1. A frozen mass of ice was recorded as -10ºC. It was then warmed untill there was a rise of 10ºC. Calculate the new reading on the thermometer.
2. The reading on thermometer used for patients shows -19ºC before being used. After being laced under the armpit of a patient the mercury rose to 18.5ºC, what was the temperature of the body?
3. The temperature of a liquid is 98ºC. The liquid cools for 20 minutes and its temperature drops to 80ºC.
a) Work out the decrease in temperature.
b) Calculate the rate of cooling per minute.
4. What is the difference in degrees Celsius between the following temperatures?
a) 5 ºC to 49 ºC b) 35 ºC to 64 ºC c) 140 ºC to 155.5 ºC
d) 35.7 ºC to 56 ºC e) 38.9 ºC to 50.1 ºC f) 26.7 ºC to 37.2 ºC
5. A piece of metal cools at the rate of 6 ºC per minute. If the temperature of the metal is 162 ºC, how long does it take for the temperature to reach 90 ºC?
6. The room temperature was 12 ºC. Thirty minutes later after a fire is lit, the temperature rose to 27 ºC.
a) What was the rise in temperature?
b) What was the rate of temperature rise per minute?
7. Water at 30 ºC is heated for 20 minutes. Its temperature rises at the rate of 3 ºC per minute. It is then cooled at 5 ºC per minute for 15 ºC.
a) What is the highest temperature reached by the water?
b) How long does it take the temperature to rise to 60 ºC?
c) What is the lowest temperature reached by the water?
d) After how long does the temperature drop to 40 ºC?
e) What is the temperature after 8 minutes of heating?
8. The graph below shows the rise in temperature as water in a sufuria was heated. Use the graph to answer the following questions.
a) What was the temperature of the water before it was heated?
b) How long did it take the water to reach the highest temperature?
c) How many degrees Celsius did the water rise between the second minute and the ninth minute?
d) What was the highest temperature of the water?
