Answer:
The average persons requires 75000 breaths to exhale 1.0 Kg of fat
Explanation:
Note: The question is incomplete. The complete question is given below:
"The human body burns glucose (C6H1206) for energy according to this chemical reaction:
C6H1206 + 602----> 6CO2 + 6H20
The products of the reaction are carbon dioxide (CO2) and water (H20). Interestingly, all of the carbon dioxide and much of the water exits the body through the lungs: on every breath, the average person exhales 500 mL of air, which is typically enriched to 4% CO2 and 5% water vapor by volume. In short, when a person loses weight by dieting, the weight that is lost actually departs his body as a gas, every time he exhales. Each kilogram of body fat lost requires exhaling about 3.0 kg of carbon dioxide. Calculate how many breaths it takes an average person to "exhale" 1.00 kg of fat. Round your answer to the nearest thousand. You'll need to know that the density of CO2 is 2.0 kg/m³”.
Volume of air exhaled on average per breath = 500 mL
Volume of CO2 exhaled per breath = 4/100 × 500 = 20 mL
Since, 1000000 mL = 1 m³;
20 mL = 0.00002 m³
3.0 kg of CO2 is exhaled per Kg of fat.
Density of CO2 = 2.0 Kg/m³
Volume = mass/density
Volume of 3.0 Kg CO2 = 3.0/2.0 = 1.5 m³
Number of breaths that will have a volume of 1.5 m³ = 1.5/0.00002 = 75000 breaths.
The atomic number of an atom is always equal to the total number of
neutrons in the nucleus
neutrons plus protons in the atom
protons in the nucleus
protons plus electrons in the atom
The amount of protons in the nucleus multiplied by the atomic number of an atom results in a constant value.
Why do protons exist?a fundamental unit of matter that shares the same structure as the hydrogen atom's nucleus, makes up all other atomic nuclei together with the neutron, has a mass of 1.673 1027 kilograms, and carries a positive charge that is numerically equal to the charge of an electron.
What materials make up protons?Two up quarks as well as a down quark combine to form protons. One up quark with two down quarks make up neutrons. The nucleus is kept together by one of the four basic forces known as the "strong nuclear force."
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Placing a sample of iron (II) oxide into a graduated cylinder makes the water volume increase 12.0 mL. The weight of the sample is 76.6 g. What is its density?
Answer:
Density, [tex]d=6.38\ g/cm^3[/tex]
Explanation:
It is given that, placing a sample of iron (II) oxide into a graduated cylinder makes the water volume increase 12.0 mL.
It means that the volume of the sample is 12 mL
The weight of the sample is 76.6 g
We need to find the density of the sample.
12 mL = 12 cm³
The formula of density is given by :
[tex]d=\dfrac{m}{V}\\\\d=\dfrac{76.6\ g}{12\ cm^3}\\\\d=6.38\ g/cm^3[/tex]
So, the density of the sample is [tex]6.38\ g/cm^3[/tex].
Answer:
6.38
Explanation:
D=M/V
D= 76.6/12.0
D=6.38
What is the amount of matter in an object? O Kilograms O Mass O Volume O Weight
Answer:
Mass
Explanation:
Mass measures the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg). Volume measures the amount of space that a substance or an object takes up.
The amount of matter in an object is given in terms of it's mass.
What is the relation between mass and weight?
Mass is defined as the combination of physical properties of an object and the resistance which object undergoes when force is applied to it.It contains total number of protons,electrons and neutrons present in the atom of an object.
Mass does not change according to location but weight does change according to location as the amount of gravity varies from one location to another.Mass can be measured using any kind of balance but weight is measured by using spring balance only.
