Directions: Perform the Assessment in Module 7 because that will serve as your Performance Task for Module 5, 6 & 7. Kindly read the rubric for you to be guided on how your output will be graded. Do not forget to submit your output to your teacher. Enjoy!
please answer nyo to nang maayos please
Answers
please put your question completely....
Related Questions
1. Iron-59 has a half-life of 6 days. How much of a 1000g sample will be left after 42 days?
Answers
Answer:
7.8125 g
Explanation:
42/6 = 7 half-lives
Original: 1000 g
1st half-life: 500 g
2nd half-life: 250 g
3rd half-life: 125 g
4th half-life: 62.5 g
5th half-life: 31.25 g
6th half-life: 15.625 g
7th half-life: 7.8125 g
Max Points, 4 Parts,
1. explain to John Dalton what his Solid Sphere Model got correct, and what it got incorrect
2. explain to Dmitri Mendeleev what his periodic table got correct, and what it got incorrect
3. explain to Ernest Rutherford what Niels Bohr's model of the atom would eventually improve compared to his own Nuclear Model
4. Isaac Newton was actually an avid alchemist (popular with the learned thinkers in the 17th century). He began studying chemistry but eventually grew bored of it for the perceived excitement of alchemy. In 1-2 paragraphs, convince Isaac Newton to toss aside his alchemy fixation for true chemistry
Answers
The assumption that an atom is indestructible is refuted by the fact that it can be further split into protons, neutrons, and electrons.
However, an atom is the smallest particle involved in chemical reactions. According to Dalton, every aspect of an element's atoms is the same.
The atom is the smallest unit of matter that may be divided without generating particles with an electrical charge. It is also the smallest material with properties resembling chemical elements. As a result, the atom acts as the basic building block of chemistry. Examine various electron configurations in the electron shells that enclose the atomic nucleus of an atom.
Examine various electron configurations in the electron shells that enclose the atomic nucleus of an atom. An atom is primarily made of space. The rest is made up of a positively charged nucleus made up of protons and neutrons that is surrounded by a cloud of negatively charged electrons. The nucleus is small and dense in comparison to electrons, which are the lightest charged particles in nature.
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How do solids, liquids, and gases differ? in solid matter, atoms or molecules pack close to each other in fixed locations; in gases, atoms or molecules pack about as closely as they do in solid matter, but they are free to move; in liquid matter, atoms or molecules have a lot of space between them and are free to move a solid has a fixed volume and rigid shape; liquids assume the shape of their container; gases always assume the shape and volume of their container in solid matter, atoms or molecules pack close to each other but, they are free to move; in liquid matter, atoms or molecules pack about as closely as they do in solid matter, they are also free to move; in gaseous matter, atoms or molecules have a lot of space between them and are free to move relative to one another a solid has a fixed volume and rigid shape; gases assume the shape of their container; liquids always assume the shape and volume of their container
Answers
in solid matter, atoms or molecules pack close to each other in fixed locations; in gases, atoms or molecules pack about as closely as they do in solid matter, but they are free to move;
What frequency corresponds to an absorption line at 527 nm? A. 5.69 x 1014 Hz B. 3.77 x 10¹4 Hz C. 1.76 x 10¹4 Hz D. 6.71 10¹4 Hz
Answers
Taking into account the definition of wavelength, frecuency and propagation speed, the correct answer is option A.: The frequency corresponding to an absorption line at 527 nm is 5.69×10¹⁴ Hz
WavelengthWavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).
FrequencyFrequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).
Propagation speedThe propagation speed is the speed with which the wave propagates in the medium.
The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:
v = f×λ
All electromagnetic waves propagate in a vacuum at a constant speed of 3×10⁸ m/s, the speed of light.
Frequency in this caseIn this case, you know:
v= 3×10⁸ m/sf= ?λ= 527 nm= 527×10⁻⁹ m (1 nm= 1×10⁻⁹ m)Replacing in the definition of propagation speed:
3×10⁸ m/s= f× 527×10⁻⁹ m
Solving:
f= 3×10⁸ m/s ÷ 527×10⁻⁹ m
f= 5.69×10¹⁴ Hz
In summary, the correct answer is option A.: The frequency corresponding to an absorption line at 527 nm is 5.69×10¹⁴ Hz
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Anna is conducting an experiment how rather affects cell phone reception. Which of the following is the best answer
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Answer:
You did not provide any details about the experiment, nor provided any answers for us from which to choose "the best answer" from. Please refine your question next time.
