d. The mass of the reactants and products is equal and is not dependent on the physical state of the substances explains the correct statement about the law of conservation of mass.
The law of conservation of mass is the law that states that matter or energy can neither be created nor destroyed. This means that the amount of matter in the universe is always the same. The law of conservation of mass is a fundamental law of physics and it is always obeyed by all physical processes.
The amount of matter in a closed system (one that is not subject to outside influences) will remain constant over time.
It is always obeyed even under the most extreme conditions, such as during nuclear reactions.
Hence, the correct option is d.
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If the initial concentration of a 400 ml solution is 7% and the solution is diluted down to a concentration of 4.5%, what will the new volume of the solution be?
We have that the dilution equation of concentrated solutions will be equal to:
[tex]C_1V_1=C_2V_2[/tex]where,
C1 is the initial concentration of the solution = 7%
V1 is the initial volume = 400mL
C2 is the final concentration = 4.5%
V2 is the final volume = ?
We clear Ve and replace the known data:
[tex]\begin{gathered} V_2=\frac{C_1V_1}{C_2} \\ V_2=\frac{7\%\times400mL}{4.5\%}=622mL \end{gathered}[/tex]Answer: the new volume of the solution will be 622 mL
Given the following unbalanced equation: K+Cl2 -> KClHow many moles of KCl are produced from 2.50 moles K?
1) Balance the chemical equation
[tex]2K+Cl_2\rightarrow2KCl[/tex]2) Moles of KCl produced from 2.50 mol K.
The molar ratio between KCl and K is 2 mol KCl: 2 mol K.
[tex]_{}molKCl=2.50molK\cdot\frac{2molKCl_{}}{2molK_{}}_{}=2.50molKCl_{}[/tex]2.50 mol K will poroduce 2.50 mol KCl.
.
In lecture, the professor names a molecule 4-ethylpentane. An alert student pointed out that although the correct structure could be drawn, the name did not follow systematic rules. What is the correct systematic name for the molecule?
Answer
C. 3-methylhexane.
Explanation
In a systematic system of naming organic molecules, te longest chain wof carbon ill be considrered first.
So the longest chain of carbon in the molecule will be 6 (hexane) and not 5 (pentane).
The parent name of the molecule will be hexane.
The only methyl group left is bonded to carbon 3 (numbering in such a way the methyl group s given the least number possible).
Therefore, the correct name of the molecule is 3-methylhexane.
The answer is C. 3-methylhexane.
The molecule below contains both an aldehyde and a ketone functional group. Circle only the carbonyl carbon atom of the aldehyde functional group.
Let's look at the aldehyde. We must look for a similar structure for your task.
Circle the carbon on the right.
Lakeshea analyzed 6.234 grams of a substance and found it to be composed of 4.980 g of carbon and 1.254 g of hydrogen. In the next lab group, Niles analyzed another sample of the same substance and found 4.004 g of carbon.
A) How much hydrogen did Niles find in his sample
B) What is the justification(what law: Conservation of mass, Definite Proportions, Multiple Proportions) for your answer?
Lakeshea analyzed 6.234 grams of a substance and found it to be composed of 4.980 g of carbon and 1.254 g of hydrogen. Niles analyzes another sample of the same substance containing 4.004 g of carbon. A) hydrogen did Niles find in his sample is 2.23 g. B) The justification is the law of conservation of mass.
According to the law of mass of conservation of mass : mass neither be created nor be destroyed. so, that if sample is of 6.234 g contain 4.980 g carbon and 1.254 g hydrogen then the same sample if contain 4.004 g of carbon then the hydrogen will be 2.23 g of hydrogen.
Thus, Lakeshea analyzed 6.234 grams of a substance and found it to be composed of 4.980 g of carbon and 1.254 g of hydrogen. Niles analyzes another sample of the same substance , containing 4.004 g of carbon. A) hydrogen did Niles find in his sample is 2.23 g. B) The justification is the law of conservation of mass.
