Given the formula for finding the heat gained or lost, q = m x c x change in temperature, answer the following question.

Question

Don't forget to put correct units.

The temperature of 335 g of water changed from 24.5oC to 26.4oC. How much heat did this sample absorb?

specific heat for water = 4.18 J/goC

Question 1 options:

34307.35 J

36967.92 J

2660.57 J

-2660.57 J

Question 2 (3 points)

Listen
Given the formula for finding the heat gained or lost, q = m x c x change in temperature, answer the following question.

Don't forget to put correct units.

What is the specific heat of silicon if it takes 192J to raise the temperature of 45.0g of Si by 6.0oC?

Question 2 options:
Given the formula for finding the heat gained or lost, q = m x c x change in temperature, answer the following question.

Don't forget to put correct units.

What is the specific heat of silicon if it takes 192J to raise the temperature of 45.0g of Si by 6.0oC?
A)51840J/g C
B)o.71J/g C
C) 4.27J/g C
D) 1,41J/g C

Question 3 (3 points)

Listen
The amount of energy it takes to raise the temperature of a substance one degree per unit of mass is called its:

Question 3 options:

density

entropy

temperature

specific heat

Question 4 (3 points)

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Railroad tracks have gaps between the rails so that they will not buckle in hot weather because of

Question 4 options:

specific heat.

thermal expansion.

thermal conductivity.

thermal insulation.

Question 5 (3 points)

Listen
The process in which matter expands when it is heated is known as

Question 5 options:

condensation.

evaporation.

vaporization.

thermal expansion.

Answer 1

Let's go through each question step by step.

Question 1

To find the heat absorbed by the water, we can use the formula:

\[ q = m \times c \times \Delta T \]

Where:

• \( m \) = mass of the water = 335 g
• \( c \) = specific heat of water = 4.18 J/g°C
• \( \Delta T \) = change in temperature = final temperature - initial temperature = 26.4°C - 24.5°C = 1.9°C

Now, substituting these values into the formula:

\[ q = 335 \text{ g} \times 4.18 \frac{\text{J}}{\text{g°C}} \times 1.9°C \]

Calculating:

\[ q = 335 \times 4.18 \times 1.9 = 2660.57 \text{ J} \]

Thus, the correct answer for Question 1 is: 2660.57 J

Question 2

We can find the specific heat \( c \) using the rearranged formula:

\[ c = \frac{q}{m \times \Delta T} \]

Where:

• \( q \) = 192 J
• \( m \) = 45.0 g
• \( \Delta T \) = 6.0°C

Substituting the values:

\[ c = \frac{192 \text{ J}}{45.0 \text{ g} \times 6.0°C} \]

Calculating:

\[ c = \frac{192}{270} = 0.7111 \frac{\text{J}}{\text{g°C}} \approx 0.71 \frac{\text{J}}{\text{g°C}} \]

Thus, the correct answer for Question 2 is: B) 0.71 J/g°C

Question 3

The amount of energy it takes to raise the temperature of a substance one degree per unit of mass is called its:

• specific heat.

Thus, the correct answer for Question 3 is: specific heat

Question 4

Railroad tracks have gaps between the rails so that they will not buckle in hot weather because of:

• thermal expansion.

Thus, the correct answer for Question 4 is: thermal expansion

Question 5

The process in which matter expands when it is heated is known as:

• thermal expansion.

Thus, the correct answer for Question 5 is: thermal expansion

Here’s a summary of the answers:

1. 2660.57 J
2. B) 0.71 J/g°C
3. specific heat
4. thermal expansion
5. thermal expansion