Q: Which of the following is the correct equality for the prefix 'milli-'?

$$1 \text{ g} = 1000 \text{ mg}$$

Q: Which of the following statements about density is correct?

Density is calculated as $$\text{density} = \frac{\text{mass}}{\text{volume}}$$

Q: What is the specific heat if 24.8 g of a metal absorbs 275 J of energy and the temperature rises from $$20.2^{\circ}$$\text{C}$$ to 24.5$$^{\circ}$$\text{C}$$?

$$2.6 \text{ J/g}^{\circ}\text{C}$$

Question 1

Which of the following best defines chemistry?

Accepted Answer

The study of the composition, structure, properties, and reactions of matter.

Question 2

Which of the following is NOT considered matter?

Accepted Answer

Sunlight

Question 3

A forensic scientist analyzes a blood sample to determine the presence of drugs. Which step of the scientific method does this represent?

Accepted Answer

Experiment

Question 4

Which of the following is an example of an exact number?

Accepted Answer

The number of eggs in a carton

Question 5

What is the correct scientific notation for 0.00086?

Accepted Answer

$$8.6 	imes 10$$^{-4}$$

Question 6

A solution is prepared by dissolving 5.0 g of salt in 100 mL of water. Which of the following best describes this system?

Accepted Answer

A homogeneous mixture

Question 7

Which of the following is a chemical property?

Accepted Answer

Ability to rust

Question 8

Convert 2.44 meters to centimeters using the appropriate conversion factor.

Accepted Answer

244 cm

Question 9

Which of the following is the correct equality for the prefix 'milli-'?

Accepted Answer

$$1 	ext{ g} = 1000 	ext{ mg}$$

Question 10

A patient is prescribed 0.150 mg of medication. If each tablet contains 75 mcg, how many tablets are required?

Accepted Answer

2 tablets

Question 11

Which of the following statements about density is correct?

Accepted Answer

Density is calculated as $$	ext{density} = \frac{	ext{mass}}{	ext{volume}}$$

Question 12

A 48.0-g sample of metal raises the water level in a graduated cylinder from 25.0 mL to 33.0 mL. What is the density of the metal?

Accepted Answer

$$6.0 	ext{ g/mL}$$

Question 13

Which of the following is a physical change?

Accepted Answer

Melting ice

Question 14

What is the temperature in Kelvin for normal body temperature (37°C)?

Accepted Answer

310 K

Question 15

How many calories are equivalent to 150 J of energy? ($$1 	ext{ cal} = 4.184 	ext{ J})$$

Accepted Answer

36 cal

Question 16

A cup of whole milk contains 13 g carbohydrate, 9.0 g fat, and 9.0 g protein. Using the energy values $$4 	ext{ kcal/g}$$ for carbohydrate and protein, $$9 	ext{ kcal/g}$$ for fat, how many kilocalories does the milk contain?

Accepted Answer

170 kcal

Question 17

What is the specific heat if 24.8 g of a metal absorbs 275 J of energy and the temperature rises from $$20.2^{\circ}$$	ext{C}$$ to 24.5$$^{\circ}$$	ext{C}$$?

Accepted Answer

$$2.6 	ext{ J/g}^{\circ}	ext{C}$$

Question 18

How many kilojoules are released when 50.0 g of steam condenses at $$100^{\circ}$$	ext{C}$$? (Heat of condensation for water is 2260$$ 	ext{ J/g}$$)

Accepted Answer

113 kJ

Question 19

Which of the following best describes a plateau (horizontal line) on a heating curve?

Accepted Answer

A constant temperature and a change of state

Chemistry in Our Lives, Measurements, and Matter: Foundations for General, Organic, and Biological Chemistry

Guida di studio - Domande di pratica

Study guide - Flashcard