Q: Which of the following best describes the energy unit 'calorie' as used on food labels?

It is actually a kilocalorie ($$1\ \text{kcal} = 1000\ \text{cal})$$

Q: Which of the following is the correct formula for specific heat?

$$\text{Specific heat} = \frac{\text{heat}}{\text{mass} \times \Delta T}$$

Question 1

Which of the following is the correct SI unit for measuring mass?

Accepted Answer

kilogram (kg)

Question 2

A student measures the mass of a sample as 0.00450 g. How many significant figures does this measurement have?

Accepted Answer

3

Question 3

Convert 2.5 inches to centimeters using the conversion factor $$1\ 	ext{in} = 2.54\ 	ext{cm}.$$

Accepted Answer

$$6.35\ 	ext{cm}$$

Question 4

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture where the composition is uniform throughout

Question 5

A block of metal has a mass of 27.0 g and a volume of 3.00 mL. What is its density?

Accepted Answer

$$9.00\ 	ext{g/mL}$$

Question 6

Which of the following is a physical change?

Accepted Answer

Melting ice

Question 7

Express 0.00052 in scientific notation.

Accepted Answer

$$5.2 	imes 10$$^{-4}$$

Question 8

A patient weighs 164 lb. What is their mass in kilograms? (Use $$1\ 	ext{kg} = 2.20\ 	ext{lb})$$

Accepted Answer

$$74.5\ 	ext{kg}$$

Question 9

Which of the following is the correct formula to convert a temperature from Fahrenheit to Celsius?

Accepted Answer

$$T_C = \frac{T_F - 32}{1.8}$$

Question 10

A sample of water is heated from 20°C to 80°C. If the specific heat of water is $$4.184\ 	ext{J/g}^\circ	ext{C}$$, how much energy is required to heat 10.0 g of water?

Accepted Answer

$$2,510\ 	ext{J}$$

Question 11

Which of the following is a chemical change?

Accepted Answer

Burning gasoline in a car engine

Question 12

A solution contains 200 g of sugar dissolved in 100 mL of water at 40°C. According to the solubility graph, what will happen if the temperature is increased to 80°C?

Accepted Answer

More sugar can dissolve in the water

Question 13

Which prefix represents $$10^{-6}$$?

Accepted Answer

Micro

Question 14

A gold bar has a mass of 193 g and a volume of 10.0 mL. What is its density?

Accepted Answer

$$19.3\ 	ext{g/mL}$$

Question 15

Which of the following best describes the energy unit 'calorie' as used on food labels?

Accepted Answer

It is actually a kilocalorie ($$1\ 	ext{kcal} = 1000\ 	ext{cal})$$

Question 16

Which of the following is the correct formula for specific heat?

Accepted Answer

$$	ext{Specific heat} = \frac{	ext{heat}}{	ext{mass} 	imes \Delta T}$$

Question 17

A 50.0 g sample of iron ($$c = 0.450\ 	ext{J/g}^\circ	ext{C}) is $$heated from 25°C to 75°C. How much heat is absorbed?

Accepted Answer

$$1,125\ 	ext{J}$$

Question 18

Which of the following is a pure substance?

Accepted Answer

Copper

Question 19

Which of the following best explains why the temperature remains constant during the melting of ice?

Accepted Answer

The energy is used to overcome intermolecular forces, not to increase temperature

Question 20

A patient receives 500 mL of a glucose solution. How many liters is this?

Accepted Answer

$$0.500\ 	ext{L}$$

Measurements, Matter, and Energy: Study Notes for College Chemistry

Guida di studio - Domande di pratica

Study guide - Flashcard