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Why wouldn’t an electrolyte conduct electricity in the solid form?
Answer
When the electrolyte is in solid state, electrons are tightly bound to the atoms and are not easily available to flow. So, they do not conduct electricity well.
Calculate the molarity of a solution that is made of 75 g NaCl in 1.0 L of water
Answer
Molarity = 1.28 mol/L
Explanation
Given:
Mass of NaCl = 75 g
Volume of water = 1.0 L
What to find:
The molarity of the solution.
Step-by-step solution:
The molarity of the solution can be calculated using the molarity formula given below:
[tex]Molarity=\frac{Mole}{Volume\text{ }in\text{ }L}[/tex]However, you need to convert the mass of NaCl given to moles using the mole formula; Mass divided by molar mass.
The molar mass of NaCl = 58.44 g/mol
[tex]Mole=\frac{Mass}{Molarmass}=\frac{75\text{ }g}{58.44\text{ }g\text{/}mol}=1.283367556\text{ }mol[/tex]Now, the molarity is
[tex]Molarity=\frac{1.283367556\text{ }mol}{1.0\text{ }L}=1.283367556\text{ }mol\text{/}L\approx1.28\text{ }mol\text{/}L[/tex]Hence, the molarity of the solution is 1.28 mol/L
A 10 L cylinder of gas is stored at room temperature (25 Celsius) and a pressure of 1800 psi. if the gas is transferred to a 6.0 L cylinder, at what temperature would it have to be stored in order for the pressure to remain at 1800 psi?
Since we want the pressure to remain constant we have to use Charles Law of gases, that relates the volume and the temperature at a constant pressure:
[tex]\frac{V1}{T1}=\frac{V2}{T2}[/tex]In this case, we know the values of V1, T1 and V2, which are 10L, 25°C and 6.0L. Using these values we have to find T2:
[tex]\begin{gathered} T2=\frac{V2\cdot T1}{V1} \\ T2=\frac{6.0L\cdot25}{10L} \\ T2=15 \end{gathered}[/tex]The gas has to be stored at 15°C.
What volume of hydrogen gas is evolved from a reaction between 0.52 g of Na and water? The gas is collected at 25°C and 740 mmHg.___ Na (s) + ___ H2O (l) → ___NaOH (aq) + ___ H2 (g)
0.284L
ExplanationsThe balanced chemical reaction between sodium and water is expressed as:
[tex]2Na(s)+2H_2O(l)\rightarrow2NaOH(aq)+H_2(g)[/tex]Determine the moles of sodium Na that reacted
[tex]\begin{gathered} moles\text{ of Na}=\frac{mass}{molar\text{ mass}} \\ moles\text{ of Na}=\frac{0.52}{23} \\ moles\text{ of Na}=0.0226moles \end{gathered}[/tex]Based on stoichiometry, 2moles of sodium produces 1 mole of hydrogen gas. The moles of hydrogen gas required is given as:
[tex]\begin{gathered} mole\text{ of H}_2=\frac{1}{2}\times0.0226 \\ mole\text{ of H}_2=0.0113moles \end{gathered}[/tex]According to the ideal gas equation
[tex]\begin{gathered} PV=nRT \\ V=\frac{nRT}{P} \end{gathered}[/tex]Given the following
P = 740mmHg = 0.974atm
T = 25 +273 = 298K
R = 0.08205 Latm/molK (Gas constant)
Substitute the given parameters into the formula to have:
[tex]\begin{gathered} V=\frac{0.0113\times0.08205\times298}{0.974} \\ V=\frac{0.2764}{0.974} \\ V=0.284L \end{gathered}[/tex]Hence the volume of hydrogen gas that evolved from the reaction is 0.284L
What is the average mass, in grams, of one atom of niobium? (NA = 6.022 × 1023 mol–1)
1) List known data
NA = 6.022*10^23
List unknown data
Mass in grams:
Molar mass: 92.906 g/mol
2) Find out the mass
[tex]gramsof1atomofNiobium=92.906\frac{g}{\text{mol}}\cdot\frac{1\text{mol of niobium}}{6.022\cdot10^{23}\text{atoms of niobium}}=1.543\cdot10^{-22}g[/tex]One atom of niobium weighs 1.543*10^-22 g
convert 8 mol Na to grams
184g