The SI unit of mass is kilograms.Weight is defined as force exerted on an object due to the gravitational force.Weight and mass are directly proportional to each other.Their relation is based on Newton's second law of motion .Formula of weight is
w=m×g
where, w=weight of object
m=mass of an object
g=gravity acting on the object
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1. Which of the following is a valid piece of scientific evidence?
a. The amount of snow pack in the mountains
b. The way a piece of music makes you feel
C. How many people like brownies more than cake
d. The color blue being called a calming color
Answer: A
Explanation: The other options are opinions and can vary in the way that people respond
The valid piece of scientific evidence among the options provided is:
a. The amount of snow pack in the mountains
Scientific evidence refers to observations or data that can be objectively measured, tested, and analyzed. The amount of snow pack in the mountains can be quantitatively measured and observed, making it a valid piece of scientific evidence. It can be used to study climate patterns, water availability, and various other scientific phenomena related to snow and mountain ecosystems.
The other options, b. The way a piece of music makes you feel, c. How many people like brownies more than cake, and d. The color blue being called a calming color, involve subjective experiences, personal preferences, and cultural associations rather than empirical observations that can be tested and measured in a scientific context.
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How many grams of HNO3 is needed to make 1.5 L of a 3 M solution of HNO3?
Answer:
[tex]m_{HNO_3}=283.5gHNO_3[/tex]
Explanation:
Hello,
In this case, since the molarity is defined in terms of the moles of solute and the volume of solution in liters as follows:
[tex]M=\frac{mol}{V}[/tex]
In such a way, solving for the moles of nitric acid, we obtain:
[tex]mol=M*V=1.5L*3mol/L=4.5molHNO_3[/tex]
Finally, since the molar mass of nitric acid is 63 g/mol, the mass is computed as:
[tex]m_{HNO_3}=4.5molHNO_3*\frac{63gHNO_3}{1molHNO_3} \\\\m_{HNO_3}=283.5gHNO_3[/tex]
Regards.
Which of the following discovery led mankind to observe changes in certain rocks and minerals which further led to the development of ceramics, glass, and metals?
a. Plasma
b. Plastic
c. Fire
d. Neoprene
e. Rubber
Answer:
A
Explanation:
It is safest to heat the contents of test tubes in a flame while seated.
a) true
b) false
Answer:
False because the contaminents will get on your lap while having less time to react
Explanation:
Answer:
False
I hope this helps!
g the __ of the partial pressures of each gas in a mixture must equal the total pressure of the enntire gas mixture
Answer:
Sum.
Explanation:
Hello,
In this case, the Dalton's law states that the SUM of the partial pressures of each gas in a mixture must equal the total pressure of the entire gas mixture, considering its mathematical definition for a i-containing gas mixture:
[tex]P_t=P_1+P_2+...+P_i[/tex]
Regards.
Identify the missing nuclide in the following nuclear equation:
214 Pb → 0 e + ?
82 -1
A. Pb-215.
B. Bi-214.
C. Pb-213.
D. TI-215.
E. TI-214.
Answer:
B. Bi-214.
Explanation:
The equation shows beta particle emission of 214/82 Pb which result into 214/83 Bi, in which the mass remain same but the the atomic number increases by one.
During this emission neutron get split into an electron and a proton which are represented as 0/e/-1.
So, the final nuclear equation becomes : 214/82 Pb => 0 e -1 + 214/83 Bi
Hence, the correct answer is "B. Bi-214."
Write the formulas for: Ca and CI, Na and CI, H and 0, Al and 0, and K and F.
Answer:
Below
Explanation:
Combination of Calcium(Ca) and Chlorine(Cl); Calcium chloride
[tex]Ca+Cl_2 -> CaCl_2[/tex]
Combination of Sodium(Na) and Chlorine(Cl); Sodium chloride(salt)
[tex]Na+Cl_2 -> NaCl[/tex]
Combination of Hydrogen(H) and Oxygen(O);(water)
[tex]H_2 +O_2-> H_2O[/tex]
Combination of Potassium (K) and Fluorine(f) ; Potassium fluoride
[tex]K+F ->KF[/tex]
Prospectors are considering searching for gold on a plot of land that contains 2.45 g of gold per bucket of soil. If the volume of the bucket is 5.25L, how many grams of gold are there likely to be in 1.0 cubic feet of soil
Answer:
13.2 g of gold
Explanation:
We'll begin by converting 5.25 L to ft³.
