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Exam 3: Matter and Energy

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Question 21

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A temperature of 50.°F is equivalent to ________°C.

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Question 22

Multiple Choice

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Which of the following is an example of potential energy?

A) chewing food
B) water stored in a reservoir
C) burning wood
D) a fan blade turning
E) riding an exercise bike

F) C) and E)
G) A) and B)

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Question 23

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When a liquid is boiling,its temperature does not change.

A potato contains 20 g of carbohydrate.If carbohydrate has a caloric value of 4 kcal/g,how many kcal are obtained from the carbohydrate in the potato?

An object with a temperature of 20 °C is hotter than another object with a temperature of 20 °F.

The change of state from solid to gas is termed ________.

If the temperature is 20.°C,what is the corresponding temperature on the Fahrenheit scale?

A food sample contains 6 g of carbohydrate and 4 g of protein.How many kcal from carbohydrate and protein are in the sample? (Round each food group to the tens place.)

Black coffee is a homogeneous mixture.

When a solid is converted directly to a gas,the change of state is called ________.

Helium is a(n) ________.

One cup of kidney beans contains 15 g of protein,1 g of fat,and 42 g of carbohydrate.How many kilocalories,to two significant figures,does this sample contain? (The caloric values are: 4 kcal/g for carbohydrate,9 kcal/g for fat,and 4 kcal/g for protein.Round off the energy value for each food group to the tens place.)

How many calories are required to raise the temperature of a 35.0 g sample of iron from 25 °C to 35 °C? Iron has a specific heat of 0.108 cal/g °C.

Which of the following is an element?

One gram of fat has less energy that one gram of protein.

A cheeseburger from a fast food restaurant contains 19 g of fat,20 g of carbohydrate,and 28 g of protein.How many kcal of energy does the cheeseburger contain? (The caloric values are: 4 kcal/g for carbohydrate,9 kcal/g for fat,and 4 kcal/g for protein.Round off the energy value for each food group to the tens place.)

Bromine ( Br₂ ) -Air is a heterogeneous mixture.

A patient has a temperature of 38.5 °C.What is the temperature in degrees Fahrenheit?

650 cal = 2700 J

Bromine ( Br₂ ) --15 °C