Explanations:The formula for calculating the mass of a substance is expressed as;
[tex]moles=mass\times molar\text{ mass}[/tex]Given the following parameters
• Moles of Na = 8moles
,• Molar mass of Na = 23g/mol
Substitute the given parameter into the formula
[tex]\begin{gathered} Mass\text{ of Na}=moles\times molar\text{ mass} \\ Mass\text{ }of\text{ Na}=8moles\times\frac{23g}{mol} \\ Mass\text{ of Na}=184g \end{gathered}[/tex]Hence the mass of the sodium is 184g
1. from the mass of copper measured 51.226 , determine the moles of Cu
To determine the moles of copper we must use its atomic weight. This value can be found in the periodic table. The atomic weight of copper is 63.546g/mol, so the moles of copper will be:
[tex]\begin{gathered} \text{Moles Cu= Given g of Cu }\times\frac{1molCu}{Atomic\text{ weight Cu, gCu}} \\ \text{Moles Cu=51.226gCu}\times\frac{1molCu}{63.546\text{gCu}}=0.806 \end{gathered}[/tex]The moles of Cu in 51.226g are 0.806 mol
4. In a polar covalent bond, the bonded atoms.(1 Point)
Share the electrons equally
Share the electrons unequally.
One atom loses and the other gains.
Both atoms gain electrons
5. In a molecule of bromine Br2
the difference in electronegativity is zero and the bond is polar covalent
the difference in electronegativity is zero and the bond is ionic.
the difference in electronegativity is zero and the bond is nonpolar covalent.
Not enough information to tell.
6. As the difference in electronegativity increases the bond Tends to be
more ionic
less ionic
more covalent
not related
7. a covalent bond takes place between which of the following ?
Metal and a metal
Nonmetal and metal
Nonmetal and nonmetal
All elements of the periodic table
8. When the two atoms share a pair of electrons (one electron each) they have
Double bond
Triple bond
single bond
not enough information to tell
9. atoms try to have a configuration similar to that of a noble gas. This rule is called
. hund's rule
Aufbau principle
Rule of triple
Octet rule
10.1. Which is correct about element A whose electron configuration is 1S2/ 2S2 2P4 ?
Has 4 valence electrons and needs 2 to fulfil the octet rule.
Has 4 valence electrons and needs 4 to fulfil the octet rule.
Has 6 valence electrons and needs 2 to fulfil the octet rule.
Has 6 valence electrons and needs 6 to fulfil the octet rule
Answer for number 4: Share the electrons unequally (I think. I am not 100% about this answer)
Explanation: Covalent bonds in which atoms share electrons unequally are polar. Covalent bonds involve the sharing of electrons between two atoms, but those electrons are not always shared equally. As the electronegativity difference between atoms in a covalent bond increases, electron sharing becomes less even.
Name the type of reaction below:
CaO + H2O →Ca(OH)2
CaO and H2O mix to form Ca(OH)2, a single chemical. It is a combination reaction as a result.
What is combination reaction ?When two or more elements or compounds combine to create a single product, the reaction is known as a direct combination reaction. Equations of the type X + Y. XY are used to depict these reactions.
A combination reaction occurs when two or more components combine to produce a single compound.
Combination reactions occur when two or more reactants come together to create a new product. Synthesis reaction is another name for combination reaction. For instance, hydrogen and chlorine can mix to form hydro-chloride.
Thus, CaO + H2O →Ca(OH)2 this reaction is combination reaction.
