Q: Which of the following is the correct equation for density?

$$\text{Density} = \frac{\text{Mass}}{\text{Volume}}$$

Question 1

Which of the following best describes a chemical property?

Accepted Answer

The ability of iron to rust when exposed to oxygen

Question 2

A student measures the mass of a sample as 12.30 g and its volume as 4.1 mL. What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

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

Question 3

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

Accepted Answer

A salad with lettuce, tomatoes, and cucumbers

Question 4

Convert $$0.00567$$ meters to micrometers ($$\mum).$$

Accepted Answer

$$5,670\ \mu\mathrm{m}$$

Question 5

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

Accepted Answer

A law describes what happens; a theory explains why it happens.

Question 6

A patient’s temperature is measured as $$39.0\ ^\circ\mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$312.2\ \mathrm{K}$$

Question 7

Which of the following is the correct scientific notation for the number $$0.000482$$?

Accepted Answer

$$4.82 	imes 10$$^{-4}$$

Question 8

A sample of metal has a mass of $$45.0\ \mathrm{g}$$ and displaces $$15.0\ \mathrm{mL} of $$water in a graduated cylinder. What is the density of the metal?

Accepted Answer

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

Question 9

Which of the following is a physical change?

Accepted Answer

Ice melting to form liquid water

Question 10

A solution is prepared by dissolving $$5.00\ \mathrm{g} of $$NaCl in enough water to make $$250.0\ \mathrm{mL} of $$solution. What is the concentration of NaCl in $$\mathrm{g/mL}$$?

Accepted Answer

$$0.0200\ \mathrm{g/mL}$$

Question 11

Which of the following is the correct metric unit for measuring temperature?

Accepted Answer

Kelvin

Question 12

A calorimeter is used to measure which of the following?

Accepted Answer

The heat change in a chemical or physical process

Question 13

Which of the following is the correct equation for density?

Accepted Answer

$$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}}$$

Question 14

A block of ice at $$0\ ^\circ\mathrm{C}$$ absorbs $$334\ \mathrm{J/g} of $$heat to melt completely. What is this value called?

Accepted Answer

Heat of fusion

Question 15

Which of the following is a correct conversion factor for converting kilometers to meters?

Accepted Answer

$$\frac{1000\ \mathrm{m}}{1\ \mathrm{km}}$$

Question 16

A student records the following measurements: $$2.50\ \mathrm{g}$$, $$2.5\ \mathrm{g}$$, $$2.500\ \mathrm{g}$$, and $$2.5000\ \mathrm{g}. $$Which measurement has the greatest number of significant figures?

Accepted Answer

$$2.5000\ \mathrm{g}$$

Question 17

Which of the following best describes the difference between an element and a compound?

Accepted Answer

An element contains only one type of atom, while a compound contains two or more types of atoms chemically bonded.

Question 18

A sample of water is heated from $$25.0\ ^\circ\mathrm{C} to$$ $$75.0\ ^\circ\mathrm{C}. If $$the mass of water is $$100.0\ \mathrm{g}$$ and the specific heat of water is $$4.18\ \mathrm{J/g\cdot ^\circ C}$$, how much heat is absorbed?

Accepted Answer

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

Question 19

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

Accepted Answer

Solids have a definite shape and volume, liquids have a definite volume but no definite shape, and gases have neither definite shape nor volume.

Question 20

Which of the following is the correct formula to convert Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

GOB Chemistry Study Guide: Fundamental Concepts, Measurements, and Matter

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