Does anybody have the answers for the Chemistry B Semester Exam?
4 answers
I don't even have the questions.
still no answrs here are the questions
Question 1 (1 point)
When ammonium nitrate is dissolved in water in a glass container, the glass container becomes cold. Is this an endothermic or exothermic reaction? How do you know?
a
It is exothermic; heat energy has been released to the surroundings, leaving the container cold.
b
It is endothermic; heat energy has been released to the surroundings, leaving the container cold.
c
It is exothermic; heat energy has been removed from the surroundings, making the container cold.
d
It is endothermic; heat energy has been removed from the surroundings, making the container cold.
Question 2 (1 point)
Which type of reaction has occurred if the products have less potential energy than the reactants?
a
endothermic
b
radiation
c
convection
d
exothermic
Question 3 (5 points)
Use the information above to complete the calculations and answer the questions below.
Column A
1.
How much energy must be absorbed to break the bonds of the 2 molecules of HCl?:
How much energy must be absorbed to break the bonds of the 2 molecules of HCl?
2.
How much energy is released when the bonds of H2 and Cl2 form in the products?
:
How much energy is released when the bonds of H2 and Cl2 form in the products?
3.
What is the total energy of the reaction? (Use the formula: Total bond energies of reactants - Total bond energies of products)
:
What is the total energy of the reaction? (Use the formula: Total bond energies of reactants - Total bond energies of products)
4.
Based on the value of the total energy of the reaction, is this reaction endothermic or exothermic?:
Based on the value of the total energy of the reaction, is this reaction endothermic or exothermic?
5.
True or False - It takes more energy to break the two H–Cl bonds than is released when forming the H–H and Cl–Cl bonds.:
True or False - It takes more energy to break the two H–Cl bonds than is released when forming the H–H and Cl–Cl bonds.
Column B
a. False
b. True
c. Endothermic
d. + 1540 kJ/mol
e. - 247 kJ/mol
f. +184 kJ/mol
g. 862 kJ/mol
h. 431 kJ/mol
i. 678 kJ/mol
j. Exothermic
Question 4 (1 point)
Look at the nuclear notion of the element Polonium, shown above. Which statement below is correct?
a
The element has 84 protons and 126 neutrons in its nucleus.
b
The element has 84 protons and 210 neutrons in its nucleus.
c
The element has 84 neutrons and 210 protons in its nucleus.
d
The element has 84 neutrons and 126 protons in its nucleus.
Question 5 (1 point)
Which letter below represents a balanced nuclear equation?
a
A
b
B
c
C
d
D
Question 6 (3 points)
Question 1 (1 point)
When ammonium nitrate is dissolved in water in a glass container, the glass container becomes cold. Is this an endothermic or exothermic reaction? How do you know?
a
It is exothermic; heat energy has been released to the surroundings, leaving the container cold.
b
It is endothermic; heat energy has been released to the surroundings, leaving the container cold.
c
It is exothermic; heat energy has been removed from the surroundings, making the container cold.
d
It is endothermic; heat energy has been removed from the surroundings, making the container cold.
Question 2 (1 point)
Which type of reaction has occurred if the products have less potential energy than the reactants?
a
endothermic
b
radiation
c
convection
d
exothermic
Question 3 (5 points)
Use the information above to complete the calculations and answer the questions below.
Column A
1.
How much energy must be absorbed to break the bonds of the 2 molecules of HCl?:
How much energy must be absorbed to break the bonds of the 2 molecules of HCl?
2.
How much energy is released when the bonds of H2 and Cl2 form in the products?
:
How much energy is released when the bonds of H2 and Cl2 form in the products?
3.
What is the total energy of the reaction? (Use the formula: Total bond energies of reactants - Total bond energies of products)
:
What is the total energy of the reaction? (Use the formula: Total bond energies of reactants - Total bond energies of products)
4.
Based on the value of the total energy of the reaction, is this reaction endothermic or exothermic?:
Based on the value of the total energy of the reaction, is this reaction endothermic or exothermic?
5.
True or False - It takes more energy to break the two H–Cl bonds than is released when forming the H–H and Cl–Cl bonds.:
True or False - It takes more energy to break the two H–Cl bonds than is released when forming the H–H and Cl–Cl bonds.
Column B
a. False
b. True
c. Endothermic
d. + 1540 kJ/mol
e. - 247 kJ/mol
f. +184 kJ/mol
g. 862 kJ/mol
h. 431 kJ/mol
i. 678 kJ/mol
j. Exothermic
Question 4 (1 point)
Look at the nuclear notion of the element Polonium, shown above. Which statement below is correct?
a
The element has 84 protons and 126 neutrons in its nucleus.
b
The element has 84 protons and 210 neutrons in its nucleus.
c
The element has 84 neutrons and 210 protons in its nucleus.
d
The element has 84 neutrons and 126 protons in its nucleus.
Question 5 (1 point)
Which letter below represents a balanced nuclear equation?
a
A
b
B
c
C
d
D
Question 6 (3 points)
1. A. endothermic heat energy has been removed making it cold
2. A. exothermic
3. matching
4. 84 protons 126 neutrons
2. A. exothermic
3. matching
4. 84 protons 126 neutrons
new exam questions and answers
1. Fe2O3+3H2SO4
how many atoms of oxygen will be found in the product(s) of the reaction?
12
15**
3
4
answer: 15
sorry i wanna play roblox so here are the rest answers;
2. the number of atoms, types of elements, and mass of reactants and products are equal.
3. 64 grams
4. 1.503x10^23
5. polar sugar molecules dissolve in water, which is polar.
6. high temps mean more kinetic energy, which keeps sodium and chlorine ions from combining, which increases solubility.
7. it accepts protons and only partially dissociates in water.
8. ph3 is stronger acid than nh3
9. cooling a purple solution will turn it pink
10. both are flexible, but one conducts electricity while other insulates.
11. high pressure, high temp water extraction
12. reducing environmental impact
13. the scientist is investigating charles’s law, which shows that temp and vol are directly proportional.
14. the relative numbers of protons and neutrons can differ before and after the change, but the total number of those particles remains the same
15. fission is a process in which a large nucleus is split into smaller nuclei
16. beta-minus decay
17. alpha decay
17/17
100% <333
1. Fe2O3+3H2SO4
how many atoms of oxygen will be found in the product(s) of the reaction?
12
15**
3
4
answer: 15
sorry i wanna play roblox so here are the rest answers;
2. the number of atoms, types of elements, and mass of reactants and products are equal.
3. 64 grams
4. 1.503x10^23
5. polar sugar molecules dissolve in water, which is polar.
6. high temps mean more kinetic energy, which keeps sodium and chlorine ions from combining, which increases solubility.
7. it accepts protons and only partially dissociates in water.
8. ph3 is stronger acid than nh3
9. cooling a purple solution will turn it pink
10. both are flexible, but one conducts electricity while other insulates.
11. high pressure, high temp water extraction
12. reducing environmental impact
13. the scientist is investigating charles’s law, which shows that temp and vol are directly proportional.
14. the relative numbers of protons and neutrons can differ before and after the change, but the total number of those particles remains the same
15. fission is a process in which a large nucleus is split into smaller nuclei
16. beta-minus decay
17. alpha decay
17/17
100% <333
14 answers