL} =\frac{3,600 g}{volume}\)
Solving:
\(volume =\frac{3,600 g}{0.87\frac{g}{mL}}\)
volume= 4,137.93 mL
Being 1,000 mL=1 L, then volume= 4,137.93 mL= 4.13793 L
The volume is 4.13793 L
Calculate the mass of zinc that reacts with 16.23 g of hydrochloric acid to form 15.2 g of zinc chloride and 18.97 g of hydrogen gas
Answers
Answer:
17.94 g
Explanation:
Discuss four reasons why it is important for a novice entrepreneur to build positive relationships with customers
Answers
Answer:
Networking; Repeat job; Investment; Constructive feedback.
Explanation:
Networking: Word of mouth is a great method to get yourself out there and gain more customers. Consider it free advertising.
Repeat job: Customers who feel they have a good relationship with you will come back, even if it means going out of their way to do so.
Investment: They may invest or offer to invest in your work.
Constructive feedback: Investment is not always financial, it can also be investing their time and knowledge in providing you with valuable feedback and tips.
Positive customer relations help you to connect with your customers more efficiently. It tells you about their requirements, helps you to resolve their problems, and create mutual understanding with them so we can conclude that building positive relationships with customers is very important.
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As wind blows up the windward side, sand grains may be picked up and blown toward the top. Then grains may drop, allowing them to slip down the leeward side. What event is this describing?
1: Desertfication
2: Deposition
3: Dune movement
4: Drought of farmlands
Answers
The event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is Dune movement.
What is Dune movement?
The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee.
If wind hits from above, the sand particles move leeward; the leeward flux of sand is greater than the windward flux.
Thus, the event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is Dune movement.
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if atomic mass of Mg atom is 24g,find the mass of 1 Mg atom
Answers
Answer:
4×10^-23g
Explanation:
Given atomic mass of Mg = 24g
To find mass of 1Mg = ?
So its fix that the atomic mass of Mg 24 g is 6.022×10^23
Then the Atomic mass of 1 Mg atom is = 24 ÷ 6.022×10^23
= 4×10^-23 g
How many grams is 5.00 moles of carbon dioxide?
Answers
Answer:
220.1 grams of CO2.
How many grams of sodium (Na) are in 6.2 mol of Na?
Answers
mass = mol no. x molar mass
= 6.2 x 23
= 142.6 g
What is bonding all about in chemistry?
Answers
Answer:
It is like about a attraction between atoms, molecules, and more.
What are some factors that influence the effectiveness of a chemical sanitizer?
Answers
Chlorine is the most commonly used chemical sanitizer agent and there are so many factors that influences the effectiveness of these chemical sanitizers like- Temperature, Concentration, Contact time, Water Hardness, pH but bacterial cell history does not affect the efficiency of sanitizers.
Factors influencing the effectiveness of chemical sanitizer:
Temperature: Temperature for the sanitizer should lie between 75°F and 120°F to work properly. At the higher temperatures, chlorine compounds may cause corrosion to some metal items. Concentration: If concentration of sanitizing agent is too high, it will be toxic and lower concentration result in an inadequate reduction of microorganismsContact time: If the contact time of sanitizer is too long, it evaporates before achieving the desired disinfection.Water hardness: Hard Water reduces the effectiveness of sanitizer.pH: With raise in pH, chlorine becomes less effective as a sanitizer.To know more about Sanitizers:
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A 30. 5 gram sample of glucose (c6h12o6), mm~180 g/mol) contains __________ atoms of carbon.
Answers
A 30.5 gram sample of glucose contains 6.1×10²³ atoms of carbon.
Firstly we will calculate the number of moles and then use Avogadro's constant to find the number of atoms.
So, the number of moles of glucose will be calculated by the formula -
Number of moles = mass ÷ molar mass
Number of moles = 30.5/180
Performing division on Right Hand Side of the equation
Number of moles = 0.169 moles
As we know, one mole of any molecule contains Avogadro's number of atoms.