Explanation:
How many single covalent bonds can carbon form?
o A. 1
O B. 2
O C.3
O D. 4
Answers
Carbon contains four electrons in its outer shell
how does a constructive relationship influence your well being
Answers
Answer:
how does a constructive relationship influence your well being
Explanation:
Constructive and deconstructive relationships can influence the well being of different people in different ways. From the point of view who value relationships, dealing with one who repeatedly ruins it is stressful, it slowly damages the health and will continue to do so unless the individual separates himself or herself from the one causing the pain.
12. What are the 2 types of stability and how do they relate to the parts of the atom?
Answers
An atom is stable when its total charge is equal to 0 (zero).
There are 2 situacions that can make an atom not stable (or its total charge is not zero):
1. One situation is that the atom has excess of negative charge. In this case, the atom is stabilized by transferring valence electrons to another atom.
2. Another situation is that the atom has excess of positive charge. In this case, the atom is stabilized by obtaining electrons from another atom.
In both cases, the parts of the atom related to the stable state are the electrons.
Net ionic equation for potassium sulfide and magnesium iodide
Answers
The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.
To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.
Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):
K2S -> 2K+ + S2-
Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):
MgI2 -> Mg2+ + 2I-
Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):
K+ + I- -> KI
Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):
Mg2+ + S2- -> MgS
Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:
2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS
To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).
Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:
S2- + Mg2+ -> MgS
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What causes heat energy when you rub two objects against each other? (2 points)
Group of answer choices
The air around the objects
The flow of heat from one object to the other
The friction between the two objects
The pull of gravity on the two objects
Answers
Make the arbitrary assignment of the reduction of Zn2+(aq) to Zn(s) as you 0 V for your brief list.
Zn^2+(aq) +2e- → Zn(s) E = 0 V
Answers
The arbitrary assignment of the reduction of Zn2+(aq) to Zn(s) as E = 0 V serves as a reference point for determining the relative reduction potentials of other redox reactions. This assignment is based on the convention that the standard reduction potential
In the case of the Zn2+(aq) to Zn(s) reduction, the reaction involves the gain of two electrons by Zn2+ ions, leading to the formation of solid zinc metal. The assigned reduction potential of 0 V indicates that, under standard conditions (1 M concentration, 25°C, and 1 atm pressure), the Zn2+ ions have a tendency to accept electrons and be reduced to Zn metal.
Any reduction potential above 0 V suggests a greater tendency for reduction, while a negative reduction potential indicates a lower tendency for reduction compared to the Zn2+(aq) to Zn(s) reaction.
This reference potential allows us to compare the reactivity of other redox systems and predict the feasibility of different reactions. The more positive the reduction potential, the greater the tendency for reduction to occur. Therefore, if we encounter a reduction potential of +0.34 V for another reaction, we can infer that it is more likely to occur spontaneously compared to the Zn2+(aq) to Zn(s) reduction. Conversely, if we encounter a reduction potential of -0.50 V, we can conclude that the reverse reaction (oxidation) is more favorable than the reduction of Zn2+(aq) to Zn(s).
Overall, the assignment of E = 0 V for the reduction of Zn2+(aq) to Zn(s) provides a benchmark for understanding the electrochemical behavior of other redox reactions and allows us to make predictions based on the relative reduction potentials.
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At a temperature of 11.5 °C the gas occupies a volume of 0.0141 m³. Calculate the volume the gas occupies when the temperature is raised to 95.0 °C.
Answers
Taking into account the Charles's law, the gas occupies a volume of 0.0182 m³ when the temperature is raised to 95.0 °C.
Charles's lawCharles's law shows the relationship between the volume and temperature of a gas sample at constant pressure.
This law states that the volume is directly proportional to the temperature of the gas: if the temperature increases, the volume of the gas increases, while if the temperature of the gas decreases, the volume decreases.
Mathematically, Charles' law is a law that says that when the amount of gas and pressure remain constant, the ratio between volume and temperature will always have the same value:
\(\frac{V}{T}= k\)
Considering an initial state 1 and an initial state 2:
\(\frac{V1}{T1}= \frac{V2}{T2}\)
Volume in this caseIn this case, you know:
V1= 0.0141 m³T1= 11.5 C= 284.5 K (being 0 C= 273 K)V2= ?T2= 95 C= 368 KReplacing in Charles's Law:
\(\frac{0.0141 m^{3} }{284.5 K}=\frac{V2}{368 K}\)
Solving:
\(\frac{0.0141 m^{3} }{284.5 K}x368 K=V2\)
0.0182 m³= V2
Finally, the gas occupies a volume of 0.0182 m³ when the temperature is raised to 95.0 °C.
