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

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

Question 1

Which of the following best describes a scientific theory?

Accepted Answer

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

Question 2

A student measures the mass of a sample as 0.00456 g. Express this measurement in scientific notation with the correct number of significant figures.

Accepted Answer

$$4.56 	imes 10$$^{-3}$$ g$

Question 3

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

Accepted Answer

Burning a piece of paper

Question 4

A sample of metal has a mass of 45.0 g and a volume of 15.0 mL. What is its density?

Accepted Answer

$$3.00\ \mathrm{g/mL}$$

Question 5

Which of the following statements about the Law of Conservation of Energy is correct?

Accepted Answer

Energy can neither be created nor destroyed, only transformed from one form to another.

Question 6

Which of the following is a pure substance?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 7

Which of the following best describes the difference between an atom and a molecule?

Accepted Answer

An atom is the smallest unit of an element, while a molecule is a group of atoms bonded together.

Question 8

A sample of water is heated from $$25^\circ\mathrm{C} to$$ $$75^\circ\mathrm{C}. If $$the mass of water is $$100.0\ \mathrm{g}$$ and the specific heat capacity is $$4.18\ \mathrm{J/g\cdot ^\circ C}$$, how much energy ($$q) is $$absorbed?

Accepted Answer

$$q = 20,900\ \mathrm{J}$$

Question 9

Which of the following is NOT one of the seven diatomic elements?

Accepted Answer

Carbon ($$\mathrm{C_2$})$$

Question 10

Convert a temperature of $$25^\circ\mathrm{C} to $$Kelvin.

Accepted Answer

$$298\ \mathrm{K}$$

Question 11

Which of the following best describes a mixture?

Accepted Answer

A physical combination of two or more substances that retain their own properties.

Question 12

Which of the following is a property of metals?

Accepted Answer

Malleable and ductile

Question 13

A student records the length of a metal rod as 12.30 cm. How many significant figures are in this measurement?

Accepted Answer

4

Question 14

Which of the following is a correct conversion factor for converting grams to kilograms?

Accepted Answer

$$1\ \mathrm{kg} = 1000\ \mathrm{g}$$

Question 15

Which of the following best describes a physical property?

Accepted Answer

Color

Question 16

A solution is prepared by dissolving 10.0 g of salt in 90.0 g of water. What is the total mass of the solution?

Accepted Answer

$$100.0\ \mathrm{g}$$

Question 17

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

Accepted Answer

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

Question 18

Which of the following is a correct statement about the kinetic energy of the three states of matter?

Accepted Answer

Gases have the highest kinetic energy, followed by liquids, then solids.

Question 19

Which of the following is the correct group name for the elements in Group 17 of the periodic table?

Accepted Answer

Halogens

Question 20

A 50.0 g sample of a substance is heated, and its temperature increases by $$10.0^\circ\mathrm{C}. If $$the specific heat capacity is $$2.00\ \mathrm{J/g\cdot ^\circ C}$$, how much energy was absorbed?

Accepted Answer

$$q = 1,000\ \mathrm{J}$$

Introduction to Chemistry: Study Guide for Chapters 1–4

Study Guide - Practice Questions

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