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5. 5. A 3 gram sample of Zinc is heated with 100 J and then placed in a calorimeter. Thetemperature of the Water increases from 22 C to 25 C. What is the Specific Heat of
Answer
The Specific Heat of zinc = 11.11 J/g°C
Explanation
Given:
Mass of the zinc sample, m = 3 g
Quantity of heat, Q = 100 J
Initial temperature, T₁ = 22 °C
Final temperature, T₂ = 25 °C
The change in temperature, ΔT = T₂ - T₁ = 25 °C - 22 °C = 3 °C
What to find:
The Specific Heat of zinc, c
Step-by-step solution:
The Specific Heat of zinc, c can be calculated using the formula given below.Q=m
[tex]\begin{gathered} Q=mc\Delta T \\ \\ \Rightarrow c=\frac{Q}{m\Delta T} \end{gathered}[/tex]Putting the values of the given parameters into the formula, we have;c
[tex]c=\frac{100\text{ }J}{3g\times3°C}=\frac{100J}{9\text{ }g°C}=11.11\text{ }J\text{/}g°C[/tex]Hence, the Specific Heat of zinc is 11.11 J/g°C
body that orbits a planet
A body that orbits a planet is satellite.
Answer:
A satellite is a body that orbits a planet. the earth natural satellite is the moon. while the body that revolve round the sun is called planets
Explanation:
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A sample of liquid ethanol is added to a sealed glass beaker.A sealed beaker contains liquid ethanol, represented as circles. Most of the circles are in the liquid, but a few are in the space above the liquid.Figure © 2019 StrongMindBeaker: BlueRingMedia/ShutterstockWhat will happen to the ethanol after a minute?
We don't have information about how fast the equilibrium will be reached, however, we can analyze the options to see which ones are wrong.
What in fact happens is that the system's previous conditions doesn't matter much. After it is sealed, there is no way something gets out. At first, the system will not be at an equilibrium, it needs some time for that.
The system will have ethanol gas condensating and liquid ethanol evaporating, but at different rates.
Assuming the rate of evaporation is higher at the beginning, we will get more ethanol gas with time, but this will decrease the rate of evaporation a situation where both rates are equal. After that point, the system will be at equilibrium, meaning the amount of liquid and gas won't change anymore.
Having that in mind, the first alternative have the first part wront because the system nees time to get to equilibrium, but its second part is wrong too, because as we said the system will eventually stop getting more ethanol gas.
The second is wrong because both evaporating and condensation are happening at the same time, not one after the other.
The third is wrong because it wil always have an equilibrium. If all ethanol condensates, the rate of condensation will be zero and any evaporation that happens will make some ethanol gas back.
We can't know for sure that 1 minute will be enough to reach the equilibrium, but assuming it is, the fourth alternative perfectly describes what is happening: ethanol condensates and increase the pressure up to a point where both rates equilizes and the system reach the equilibrium.
So, the correct option is the fourth alternative.
How many moles of hydrogen gas are present in a 50.0 L steel container if the pressure is at 10.0 ATM and the temperature is 27.0 C(R=.0821atm/mole-k)
• We are given the following :
P = 10 Atm
V= 50 L
R=0.0821atm/mole-k)
T= 27°C = 273.15 + 27°C = 300 .15 K = 300K
• We will use the following formula in order to find moles of hydrogen gas
PV = nRT
n = PV /RT
=( 10 * 50 )/ ( 0.0821 * 300)
n = 500/24.63
n = 20.3 moles
Therefore ; moles of hydrogen gas present = 20.3 moles
There are four sketches below. The first sketch shows a sample of Substance X. The three sketches underneath it show three different changes to the sample.
You must decide whether each of these changes is possible. If a change is possible, you must also decide whether it is a physical change or a chemical change.
Each sketch is drawn as if the sample were under a microscope so powerful that individual atoms could be seen. Also, you should assume that you can see the
entire sample, and that the sample is in a sealed box, so that no matter can enter or leave.
Sample of Substance X
oli
Change 1
Change 2
Change 3
Change 1 is:
Impossible
a physical change
Change 2 is:
Impossible
a physical change
Change 3 is
Impossible
a physical change
Explanation
Check
Physical change: a new substance is not produced.