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Maalox is the trade name for an antacid and antigas medication used for relief of heartburn, bloating, and acid indigestion. Each 4−mL portion of Maalox contains 320 mg of aluminum hydroxide, 320 mg of magnesium hydroxide, and 32 mg of simethicone. If the recommended dose is two teaspoons four times a day, how many grams of each substance would an individual take in a 12−hour period. (1 teaspoon = 5 mL.)
Answers
Maalox is the trade name for an antacid and antigas medication used for relief of heartburn, bloating, and acid indigestion in which
4 ml contains
= 320mg of aluminum hydroxide
= 320mg of magnesium hydroxide
= 32mg of simethicone
recommended doses = 4 times * 2 tea spoon = 8 tea spoon/ day
given = 1 tea spoon = 5 ml
8 tea spoon = 40 ml
hence,
amount of aluminum hydroxide = 320/4 * 40 = 3200mg = 3.2 g
amount of magnesium hydroxide = 320/4 * 40 = 3.2 g
amount of simethicone = 32/4 * 40 = 320 mg = 0.32g
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Answer it explaination?
Answers
Answer:
22 b
Explanation:
that us the math
In a titration experiment 43.18 mL of 0.283 M KOH is reacted with H2SO4. The endpoint is reached when 44.62 mL of the acid is mixed with the base. What is the molar concentration of the acid?
Answers
The balanced formula of the reaction described is:
\(2KOH_{(aq)}+H_2SO_{4(aq)}→K_2SO_{4(aq)}+2H_2O_{(l)}\)To find the molar concentration (Molarity) of the solution we will follow the following steps:
1. We find the moles of KOH present in the basic solution using the molarity equation that tells us:
\(Molarity=\frac{MolesSolute}{Lsolution}\)\(\begin{gathered} MolesSolute=Molarity\times Lsolution \\ MolesSolute=0.283M\times0.04318L \\ MolesSolute=0.012molKOH \end{gathered}\)2. From the stoichiometry of the reaction we find the moles of H2SO4 needed to neutralize the moles of KOH. The ratio H2SO4 to KOH is 1/2.
\(\begin{gathered} molH_2SO_4=givenmolKOH\times\frac{1molH_2SO_4}{2molKOH} \\ molH_2SO_4=0.012molKOH\times\frac{1molH_{2}SO_{4}}{2molKOH}=0.006molH_2SO_4 \end{gathered}\)3. We find the molarity of the solution using the molarity formulation from point 1.
\(\begin{gathered} Molarity=\frac{MolesSolute}{Lsolution} \\ Molarity=\frac{0.006molH_2SO_4}{0.04462L}=0.137M \end{gathered}\)Answer: The molarity or molar concentration of the acid solution is 0.137M
4. A steel ball has a diameter of 0.750 cm and weighs 1.765 g. What is its density in grams
per cubic centimeter?
Answers
Taking into account the definition of density, the density of the steel ball is 7.99 g/cm³.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷volume
Density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Density in this caseIn this case, you know that:
Mass= 1.765 gDiameter of steel ball= 0.750 cmRadius of a steel ball= diameter of steel ball÷2= 0.375 cmVolume of a steel ball= Volume of a sphere= 4/3×π×r³= 4/3×π×(0.375 cm)³= 0.2209 cm³Replacing in the definition of density:
density= 1.765 g÷0.2209 cm³
Solving:
density= 7.99 g/cm³
In summary, the density of the steel ball is 7.99 g/cm³.
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what mass (g) of CaF2 is formed when 47.8mL of 0.334 M NaF is treated with an excess of aqueous calcium nitrate? what type of reaction is this?
Answers
The mass of CaF₂ formed when 47.8 mL of 0.334 M NaF is treated with an excess of aqueous calcium nitrate, Ca(NO₃)₂ is 0.624 g
We'll begin by calculating the number of mole of NaF in the solution. This can be obtained as follow:
Volume = 47.8 mL = 47.8 / 1000 = 0.0478 L
Molarity of NaF = 0.334 M
Mole of NaF =?Mole = Molarity x Volume
Mole of NaF = 0.334 × 0.0478
Mole of NaF = 0.016 mole Next, we shall determine the number of mole of CaF produced from the reaction.2NaF + Ca(NO₃)₂ —> CaF₂ + 2NaNO₃
NOTE: This is a double displacement reaction.