This can be obtained as follow:
Recall:
1 L = 0.0353 ft³
Therefore,
5.25 L = 5.25 × 0.0353
5.25 L = 1.85×10¯¹ ft³
From the question given above,
2.45 g of gold is present in 5.25 L ( i.e 1.85×10¯¹ ft³) of soil.
Therefore, Xg of gold will be present in 1 ft³ of soil i.e
Xg of gold = 2.45/1.85×10¯¹
Xg of gold = 13.2 g
Therefore, 13.2 g of gold is present in 1 ft³ of the soil.
Water flows over Niagara Falls at the average rate of 2,400,000 kg/s, and the average height of the falls is about 50 m. Knowing that the gravitational potential energy of falling water per second = mass (kg) × height (m) × gravity (9.8 m/s2), what is the power of Niagara Falls? How many 15 W LED light bulbs could it power?
Answer:
Power, [tex]P=1.176\times 10^9\ W[/tex]
No of bulbs = 78400000
Explanation:
We have,
Water flows over Niagara Falls at the average rate of 2,400,000 kg/s, it mean it is mass per unit time i.e. m/t.
It falls from a height of 50 m
The gravitational potential energy of falling water is given by :
P = mgh
Power is equal to the work done divided by time taken. So,
[tex]P=\dfrac{W}{t}\\\\P=\dfrac{mgh}{t}\\\\P=\dfrac{m}{t}\times gh[/tex]
So,
[tex]P=2400000\times 9.8\times 50\\\\P=1.176\times 10^9\ W[/tex]
Let there are n bulbs that could power 15 W LED. It can be calculated by dividing the power by 15. So,
[tex]n=\dfrac{1.176\times 10^9}{15}\\\\n=78400000\ \text{bulbs}[/tex]
It means that the number of bulbs are 78400000.
From this value, and assuming that air contains only molecular nitrogen and molecular oxygen gases, calculate the mass percent of N2 and of O2 in air.
Answer:
60% and 52%
Explanation:
At Standard temperature and volume (STP)
Volume of gas = 22.4L
Density = mass/volume
⇒ 1.186 = [tex]\frac{mass}{22.4}[/tex]
= 26.566g
Molar mass of O2 = 16g/mole
Molar mass of N2 = 14g/mol
% mass of O2 = 16/26.566 × 100
= 60.23 %
% mass of N2 = 14/26.566 × 100
= 52.70 %
(Check: totl composition of gas is 100% i.e 60 + 52 %)
Which of the following radioactive nuclei is most likely to decay via emission of a β−β− particle?
a. neptunium-237.
b. magnesium-23.
c. iodine-131.
d. rubidium-83.
e. nitrogen-13.
Answer:
iodine-131
Explanation:
Beta emission involves the conversion of a neutron to a proton and an electron. This process increases the atomic number of the daughter nucleus by 1 unit while the mass number remains the same.
Beta emission decreases the N/P ratio and is the ideal decay mod for nuclides that have a very large number of neutrons such as iodine-131.
Both elements and compounds may be composed of molecules. Record one or more characteristics that explain when a molecule is the building block of elements and when a molecule is a building block of compounds. Use the terms atom(s), molecule(s), element(s), and compound(s) correctly in your explanation. Please help me explain....
Answer:
An element contains molecules composed of same atoms while a compound contains molecules of different atoms
Please find the explanation to the question below
Explanation:
A molecule is the smallest unit of a compound or element responsible for their chemical properties. It is a chemical combination of two or more atoms, which can be of the same or different elements.
Both elements and compounds are made up of molecules as rightly said in the question. However, they form in different ways. All compounds are made of molecules but not all molecules form compounds.
- When two or more of the atoms are chemically joined together by bonds, a molecule of that ELEMENT is formed. For example, a molecule of oxygen element (02) is formed when two oxygen atoms are joined together by chemical bonds.
- On the other hand, when two or more atoms of different elements are joined together by chemical bonds, a COMPOUND is formed. Hence, a compound is said to contain molecules of different elements or molecules of different atoms. For example, water molecule (H2O) is a compound because it contains the atoms of different elements (hydrogen and oxygen) joined together.