Chemical change: produces a new substance.
The substance x has one white dot, two black dots and one white again.
W - B - B - W.
If we look at the change 1 we can see that we have one green, two black and another green.
Is it possible to have one green atom? What does that mean? It means that we have another atom there. The problem says that the sample is in a sealed box, so that no matter can enter or leave. So in my opinion the first one is impossible.
In the second change I can't decide between physical and chemical. I think it is a chemical change because there is a rearrengement.
In the third change there are 12 molecules, Each molecule has two black atoms and 4 white atoms. In the substance x only had 24 white atoms, but in the change 3 we have 48 white atoms. As we said before the sample is in a sealed box, so that no matter can enter or leave. So it also impossible.
How many moles of NaOH are in 21.4 mL of 1.29 M NaOH?
Answer:
n = 0.0276 mol
Explanation:
Required: Moles of NaOH
Given:
Volume of NaOH = 21.4 mL
Molarity/concentation = 1.29 M
Solution:
We will use the following equation to solve the problem:
[tex]C\text{ =}\frac{n}{V}[/tex]C is the concentration or molarity in mol/L or M, n is the number of moles in mol and V is the volume in L. Therefore we need to first convert mL to L.
1mL = 0.001 L
therefore 21.4 mL = 0.0214 L
Lets re-arrange the equation:
n = CV
n = 1.29 mol/L x 0.0214 L
n = 0.0276 mol
Which of the following results in a new substance being formed?-Physical Change-Physical Property-Chemical Change-Chemical Property
Answer
Chemical change
Explanation
Chemical changes occur when a substance combines with another to form a new substance,
Calculate the final concentration of a solution created through the following process: 1.7L of a 2.4 M NaF solution is diluted with water to 3.3 L of NaD solution.
The final concentration when 1.7L of a 2.4 M NaF solution is diluted with water to 3.3 L is 1.24 M
Calculating final concentration of solution :
For calculating the final concentration when 1.7L of a 2.4 M NaF solution is diluted with water to 3.3 L we use below given formula
[tex]M_{1} V_{1}[/tex]= [tex]M_{2} V_{2}[/tex]
Where,
[tex]M_{1}[/tex]= 2.4 M
[tex]V_{1}[/tex]= 1.7 L
[tex]M_{2}[/tex]= 'X' to be calculated
[tex]V_{2}[/tex]= 3.3L
(2.4)*1.7=X*3.3
X= 2.4*1.7/3.3
X= 1.24 M
How to calculate concentration ?Divide the solute's mass from the total volume of the solution. Using m as the solute's mass and V as the total volume of the solution, write out the equation C = m/V.
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If 15.2g of aluminum reacts with 39.1g of chlorine, how many g of AlCl3 forms?
Answer:
74.9g of AlCl3 are formed.
Explanation:
1st) It is necessary to write and balance the chemical reaction:
[tex]2Al+3Cl_2\rightarrow2AlCl_3[/tex]From the balanced reaction, we know that 2 moles of Al react with 3 moles of Cl2 to produce 2 moles of AlCl3.
2nd) With the molar mass of Al and Cl2, we can convert the moles to grams:
- Al molar mass: 27g/mol
- Al conversion:
[tex]2moles*\frac{27g}{1mole}=54g[/tex]- Cl2 molar mass: 71g/mol
- Cl2 conversion:
[tex]3moles\frac{71g}{1mole}=213g[/tex]Now we know that from the balanced reaction, 54g of Al react with 213g of Cl2.
3rd) Now we have to find out which compound is the limiting reactant and which compound is the excess reactant:
[tex]\begin{gathered} 54gAl-213gCl_2 \\ 15.2gAl-x=\frac{15.2gAl*213gCl_2}{54gAl} \\ x=59.96gCl_2 \end{gathered}[/tex]Now we know that the 15.2g of Al will need 59.96g of Cl2, but we only have 39.1g of Cl2, so Cl2 is the limiting reactant and Al is the excess reactant.