From the balanced equation above,
2 moles of NaF reacted to produce 1 mole of CaF₂.
Therefore,
0.016 mole of NaF will react to produce = 0.016 / 2 = 0.008 mole of CaF₂.
Finally, we shall determine the mass of 0.008 mole of CaF₂.Mole of CaF₂ = 0.008 mole
Molar mass of CaF₂ = 40 + (19×2) = 78 g/mol
Mass of CaF₂ =?Mass = mole × molar mass
Mass of CaF₂ = 0.008 × 78
Mass of CaF₂ = 0.624 gTherefore, the mass of CaF₂ formed when 47.8mL of 0.334 M NaF is treated with an excess of aqueous calcium nitrate, Ca(NO₃)₂ is 0.624 g
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Answer:
0.623
Explanation:
Which element has chemical properties most similar to sodium? a. magnesium b. oxygen c. phosphorus d. rubidium
Answers
The element that has chemical properties most similar to sodium is d. rubidium.
What is rubidium?
Rubidium is in the same group (group 1) as sodium in the periodic table and has similar chemical properties, such as reactivity with water and the tendency to form ionic compounds with halogens. Magnesium, oxygen, and phosphorus are not in the same group as sodium and have different chemical properties.
What is periodic table?
The periodic table is a tabular display of all known chemical elements, arranged according to their atomic structure and properties. It is arranged in rows and columns, with elements placed in order of increasing atomic number, which is the number of protons in an atom's nucleus. The periodic table is a powerful tool for predicting the chemical behavior of elements and for understanding the relationships between different elements. It is used extensively in chemistry, physics, and other sciences to help understand the properties and behavior of different elements, and to guide research and development in many different fields.
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Part A
A sample of ideal gas is in a sealed container. The pressure of the gas is 735 torr, and
the temperature is 29 °C. If the temperature changes to 62 °C with no change in
volume or amount of gas, what is the new pressure, P2, of the gas inside the container?
Express your answer with the appropriate units.
View Available Hint(s)
HÅ
P₂ = Value
Submit
O
Units
?
Answers
Pressure of the gas inside the container is 662.59 torr.
What is ideal gas law?The ideal gas law (PV = nRT) connects the macroscopic characteristics of ideal gases. An ideal gas is one in which the particles are both non-repellent and non-attractive to one another (have no volume).
The general law of ideal gas can be applied here: PV is equal to nRT, where P is the gas pressure in atm.
V is the number of moles of the gas in a mole, and n is the volume of the gas in L. R is the universal gas constant. T is the temperature(Kelvin) of the gas.
If P and T are different values and n and V are constants, then
(P₁T₂) = (P₂T₁).
P₁ = 735 torr, T₁ = 29°C + 273 = 302 K,
P₂ = ??? torr, T₂ = 62°C + 273 = 335 K.
∴ P₂ = (P₁T₂)/(P₁) = (735 torr)(302 K)/(335 K) = 662.59 torr.
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Which equation shows an increase in entropy?
Hint: Look at the states of matter, g s l, of the chemicals in each equation. A C2H4(g) + H2(g) + C2H6(g) в Caco3(9) + Cao(s) - CO2(g) c Fe(s) + S (s) -+ FeS (s)
Answers
The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A
In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).
When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.
Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.
In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.
The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A
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How many moles of H2O are found in a sample containing 7.1 * 10 (19) molecules
Answers
The sample containing 7.1 × 10^19 molecules of H2O corresponds to approximately 1.18 × 10^(-4) moles of H2O.
To determine the number of moles of H2O in a sample containing 7.1 × 10^19 molecules, we need to use Avogadro's number, which states that 1 mole of any substance contains 6.022 × 10^23 molecules.
Given that there are 7.1 × 10^19 molecules of H2O in the sample, we can calculate the number of moles using the following formula:
Moles = Number of molecules / Avogadro's number
Moles = 7.1 × 10^19 / 6.022 × 10^23
Moles ≈ 1.18 × 10^(-4) moles
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when 1.00g of magnesium is reacted with excess hydrochloric acid, what volume of hydrogen gas will be produced at standard temperature and pressure? statndard temperature and pressure is defined as 0 C and 1 atm. At STP, 1 mole of gas occupies 22.4L.
Answers
Answer:
0.93L
Explanation:
Hello,
To solve this question, we need to first of all write down the equation of reaction.