Consider a lithium nucleus, of charge +3q. Calculate the first three electron energies for an electron in a Li++ ion, using the Bohr model.
Answer:
[tex]\mathbf{E_1 = -40.8 \ eV}[/tex]
[tex]\mathbf{E_2= -10.2 \ eV}[/tex]
[tex]\mathbf{E_3=-4.533 \e V}[/tex]
Explanation:
In an hydrogen like atoms, the formula related to the energy of an nth quantum number is:
[tex]E_n =\dfrac{ -13.6 \times Z}{n^2}[/tex]
where;
lithium Z = 3
therefore, the energy levels for Li²⁺ are
n=1 , n=2, n= 3
[tex]E_1 =\dfrac{ -13.6 \times 3}{1^2}[/tex]
[tex]E_1 = -13.6 \times 3[/tex]
[tex]\mathbf{E_1 = -40.8 \ eV}[/tex]
[tex]E_2=\dfrac{ -13.6 \times 3}{2^2}[/tex]
[tex]E_2=\dfrac{ -13.6 \times 3}{4}[/tex]
[tex]\mathbf{E_2= -10.2 \ eV}[/tex]
[tex]E_3=\dfrac{ -13.6 \times 3}{3^2}[/tex]
[tex]E_3=\dfrac{ -13.6 \times 3}{9}[/tex]
[tex]\mathbf{E_3=-4.533 \e V}[/tex]
What is the mass of an object with a density of 2.77 g/ml with a volume of 10.77L?
Answer:
d =
m
V
m = d×V
V =
m
d
DENSITY
Density is defined as mass per unit volume.
d =
m
V
Example:
A brick of salt measuring 10.0 cm x 10.0 cm x 2.00 cm has a mass of 433 g. What is its density?
Step 1: Calculate the volume
V = lwh = 10.0 cm × 10.0 cm × 2.00 cm = 200 cm³
Step 2: Calculate the density
d =
m
V
=
433
g
200
c
m
³
= 2.16 g/cm³
MASS
d =
m
V
We can rearrange this to get the expression for the mass.
m = d×V
Example:
If 500 mL of a liquid has a density of 1.11 g/mL, what is its mass?
m = d×V = 500 mL ×
1.11
g
1
m
L
= 555 g
VOLUME
d =
m
V
We can rearrange this to get the expression for the volume.
V =
m
d
Example:
What is the volume of a bar of gold that has a mass of 14.83 kg. The density of gold is 19.32 g/cm³.
Step 1: Convert kilograms to grams.
14.83 kg ×
1000
g
1
k
g
= 14 830 g
Step 2: Calculate the volume.
V =
m
d
= 14 830 g ×
1
c
m
³
19.32
g
= 767.6 cm³Explanation:
Answer:
29832.90 g
Explanation:
D x V
2.77 g/ml x 10770 ml
= 29832.90 g
Using the balanced equation below,
how many grams of carbon dioxide
would be produced from the
complete reaction of 83.7 g carbon
monoxide?
Fe2O3 + 3CO → 2Fe + 3CO2
Answer:131.6 g
Explanation:
131.6 grams of carbon dioxide would be produced from the complete reaction of 83.7 g carbon monoxide.
The balanced chemical equation is given below.
Fe2O3 + 3CO → 2Fe + 3CO2
Calculation,
Since, 28g of carbon dioxide produces 44g of carbon monoxide.
So, 83.7 g of carbon dioxide produces 44×83.7/28 grams
83.7 g of carbon dioxide produces 131.6 grams
What is chemical equation?The symbolic representation of chemical reaction in which reactant represents in left side and product represents in right side is called chemical equation.
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Draw the structure of a molecule which contains only carbon and hydrogen atoms (only three of which are carbon) and in which two of the carbons are sp2 hybridized and the other is sp hybridized.
