Lelfy

Thermochemistry Quiz

Thermochemistry: ten practice questions on heat transfer and calorimetry, with concepts and calculations. Every answer is explained.

Free, with no sign-up.

ByLelfy Editorial Team

For High school students and adults reviewing the topic.

About 12 minutes. 10 questions.

How does it work?

  1. Choose one answer or enter a number in the stated unit, then check it.
  2. Your first submitted answer counts toward the score. There is no timer.

What will you get?

See your first-attempt score and an explanation for every answer.

Question 1A sample absorbs heat without doing work or changing phase. Which sign does q have for the sample?
Question 2Heat 100 g of water from 20 °C to 30 °C. Use c = 4.184 J/(g·°C). How much heat does the water absorb?

Answers within 0.01 J of the expected value are accepted.

Question 3A 100 g copper sample warms from 20 °C to 40 °C. Use c = 0.385 J/(g·°C). Find the heat absorbed.

Answers within 0.01 J of the expected value are accepted.

Question 4A 50 g water sample absorbs 1046 J. Use c = 4.184 J/(g·°C). Find its temperature increase.

Answers within 0.01 °C of the expected value are accepted.

Question 5Two samples exchange heat in an insulated calorimeter with negligible heat capacity. No other energy transfer occurs. What is the relationship between their heat changes?
Question 6Mix 100 g of water at 80 °C with 100 g of water at 20 °C. Both have c = 4.184 J/(g·°C). With no heat loss or phase change, find the final temperature.

Answers within 0.01 °C of the expected value are accepted.

Question 7Mix 100 g of water at 80 °C with 200 g of water at 20 °C. Both have c = 4.184 J/(g·°C). With no heat loss or phase change, find the final temperature.

Answers within 0.01 °C of the expected value are accepted.

Question 8Equal masses of water and copper each absorb 100 J without changing phase. Water has the greater specific heat. Which sample has the smaller temperature rise?
Question 9A 50 g water sample cools from 30 °C to 20 °C. Use c = 4.184 J/(g·°C). Find q for the water, including its sign.

Answers within 0.01 J of the expected value are accepted.

Question 10Why must a simple q = mcΔT calculation be changed when a sample melts at a constant temperature?

Answer every question to see and share your score.

Read the topic guide