So, 0.169 moles of glucose will contain 6.02×10²³ atoms
Now, 1 mole of glucose will contain 6 carbon atoms. Thus, number of carbon atoms = 6.02×10²³×6×0.169
Number of carbon atoms = 6.1×10²³
Thus, there are 6.1×10²³ atoms.
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Stephan’s mother cuts a twig from a rose bush and plants it in the soil. After a few days, Stephan observes a new plant growing. Which characteristic does the growth of the new plant depict?
Answers
The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.
Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.
The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.
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What is the product of the reaction?
Please answer with the correct answer! Thanks.
Answers
Answer:
compound
Explanation:
it is calcium oxide, also known as quicklime
show workHow many grams of aluminum will react with 3.4 moles of chlorine?
Answers
ANSWER
STEP-BY-STEP EXPLANATION:
Given information
The number of moles of chlorine = 3.4 moles
Step 1: write a balanced equation of aluminum and chlorine
\(2Al+3Cl_2\rightarrow2AlCl_3\)Step 2: Find the number of moles of aluminum using a stoichiometry ratio
From the above reaction, you will see that 2 moles of aluminum react with 3 moles of chlorine to give 3 moles of aluminum chloride.
Let x represents the number of aluminum
\(undefined\)Which sample contains the largest number of oxygen atoms? Select one: a. 8.0 g of carbon dioxide b. 8.0 g of potassium chlorate c. 8.0 g of calcium perchlorate d. 8.0 g of sodium hydroxide
Answers
The sample with the largest number of oxygen atoms will be calcium perchlorate.
Number of atoms in a compoundSince we are not looking at the number of moles, the mass of the compounds has no bearing on the number of atoms of oxygen.
The chemical formula for carbon dioxide is \(CO_2\). Thus, it has 2 atoms of oxygen.The chemical formula for potassium chlorate is \(KClO_3\). Thus, it has 3 oxygen atoms.The chemical formula for calcium perchlorate is \(Ca(ClO_4)_2\). Thus, it has 8 atoms of oxygen.The chemical formula for sodium hydroxide is NaOH. Thus, it has 1 atom of oxygen.Therefore, the compound with the largest number of oxygen atoms is calcium perchlorate.
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Chlorine monoxide accumulates in the stratosphere above Antarctica each winter and plays a key role in the formation of the ozone
hole above the South Pole each spring. Eventually, CIO decomposes according to the equation:
2ClO(g) -> Cl ₂(g) + O₂(g)
The second-order rate constant for the decomposition of CIO is 7.98x10^9M-¹s¹ at a particular temperature. Determine the half-life of CIO when its initial concentration is 1.46x10^-8 M.
Answers
The half life of the reaction is 0.0087 s.
What is the half life?The half-life is the amount of time it takes for half of a substance (such as a radioactive isotope or a drug) to decay, disappear, or be reduced by half. In pharmacology, the half-life of a drug is the time it takes for the concentration of the drug in the body to be reduced by half.
The half-life of a substance is a useful metric for understanding its behavior over time and is used in many fields, including chemistry, biology, and physics.
We know that;
t1/2 = 1/k[A]o
t1/2 = half life
k = rate constant
[A]o = initial concentration
t1/2 = 1/7.98x10^9 * 1.46x10^-8
t1/2 = 0.0087 s
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Vehicle air bags require that a very specific amount of gas is created so that the gas inflates the airbag without causing it to rupture.
Commonly, this is accomplished by decomposing sodium azide (NaN3) to produce sodium metal and nitrogen gas. How much sodium azide is required to produce 80.0 g of nitrogen gas?
Answers
The amount of sodium azide required will be 123.72 grams
Stoichiometric problemFrom the equation of the reaction below:
\(2NaN_3 --- > 2Na + 3N_2\)
The mole ratio of sodium azide to nitrogen gas is 2:3
Mole of 80.0 g nitrogen = 80/28.02 = 2.855 moles
Equivalent mole of sodium azide = 2/3 x 2.855 = 1.903 moles
Mass of 1.903 moles sodium azide = 1.903 x 65 = 123.72 grams
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