Answer:
CH₂ = C = CH₂
Explanation:
Hybridization is the mixing and blending of two or more pure atomic orbitals (s, p and d) to form two or more hybrid atomic orbitals that are identical in shape and energy e.d sp, sp², sp³, sp³d, sp³d² etc.
The structure of the organic molecule that contains only carbon and hydrogen atoms where there exist only three of which are carbon and in which two of the carbons are sp2 hybridized and the other is sp hybridized can be seen below.
CH₂ = C = CH₂ ( where the = sign represent the double bonds)
Here, The two carbons that are sp₂ hybridized are CH₂
the other carbon that is sp hybdrized is C
Given the incomplete equation 4Al + 3O2 → 2X, what compound is X?
Answer:
4Al + 3O2 => 2Al2O3
(balanced equation)
The compound is Al₂O₃ and the chemical equation is 4 Al + 3 O₂ → 2 Al₂O₃.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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In the titration of 69.0 mL of 0.400 M HCOOH with 0.150 M LiOH, how many mL of LiOH are required to reach the equivalence point
Answer:
184mL of LiOH are required
Explanation:
HCOOH, formic acid, reacts with lithium hydroxide, LiOH, as follows:
HCOOH + LiOH → LiCOOH + H₂O
Based on the equation, 1 mole of HCOOH reacts per mole of LiOH.
Thus, to know hoy many moles of LiOH you need to reach the equivalence pointy, you know the moles of HCOOH you have to neutralize.
Moles HCOOH you need to neutralize:
69.0mL = 0.069L * (0.400mol / L) = 0.0276 moles HCOOH
That means you need to add 0.0276 moles of LiOH to neutralize the formic acid. With molar concentration, we can determine the volume of LiOH, thus:
Volume 0.150M LiOH:
0.0276 moles LiOH * (1L / 0.150moles LiOH) = 0.184L of 0.150M LiOH =
184mL of LiOH are requiredthe volume of the base, LiOH required to reach the equivalence point is 184 mL
We'll begin by writing the balanced equation for the reaction. This is given below
HCOOH + LiOH —> HCOOLi + H₂O
From the balanced equequationation above,
The mole ratio of the acid, HCOOH (nA) = 1
The mole ratio of the base, LiOH (nB) = 1
From the question given above, the following data were:
Volume of acid, HCOOH (Va) = 69.0 mL
Molarity of acid, HCOOH (Ma) = 0.4 M
Molarity of base, LiOH (Mb) = 0.150 M
Volume of base, LiOH (Vb) =?The volume of the base, LiOH required to reach the equivalence point can be obtained as follow:
MaVa / MbVb = nA / nB
(0.4 × 69) / (0.150 × Vb) = 1
27.6 / (0.150 × Vb) = 1
Cross multiply
0.150 × Vb = 27.6
Divide both side by 0.150
Vb = 27.6 / 0.150
Vb = 184 mLTherefore, the volume of the base, LiOH required to reach the equivalence point is 184 mL
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Which of the following names the quantity and correctly explains why that represents the astronauts weight
Answer:
b
Explanation:
It's do at 11 please help.
5. Be prepared to prove your understanding of atomic shells.
6. Understand the basics of isotopes and ions.
7. Know about the term "valence" and how it is used with regard to the atom.
8. Know the basics of acids and bases.
9. Understand the organization of the elements in the periodic table.
6.)Isotopy is a phenomenon whereby atoms of an element exhibit different mass numbers but have the same atomic number. Ion is any atom or group of atoms which possesses an electric charge.
8.) Acid is a substance which produces hydrogen ions (or protons) as the only positive ion when dissolved in water.Base is a substance which will will neutralize an acid to yield a salt and water only.
7.) Valency is the combining power of an element or radical.It is actually the oxidation number assigned to the element or group of elements.
5.) Atomic shells are K,L,M,N.The electrons are negatively charged and revolve around the nucleus in spherical regions called shells or energy levels.
