Question

Question 1
A)Which result occurs during an exothermic reaction?(1 point)
Responses

Light and heat are absorbed from the environment.
Light and heat are absorbed from the environment.

Heat is released into the environment, while light is absorbed.
Heat is released into the environment, while light is absorbed.

Light is released into the environment, while heat is absorbed.
Light is released into the environment, while heat is absorbed.

Light or heat are released into the environment.
Light or heat are released into the environment.
Question 2
A)Which event is an example of an endothermic reaction?(1 point)
Responses

photosynthesis
photosynthesis

condensation
condensation

burning wood
burning wood

rusting of iron
rusting of iron
Question 3
A)How is total reaction energy calculated?(1 point)
Responses

product bond energy × reactant bond energy
product bond energy × reactant bond energy

product bond energy ÷ reactant bond energy
product bond energy ÷ reactant bond energy

reactant bond energy – product bond energy
reactant bond energy – product bond energy

reactant bond energy + product bond energy
reactant bond energy + product bond energy
Question 4
A)
When producing hydrogen iodide, the energy of the reactants is 581 kJ/mol, and the energy of the products is 590 kJ/mol. The equation is shown.

H2 + I2 → 2HI

What is the total energy of the reaction? Is this an endothermic or exothermic reaction?

(1 point)
Responses

9 kJ/mol, endothermic
9 kJ/mol, endothermic

9 kJ/mol, exothermic
9 kJ/mol, exothermic

–9 kJ/mol, endothermic
–9 kJ/mol, endothermic

–9 kJ/mol, exothermic
–9 kJ/mol, exothermic
Question 5
A)The specific heat for iron is 0.450 J/g⋅K. A piece of iron increases from 27.2°C to 31.4°C when of energy is added to it. What is the mass of the iron?(1 point)
Responses

343 g
343 g

0.0029 g
0 point 0 0 2 9 g

1.65×10−4 g
1 point 6 5 times 10 to the negative 4 power g

286 g
286 g

Answer 1

Here are the correct answers to your questions:

**Question 1**
A) Which result occurs during an exothermic reaction?
**Response:** Light or heat are released into the environment.

**Question 2**
A) Which event is an example of an endothermic reaction?
**Response:** photosynthesis

**Question 3**
A) How is total reaction energy calculated?
**Response:** reactant bond energy – product bond energy

**Question 4**
A) When producing hydrogen iodide, the energy of the reactants is 581 kJ/mol, and the energy of the products is 590 kJ/mol. What is the total energy of the reaction? Is this an endothermic or exothermic reaction?
**Response:** 9 kJ/mol, endothermic

**Question 5**
A) The specific heat for iron is 0.450 J/g⋅K. A piece of iron increases from 27.2°C to 31.4°C when a certain amount of energy is added to it. What is the mass of the iron?
To solve this, we use the formula:
\[ q = mc\Delta T \]
Where:
- \( q \) = heat added
- \( m \) = mass of the substance
- \( c \) = specific heat capacity
- \( \Delta T \) = change in temperature

First, calculate \( \Delta T \):
\[ \Delta T = 31.4 °C - 27.2 °C = 4.2 °C \]

Assuming we know the amount of energy (q), we can rearrange the equation to find mass \( m \) if needed. However, as it stands, without a specified amount of energy (q), we cannot directly compute the mass of iron from the responses given. If we had energy, we could compute it.

Assuming it's just a check for the answer options and not needing the actual calculation, I can't definitively mark the correct answer because the mass can't be calculated without knowing the amount of energy added.

If you have a specific energy value added to it, I could help calculate the mass.