4th) With the molar mass of AlCl3, we can convert the moles to grams of AlCl3:
- AlCl3 molar mass: 133g/mol
- AlCl3 conversion:
[tex]2moles*\frac{133g}{1mole}=266g[/tex]266g of AlCl3 are formed from the balanced reaction.
5th) Finally, with the limiting reactant and the grams of AlCl3 that must be produced from the balanced reaction, we can calculate the grams of AlCl3 that will be formed from 15.2g of aluminum:
[tex]\begin{gathered} 54gAl-266gAlCl_3 \\ 15.2gAl-x=\frac{15.2gAl*266gAlCl_3}{54gAl} \\ x=74.9gAlCl_3 \end{gathered}[/tex]So, 74.9g of AlCl3 are formed.
what type of reaction is Propane + O2 - Co2 + H2O
Answer: This is a perfect example of a combustion reaction because we have a carbon based compound reaction with oxygen gas to produce carbon dioxide and water. Hopefully this helps!
Explanation:
Can you help me with questions Determine the name for the structure given
Answer: the structure given can be named as 2,3-dichloro-5,6-dimethyl-heptan-4-ol
Explanation:
The question requires us to determine the correct name for the chemical structure given:
To clarify the structure given, let's identify the carbons in the main chain:
Also, we need to identify the functional groups bonded to the carbons in the main chain:
Note that there are three types of functional groups (marked in different colors): 2 Cl atoms (green), 1 hydroxyl group (-OH, blue) and 2 methyl groups (-CH3, purple). Also, note that there are only two methyl groups in the chain, as the carbon numbered as "1" is part of the main chain and not a functional group bonded to it.
Now that we know the size of the main chain, its type (only single bonds between carbons) and the functional groups bonded to it, we can determine the name of the compound:
- main chain of 7 carbons only with single bonds: heptane
- name and position of functional groups: 2,3-dichloro; 4-alcohol, 5,6-dimethyl
Therefore, the complete name of this compound would be:
2,3-dichloro-5,6-dimethyl-heptan-4-ol
How many grams of NaOH are needed to make 100 ml of a 1 M solution? (numbers only, to the nearest 0.1)
ANSWER
The mass of NaOH in grams is 4.0 grams
EXPLANATION
Given data
The volume of the solution = 100 ml
The molarity of the solution = 1 M
To find the mass of NaOH in grams. follow the steps below
Step 1: Find the number of moles by applying the molarity formula
[tex]n\text{ = C}\times v[/tex]Where
n = the number of moles
C = Concentration in molarity
v = volume of the solution in liters
Step 2:convert the volume of the solution from ml to l
[tex]\begin{gathered} \text{ 1ml is equivaent to 0.001l} \\ Hence,\text{ } \\ 100ml\text{ = 100 }\times\text{ 0.001} \\ 100ml\text{ = 0.1l} \end{gathered}[/tex]Step 3: substitute the given data into the formula in step 1
[tex]\begin{gathered} n\text{ = cv} \\ n\text{ = 1 }\times\text{ 0.1} \\ n\text{ = 0.1 mol} \end{gathered}[/tex]Hence, the number of moles of NaOH is 0.1 mol
Step 4: Find the mass in grams by using the below formula
[tex]\text{ Mole = }\frac{\text{ mass}}{\text{ molar mass}}[/tex]Recall, that the molar mass of NaOH is 39.997 g/mol
Step 5: substitute the given data into the formula in step 4
[tex]\begin{gathered} \text{ Mole = }\frac{\text{ mass}}{\text{ molar mass}} \\ 0.1\text{ = }\frac{mass}{39.997} \\ cross\text{ multiply} \\ mass\text{ = 0.1 }\times\text{ 39.997} \\ \text{ Mass = 3.997 grams} \\ \text{ Mass}\approx\text{ 4.0 grams} \end{gathered}[/tex]Hence, the mass of NaOH in grams is 4.0 grams
Consider a gas at (3.420x10^2) kPa in a (7.6100x10^-1) L container at (1.8000x10^1)°C. What will thpressure of the gas be. if it is released into a room with a volume of (1.91x10^4) L and a temperature(1.3000x10^1)°C? Express your answer to three significant digits.