9.) Families of Element:Group 1 &2 make up the s-block.Group 3 to 7 and 0 form the p-block.The transition elements occurs between Groups 2 and 3 in the periodic table.They form the d-block because they contain d electrons in addition to the s and p electron.The lanthanides and actinides also occurs between group 2 and 3 in periods 6 and 7 respectively. They form the f-block because they contain f electrons in addition to the s,p and d electrons.
I hope this helps.....
What governs the behavior of electrons?
Answer:
A feature called an atomic orbital describes the wave-like behavior of a bound electron.
Explanation:
Each orbital has its own set of quantum numbers such as energy, angular momentum and angular momentum projection, and there is only a distinct set of such orbitals around the nucleus.
When looking at the equilibrium between silver bromide and its aqueous ions, what could be added to solution to promote precipitation of silver bromide?
Answer:
NaBr
Explanation:
When AgBr is dissolved in water, the following equilibrium is set up in solution;
AgBr(s)⇄Ag^+(aq) + Br^- (aq)
If we dissolve NaBr in the water, a common ion (Br^-) is now introduced into the system. This increases the concentration of Br^- and favours the reverse reaction hence more AgBr is precipitated. This is known as common ion effect.
Which of the following equilibria would not be affected by pressure changes at constant temperature?
A) CO(g) + 1/2O2(g) CO2(g).
B) CaCO3(s) CaO(s) + CO2(g).
C) 2H2(g) + O2(g) 2H2O(l).
D) 2Hg(l) + O2(g) 2HgO(s).
E) CO2(g) + H2(g) CO(g) + H2O(g).
Answer:
Option A) CO(g) + 1/2O2(g) <=> CO2(g).
Explanation:
A background knowledge of reaction rates shows that pressure will only affect gaseous reactant.
Further more, we understood that for pressure to effectively affect gaseous molecules, the total volume of the gaseous reactant must be different from the total volume of the gaseous products.
Now, let us consider the equation given in the question:
A) CO(g) + 1/2O2(g) <=> CO2(g).
B) CaCO3(s) <=> CaO(s) + CO2(g).
C) 2H2(g) + O2(g) <=> 2H2O(l).
D) 2Hg(l) + O2(g) <=> 2HgO(s).
E) CO2(g) + H2(g) <=> CO(g) + H2O(g).
From the above, only option A and E has gaseous reactant and product.
For option A:
CO(g) + 1/2O2(g) <=> CO2(g).
Total volume of reactant = 1 + 1/2 = 3/2 L
Total volume of product = 1 L
Since the volume of the reactant and that of the product are different, therefore, a change in pressure will affect the reaction.
For option E:
CO2(g) + H2(g) <=> CO(g) + H2O(g).
Total volume of reactant = 1 + 1 = 2 L
Total volume of product = 1 + 1 = 2 L
Since the volume of the reactant and that of the product are the same, therefore, a change in pressure will have no effect in the reaction.
The equilibrium equation, CO2(g) + H2(g) ⇄ CO(g) + H2O(g), is not affected by pressure changes at constant temperature because there are equal volumes of reactants and products on both sides of reaction equation.
For a gas phase reaction, changes in pressure would affect the direction in which the reaction moves. When the pressure is increased, the reaction moves in the direction of lesser volumes. When the pressure is decreased, the reaction moves in the direction of greater volumes.
For the reaction; CO2(g) + H2(g) ⇄ CO(g) + H2O(g), there are equal volumes of reactants and products on either side of the reaction equation. Therefore, the equilibria would not be affected by pressure changes at constant temperature.
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What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest whole-number coefficients? C3H6O2(l) + O2(g) → CO2(g) + H2O(l)A) 5 B) 7 C) 1 D) 3
Answer:
Option (B) 7
Explanation:
C3H6O2(l) + O2(g) → CO2(g) + H2O(l)
To know the coefficient of O2 in the above equation, let us balance the equation.
