Question 1

Which of the following best describes a compound?

Accepted Answer

A pure substance that can be broken down into simpler substances by chemical means.

Question 2

A sample of air is best classified as which of the following?

Accepted Answer

A homogeneous mixture

Question 3

Which of the following is an example of a physical change?

Accepted Answer

Melting of ice

Question 4

What is the correct formula to convert a temperature from Celsius to Kelvin?

Accepted Answer

$$T_K = T_C + 273$$

Question 5

A patient’s temperature is 102.2 °F. What is this temperature in degrees Celsius? (Use $$T_F = 1.8T_C + 32)$$

Accepted Answer

$$39.0\ ^\circ C$$

Question 6

Which of the following is NOT a unit of energy?

Accepted Answer

Gram (g)

Question 7

How many significant figures are in the measurement 0.004560?

Accepted Answer

4

Question 8

Which of the following is a chemical property?

Accepted Answer

Ability of iron to rust

Question 9

A 250.0 g sample of water is heated from 22.0 °C to 100.0 °C. If the specific heat of water is $$4.18\ \mathrm{J/g\ ^\circ C}$$, how much heat is absorbed?

Accepted Answer

$$81,950\ \mathrm{J}$$

Question 10

Which of the following best describes the process of sublimation?

Accepted Answer

A solid changing directly to a gas

Question 11

What is the volume of a rectangular solid with dimensions 2.0 cm × 3.0 cm × 4.0 cm?

Accepted Answer

$$24\ \mathrm{cm}^3$$

Question 12

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad dressing

Question 13

If a food contains 9 g of fat, 4 g of protein, and 12 g of carbohydrate, how many kilocalories does it provide? (Fat: 9 kcal/g, Protein: 4 kcal/g, Carbohydrate: 4 kcal/g)

Accepted Answer

$$113\ \mathrm{kcal}$$

Question 14

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

Accepted Answer

Micro ($$\mu)$$

Question 15

A sample has a mass of 15.0 g and a volume of 3.0 mL. What is its density?

Accepted Answer

$$5.0\ \mathrm{g/mL}$$

Question 16

Which of the following is an example of potential energy?

Accepted Answer

A stretched rubber band

Question 17

Which of the following statements about the scientific method is correct?

Accepted Answer

It involves making observations, forming a hypothesis, and conducting experiments.

Question 18

Convert $$3.5 	imes 10^4$ to standard notation.

Accepted Answer

35,000

Question 19

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 20

A heating curve shows a plateau at 100 °C for water. What is happening at this plateau?

Accepted Answer

The water is boiling and undergoing a change of state from liquid to gas.

Exam 1 Review: Chemistry in Our Lives, Measurements, Matter and Energy

Guida di studio - Domande di pratica

Study guide - Flashcard