Answer
P2 = 9.84x10^-3 kPa
Explanation
Given:
Pressure 1 = 3.420x10^2 kPa
Volume 1 = 7.6100x10^-1 L
Temperature 1 = 1.8000x10^1 °C
Volume 2 = 1.91x10^4 L
Temperature 2 = 1.3000x10^1°C
Required: To calculate Pressure 2
Solution
We will use the combined gas law to solve this problem
[tex]\frac{P_1V_1}{T_1}\text{ = }\frac{P_2V_2}{T_2}[/tex]Re-arrange to make the subject P2:
P2 = P1V1T2/V2T1
P2 = (3.420x10^2 x 7.6100x10^-1 x 1.3000x10^1)/(1.91x10^4 x 1.8000x10^1)
P2 = 9.84x10^-3 kPa
How will you describe the pattern as electrons are distributed
How will you describe the pattern as electrons are distributed?
In a simple way, you can say, electrons are arranged around an atom's nucleus.
When electrons are near the nucleus, have the lowest energy. Electrons further aways will have higher energy.
We can say electrons are in different shells with different energy. Inside those shells, electrons are in subshells too.
Then you have some numbers that describe the completly characteristics of an electron in an atom.
They are called Quantum Numbers. They are four
1) The principal Quantum number (n): describes the energy of an electron and the most probable distance of the electron from the nucleus. In other words, it refers to the size of the orbital and the energy level an electron is placed in.
2) The number of subshells or (l): describes the shape of the orbital. It can also be used to determine the number of angular nodes.
3) The magnetic Quantum number (ml): describes the energy levels in a subshell. (Remember we have shells and inside of them we have subshells)
4) The Spin of the Electron (ms): refers to the spin of the electron which can either be up or down.
[tex]_{m_{s\text{ }}}[/tex](a) From the differential rate equation given below, write a balanced equation for the reaction involved. 1 d[N o,) i d[NO] d[0] N2011 2 2 dt 4 dt dt rate (b) Given, rate = k[NO2]2[Cl2], by what factor does the rate increase of each of the following changes occurs. i. (NO2) is tripled. ii. [NO2] and [Cl2] are doubled [4M]
We are given an equation that shows the differential rate change of the reaction and it is given as
[tex]-\frac{1}{2}\frac{d}{dt}\lbrack N_2O_5\rbrack=\frac{1}{4}\frac{d}{dt}\lbrack NO_2\rbrack=\frac{d}{dt}\lbrack O_2\rbrack[/tex]This depicts the decomposition reaction of N₂O₅. The forward reaction (product) carries a positive sign while the backward reaction or (reactant) carries a negative sign.
We can as well integrate this, but for the sake of simplicity, the equation of reaction is given as
[tex]2N_2O_5\rightleftarrows4NO_2+O_2[/tex]A person has a sample of gas with a volume of 9.02L and a temperature of 585.57k. If the volume of the container is reduced to 2.24L, what will the new temperature of the gas be in Kelvin?
Step 1 - Understanding the relation between volume and temperature for a gas sample
There are three main variables that can change the state of a gas sample: temperature, pressure and volume. If the pressure (P) is kept constant, the volume (V) becomes proportional to the temperature (T) in K:
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]Step 2 - Substituting the values in the equation above
We know, from the exercise, that V1 = 9.02 L and T1 = 585.57 K, and V2=2.24 L. Substituting these values in the equation above:
[tex]\begin{gathered} \frac{9.02}{585.57}=\frac{2.24}{T_2} \\ \\ T_2=\frac{2.24\times585.57}{9.02}= \end{gathered}[/tex]