Q: A sample of water is heated from 20°C to 80°C. If the mass of water is 100 g and the specific heat is $$4.18 \ \mathrm{J/g$$^{\ast}$$C}$$, how much energy is absorbed?

$$q = 100 \times 4.18 \times (80-20) = 25,080 \ \mathrm{J}$$

Q: A sample contains 3 isotopes of element X: X-10 (20%), X-11 (50%), and X-12 (30%). What is the average atomic mass?

$$10 \times 0.20 + 11 \times 0.50 + 12 \times 0.30 = 11.1$$

Q: Which of the following is the correct conversion factor to convert 5.0 L to mL?

$$5.0 \ \mathrm{L} \times \frac{1000 \ \mathrm{mL}}{1 \ \mathrm{L}} = 5000 \ \mathrm{mL}$$

Q: Which of the following is the correct formula for calculating density?

$$\text{Density} = \frac{\text{mass}}{\text{volume}}$$

Question 1

Which of the following statements best describes a scientific theory?

Accepted Answer

A well-tested explanation for a broad set of observations.

Question 2

Which of the following is the correct conversion from 25°C to Kelvin?

Accepted Answer

$$K = 25 + 273 = 298$$

Question 3

A patient is prescribed 500 mg of a medication. If the available tablets are 0.25 g each, how many tablets should the patient take? (1 g = 1000 mg)

Accepted Answer

2 tablets

Question 4

Which of the following is NOT a base SI unit?

Accepted Answer

Gram (g)

Question 5

A sample of water is heated from 20°C to 80°C. If the mass of water is 100 g and the specific heat is $$4.18 \ \mathrm{J/g$$^{\ast}$$C}$$, how much energy is absorbed?

Accepted Answer

$$q = 100 	imes 4.18 	imes (80-20) = 25,080 \ \mathrm{J}$$

Question 6

Which of the following is the correct scientific notation for 0.00056?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 7

Which of the following is a physical property?

Accepted Answer

Color

Question 8

A nutrition label states that a food sample contains 9 kcal of energy. How many Calories (Cal) does this represent?

Accepted Answer

9 Cal

Question 9

Which of the following is the correct order of steps in the scientific method?

Accepted Answer

Observation, hypothesis, experiment, theory

Question 10

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 11

A student measures the mass of a sample three times and gets values of 2.01 g, 2.00 g, and 2.02 g. The true value is 2.50 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 12

Which of the following is the correct formula for energy conversion from calories to joules?

Accepted Answer

$$1 \ \mathrm{cal} = 4.184 \ \mathrm{J}$$

Question 13

Which of the following is a correct example of a chemical change?

Accepted Answer

Burning of wood

Question 14

A sample contains 3 isotopes of element X: X-10 (20%), X-11 (50%), and X-12 (30%). What is the average atomic mass?

Accepted Answer

$$10 	imes 0.20 + 11 	imes 0.50 + 12 	imes 0.30 = 11.1$$

Question 15

Which of the following is the correct conversion factor to convert 5.0 L to mL?

Accepted Answer

$$5.0 \ \mathrm{L} 	imes \frac{1000 \ \mathrm{mL}}{1 \ \mathrm{L}} = 5000 \ \mathrm{mL}$$

Question 16

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 17

Which of the following is the correct formula for calculating density?

Accepted Answer

$$	ext{Density} = \frac{	ext{mass}}{	ext{volume}}$$

Question 18

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 19

A solution contains 0.5 mol of NaCl in 250 mL of solution. What is the molarity of the solution?

Accepted Answer

$$M = \frac{0.5}{0.250} = 2.0 \ \mathrm{M}$$

Question 20

Which of the following is the correct order of electromagnetic radiation from lowest to highest energy?

Accepted Answer

Radio waves, visible light, ultraviolet, gamma rays

Test 1 Study Guide: Chemistry in Our Lives, Measurements, Matter, and Atoms

Guida di studio - Domande di pratica

Study guide - Flashcard