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 statements best describes the difference between a physical and a chemical property?

Accepted Answer

A physical property can be observed without changing the identity of the substance, while a chemical property involves a change in the substance's identity.

Question 2

A student measures the mass of a sample as 12.305 g. How many significant figures are in this measurement?

Accepted Answer

5

Question 3

Which of the following is the correct scientific notation for the number 0.000456?

Accepted Answer

$$4.56 	imes 10$$^{-4}$$

Question 4

Which of the following is an example of an endothermic process?

Accepted Answer

Melting of ice to form liquid water

Question 5

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

Accepted Answer

$$3.0 \ \mathrm{g/mL}$$

Question 6

Which of the following is the correct formula for a binary ionic compound formed between magnesium and chlorine?

Accepted Answer

$$\mathrm{$$MgCl_2$$}$$

Question 7

Convert 25.0 °C to Kelvin.

Accepted Answer

$$298.15 \ \mathrm{K}$$

Question 8

Which of the following elements is a non-metal?

Accepted Answer

Oxygen ($$\mathrm{O})$$

Question 9

A chemical reaction releases heat to its surroundings. What type of reaction is this?

Accepted Answer

Exothermic

Question 10

Which of the following is the correct symbol for the element potassium?

Accepted Answer

$$\mathrm{K}$$

Question 11

If a solution contains $$0.50 \ \mathrm{mol} of $$solute in $$250 \ \mathrm{mL} of $$solution, what is its molarity?

Accepted Answer

$$2.0 \ \mathrm{M}$$

Question 12

Which of the following is the correct charge for a chloride ion?

Accepted Answer

$$-1$$

Question 13

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring contradictory evidence

Question 14

Which of the following is the correct conversion factor to change $$1 \ \mathrm{cm^3$} to$$ $$\mathrm{mL}$$?

Accepted Answer

$$1 \ \mathrm{cm^3$} = 1 \ \mathrm{mL}$$

Question 15

Which of the following ions has the same electron configuration as neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 16

A student needs to convert $$5.0 \ \mathrm{km} to $$meters using dimensional analysis. What is the correct answer?

Accepted Answer

$$5000 \ \mathrm{m}$$

Question 17

Which of the following best describes a diatomic element?

Accepted Answer

An element that exists as molecules composed of two atoms

Question 18

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

Accepted Answer

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

Question 19

Which of the following is the correct symbol for the element with atomic number 8?

Accepted Answer

$$\mathrm{O}$$

Question 20

A compound is formed from aluminum and oxygen. What is the correct formula for this compound?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Exam 1 Study Guide: Introduction to Chemistry Core Concepts

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