Question 1

Which of the following numbers is correctly written in scientific notation for 0.0000204?

Accepted Answer

$$2.04 	imes 10$$^{-5}$$

Question 2

Which of the following measured numbers has three significant figures?

Accepted Answer

2.04

Question 3

A solution contains 0.825 g of calcium carbonate. If the calcium carbonate solution contains $$1250 \ \mathrm{mg} of$$ $$\mathrm{$$CaCO_3$$}$$ per $$5.0 \ \mathrm{mL}$$, how many mL are required to supply $$0.825 \ \mathrm{g}$$?

Accepted Answer

3.3 mL

Question 4

There are 58 counties in California and about 560,000 people in each county. How many million people are in California?

Accepted Answer

32 million

Question 5

How many inches are in 32.8 cm? (1 in = 2.54 cm)

Accepted Answer

12.9 in

Question 6

How many pounds are in 8.5 kg? ($$1 \ \mathrm{kg} = 2.20 \ \mathrm{lb})$$

Accepted Answer

18.7 lb

Question 7

The density of a certain type of steel is $$9.2 \ \mathrm{g/cm^3$}. $$What is the mass of $$100.0 \ \mathrm{cm^3$}$$ chunk of this steel?

Accepted Answer

$$920 \ \mathrm{g}$$

Question 8

A solution has a density of $$1.22 \ \mathrm{g/mL}. $$What volume of solution has a mass of $$95.7 \ \mathrm{g}$$?

Accepted Answer

$$78.4 \ \mathrm{mL}$$

Question 9

Which of the following is the SI unit of temperature?

Accepted Answer

kelvin

Question 10

What is the correct answer for the operation $$(4.51 + 7.82)/1.7$$ with the correct number of significant figures?

Accepted Answer

7.3

Question 11

A temperature of $$67^{\circ}$$\mathrm{F}$$ is the same as approximately how many kelvin?

Accepted Answer

$$292 \ \mathrm{K}$$

Question 12

The atomic number of an element represents:

Accepted Answer

The number of protons in an atom of the element.

Question 13

Which of the following elements is chemically similar to calcium?

Accepted Answer

strontium

Question 14

Which of the following is NOT a correct name, symbol combination?

Accepted Answer

potassium, P

Question 15

What is the conversion factor for the relationship between millimeters and meters?

Accepted Answer

$$1000 \ \mathrm{mm} / 1 \ \mathrm{m}$$

Question 16

A neutron has an electrical charge of:

Accepted Answer

0

Question 17

A patient needs $$0.032 \ \mathrm{g} of a $$sulfa drug. There are $$8 \ \mathrm{mg}$$ tablets in stock. How many tablets should be given?

Accepted Answer

4 tablets

Question 18

What is the specific heat in $$\mathrm{J/g$$^{\circ}$$C} of $$sodium if $$92.3 \ \mathrm{J} is $$needed to raise the temperature of $$3.00 \ \mathrm{g}$$ sodium by $$25.0^{\circ}$$\mathrm{C}$$?

Accepted Answer

$$1.23 \ \mathrm{J/g$$^{\circ}$$C}$$

Question 19

Convert $$134 \ \mathrm{J} to$$ $$\mathrm{kJ}.$$

Accepted Answer

$$0.0134 \ \mathrm{kJ}$$

Question 20

Which of the following is a physical change?

Accepted Answer

Silk fibers can be digested by moths.

Introduction to Chemistry: Practice Exam I Study Guidance

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