The above equation can be balance as follow:
C3H6O2(l) + O2(g) → CO2(g) + H2O(l)
There are 3 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 3 in front of CO2 as shown below:
C3H6O2(l) + O2(g) → 3CO2(g) + H2O(l)
There are 6 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 3 in front of H2O as shown below:
C3H6O2(l) + O2(g) → 3CO2(g) + 3H2O(l)
There are a total of 4 atoms of O on the left side and a total of 9 atoms on the right side. It can be balance by putting 7/2 in front of O2 as show below:
C3H6O2(l) + 7/2O2(g) → 3CO2(g) + 3H2O(l)
Multiply through by 2
2C3H6O2(l) + 7O2(g) → 6CO2(g) + 6H2O(l)
Now, the equation is balanced.
From the balanced equation above, the coefficient of O2 is 7.
The normal boiling point of acetic acid is 118.1°C. If a sample of the acetic acid is at 125.2°C, predict the signs of ΔH, ΔS, and ΔG for the boiling process at this temperature
The question is incomplete, the complete question is;
The normal boiling point of acetic acid is 118.1°C. If a sample of the acetic acid is at 125.2°C, predict the signs of ∆H, ∆S, and ∆G for the boiling process at this temperature.
A. ∆H > 0, ∆S > 0, ∆G < 0
B. ∆H > 0, ∆S > 0, ∆G > 0
C. ∆H > 0, ∆S < 0, ∆G < 0
D. ∆H < 0, ∆S > 0, ∆G > 0
E. ∆H < 0, ∆S < 0, ∆G > 0
Answer:
A. ∆H > 0, ∆S > 0, ∆G < 0
Explanation:
During boiling, a liquid is converted to vapour. This is a phase change for which heat is absorbed because energy must be taken in to break the intermolecular bonds in the liquid before it can be converted to a gas. Hence ∆H>0
Secondly, a phase change from liquid to gas leads to an increase in entropy hence ∆S>0.
Thirdly, the process is spontaneous. For every spontaneous process ∆G<0
Question 4 of 10
Which question asks for an opinion?
A. How much electricity does the average nuclear power plant
generate?
B. Should the government invest more money in nuclear energy than
in solar energy?
C. What are the by-products generated by the manufacture of solar
panels?
D. How efficient is the most advanced solar energy technology?
Answer:
Should the government invest more money in nuclear energy than
in solar energy
Explanation:
This is because some people might think government should invest in nuclear energy while others might want the government to invest in solar energy.
Answer:
B. "Should the government..."; the answer to this relies on subjective input (what the audience thinks the government should do).
Explanation:
Think about the differences between statements that are subjective and objective. If you look at A, C, or D, these results of these experiments are all objective:
A) The amount of electricity generated by a power plant isn't "arguable"; it's a definite value that I can't just "make up" or "think" is correct/valid.
C) The byproducts generated by manufacture aren't "arguable" either; if a byproduct is heat, there's no subjective input.
D) Try to use the above reasoning for D!
4.0 g Mg and 4.0 g O2 are placed in a container and magnesium oxide, MgO, forms. The Mg is totally consumed but 1.4 g O2 remains. How much magnesium oxide formed
Answer:
The correct answer is: 6.6 g MgO
Explanation:
First we have to write and balance the chemical reaction as follows:
2Mg(s) + O₂(g) → 2MgO(s)
That means that 2 moles of Mg(s) react with 1 mol of O₂(g) to give 2 moles of MgO(s). If Mg is totally consumed and a mass of O₂ remains unaltered after reaction, the limiting reactant is Mg. We use the limiting reactant to calculate the mass of product.
According to the balanced chemical equation, 2 moles of Mg(s) produce 2 moles of MgO(s).
2 moles Mg = 2 mol x molar mas Mg= 2 mol x 24.3 g/mol = 48.6 g Mg
2 moles MgO= 2 mol x (molar mass Mg + molar mass O) = 2 mol x (24.3 g/mol + 16 g/mol) = 80.6 g MgO
The stoichiometric ratio is 80.6 g MgO/48.6 g Mg. So, we multiply this ratio by the mass of consumed Mg (4.0 g) in order to obtain the produced mass of MgO:
4.0 g Mg x 80.6 g MgO/48.6 g Mg = 6.63 g MgO
6.6 grams of magnesium oxide are formed.