Exam 3: Matter and Energy

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

Which of the following is an example of potential energy?

Which of the following is an element?

Black coffee is a homogeneous mixture.

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

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?

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

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

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 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.)

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.

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.)

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

650 cal = 2700 J

Bromine ( Br₂ ) --15 °C

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

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

Helium is a(n)________.

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