Q: A student measures the mass of a liquid as 25.0 g and its volume as 10.0 mL. What is the density of the liquid, and how many significant figures should the answer have?

$$2.50\ \text{g/mL}$$, 3 significant figures

Q: A student wants to convert $$34\ \text{lb} to $$kilograms using the equivalence $$1\ \text{kg} = 2.205\ \text{lb}. $$What is the correct setup and answer?

$$34\ \text{lb} \times \frac{1\ \text{kg}}{2.205\ \text{lb}} = 15.4\ \text{kg}$$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting when exposed to air

Question 2

A student measures the mass of a liquid as 25.0 g and its volume as 10.0 mL. What is the density of the liquid, and how many significant figures should the answer have?

Accepted Answer

$$2.50\ 	ext{g/mL}$$, 3 significant figures

Question 3

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Chocolate chip cookie

Question 4

Convert $$0.000985 to $$scientific notation.

Accepted Answer

$$9.85 	imes 10$$^{-4}$$

Question 5

Which statement about energy is correct according to the study materials?

Accepted Answer

Energy is conserved and a site of lower energy is more stable.

Question 6

A student wants to convert $$34\ 	ext{lb} to $$kilograms using the equivalence $$1\ 	ext{kg} = 2.205\ 	ext{lb}. $$What is the correct setup and answer?

Accepted Answer

$$34\ 	ext{lb} 	imes \frac{1\ 	ext{kg}}{2.205\ 	ext{lb}} = 15.4\ 	ext{kg}$$

Question 7

Which of the following is NOT a physical property?

Accepted Answer

Reaction with acid

Question 8

What is the correct formula for converting Celsius to Fahrenheit?

Accepted Answer

$$F = (C 	imes 1.8) + 32$$

Question 9

Which of the following statements about scientific theories and laws is correct?

Accepted Answer

A theory is a universally accepted explanation that can be refined with new evidence.

Question 10

A sample of water is heated from $$20^\circ 	ext{C} to$$ $$100^\circ 	ext{C}. $$Which physical changes occur during this process?

Accepted Answer

Boiling only

Question 11

Which of the following is a correct statement about significant figures in calculations?

Accepted Answer

When multiplying or dividing, the answer should have the same number of significant figures as the data with the fewest significant figures.

Question 12

Which of the following is a derived unit in the SI system?

Accepted Answer

Liter

Question 13

A student records a measurement as $$0.222. $$How many significant figures are present in this number?

Accepted Answer

3

Question 14

Which of the following best describes plasma as a state of matter?

Accepted Answer

A hot ionized gas with equal numbers of positive ions and electrons

Question 15

What is the mass of $$250\ 	ext{mL} of a $$liquid with a density of $$1.20\ 	ext{g/mL}$$?

Accepted Answer

$$300\ 	ext{g}$$

Question 16

Which of the following is an example of a compound?

Accepted Answer

Water ($$H_2O)$$

Question 17

Convert $$1390^\circ 	ext{C} to $$Kelvin.

Accepted Answer

$$1663\ 	ext{K}$$

Question 18

Which prefix represents $$10^{-6} in $$the SI system?

Accepted Answer

Micro

Question 19

A student needs to convert $$1500\ 	ext{yd} to $$miles using $$1\ 	ext{mile} = 1760\ 	ext{yd}. $$What is the correct answer?

Accepted Answer

$$0.852\ 	ext{miles}$$

Question 20

Which of the following is true about mixtures?

Accepted Answer

Mixtures can be separated into pure substances.

Matter, Measurement, and Problem Solving: Foundations of General Chemistry

Guida di studio - Domande di pratica

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