Equation of reaction,
2Mg + 4HCl → 2MgCl₂ + 2H₂
From the equation of reaction, it shows that 2 moles of Mg produces 2 moles of H₂.
Number of moles = mass / molar mass
Mass = number of moles × molar mass
Molar mass of Mg = 24g/mol
Mass = 2 × 24 = 48g
Therefore, 48g of Mg produces (2 × 22.4)L of H₂
48g of Mg = 44.8L of H₂
1g of Mg = xL of H₂
x = (1 × 44.8) / 48
x = 0.93L
1g of Mg will produce 0.93L of H₂
The 4-4-9 system is used to estimate the number of _______ in food. Question 9 options: A) kilojoules B) calories C) joules D) nutritional Calories
Answers
Answer: B) calories
Explanation:
The 4-4-9 system is used to estimate the number of calories in food. Under this system, it is assumed that one gram of Protein, one gram of Carbohydrates and one gram of Fats each contribute 4, 4 and 9 calories respectively to the caloric total.
This means that to find out the number of calories in food, multiply the total grams of proteins by 4, the total grams of carbohydrates by 4 and the total grams of Fats by 9 and then add up the results to find out the caloric contribution of Protein, Carbohydrates and Fats.
Answer:
It's not C calories i put that and missed it
Explanation:
Why do both nuclear and chemical
changes occur?
Answers
Answer:
The change in energy for a chemical reaction has to do with the potential energy of the electrons. The change in energy for a nuclear reaction has to do with the potential energy of the nucleus. The change in energy for a nuclear change is many orders of magnitude larger than for a chemical change.
The statement that describes both nuclear and chemical changes occur is "potential energy."
What is nuclear and chemical reaction?Nuclear reactions include a change in the nucleus of an atom, which usually results in the production of a different element. Chemical reactions, on the other hand, require just electron rearrangement and no changes in nuclei.
A nuclear reaction is any reaction that causes the nucleus of an atom to change. An atom's nucleus is made up of protons and neutrons. It seems to reason that a nuclear reaction alters the amount of protons and/or neutrons in an atom.
Chemical changes occur when bonds between molecules or atoms are broken and/or formed to form a new material. In this case, the new substances' qualities differ from the old, the particles differ, and the number of particles can alter.
The change in energy for a nuclear change is many orders of magnitude greater than the change in energy for a chemical change.
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The volume of a gas is directly proportional to its temperature (in Kelvin) at constant
pressure. What does this mean?
As one increases, the other will increase at the same rate. The graph will show a
straight line.
As one increases, the other will decrease at the same rate. The graph will show a
straight line.
As one increases, the other will decrease at the same rate. The graph will show a
inverse line.
As one increases, the other will increase at the same rate. The graph will show an
inverse line.
Answers
Answer: A
Explanation:
As one increases the other goes in a straight line. It is called a direct proportionality. Forms a linear graph.
A student sets up the following equation...
Answers
Answer:
The answer to your question is given below
Explanation:
From the question given above, the following data were obtained:
Concentration (g/mL) = 0.04 g/mL
Concentration (g/L) =?
We can convert g/mL to g/L by doing the following:
1 g/mL = 1000 g/L
Therefore,
0.04 g/mL = 0.04 g/mL × 1000 g/L / 1 g/mL
0.04 g/mL = 40 g/L
0.04 g/mL is equivalent to 40 g/L.
Thus, the concentration (g/L) is 40 g/L
gold is used for making ornaments give reason
Answers
Answer:
Because looks good for a Christmas tree.
Explanation:
Gold ornaments look pretty shiny and cool to look at.
Hope I helped!
In a chemical reaction, a catalyst changes the ______.
Select one:
a.
heat of reaction
b.
activation energy of the reaction
c.
potential energy of the products
d.
potential energy of the reactants
Answers
Answer:
The Correct answer is B
activation energy of the reaction
or
speeds up the reaction
On the planet Pluto, the average night temperature is 13K. What is this temperature in
degrees Celsius and degrees Fahrenheit?
Answers
Answer:
-260.15 degrees Celsius.436.27 degrees Fahrenheit.Explanation:
What is the name of the compound N2O3?Trinitrogen dioxideTrinitrogen dioxygenDinitrogen trioxideDinitrogen trioxygen
Answers
Dinitrogen trioxide
Explanations;From the given question, we are to name the compound N2O3. From the given compound, you can see that there are 3 atoms of oxygen and 2 atoms of hydrogen.
Hence the name of the given compound is Dinitrogen trioxide