Question 1

How many significant figures are in the number 0.04500?

Accepted Answer

4

Question 2

Express 0.006254 with three significant figures in scientific notation.

Accepted Answer

$$6.25 	imes 10$$^{-3}$$

Question 3

A patient weighing 4.2 kg is prescribed a dose of 250 $$\mug $$per kg of aspirin. How many milligrams of aspirin should be administered?

Accepted Answer

$$1.05 mg$$

Question 4

A gold crown increases the water level in a tank from 50.0 mL to 85.0 mL. If the crown's mass is 555 g, is it made of pure gold? (Density of gold = $$19.3 g/mL)$$

Accepted Answer

No, because its density is less than pure gold.

Question 5

How many milliliters of mercury (specific gravity = 13.6) have a mass of 0.65 kg?

Accepted Answer

$$47.8 mL$$

Question 6

Which of the following is a physical property shared by both liquids and gases?

Accepted Answer

Has randomly arranged particles

Question 7

Which of the following would NOT be a physical change?

Accepted Answer

Burning gasoline in a lawnmower

Question 8

Convert 180.1 meters to nanometers ($$1 m$$ = $$10^9 nm).$$

Accepted Answer

$$1.801 	imes 10$$^{8}$$ nm

Question 9

A patient needs to receive $$0.125 g of $$ampicillin. The solution contains $$200 mg $$per $$5.0 mL. $$How many mL are required?

Accepted Answer

$$2.5 mL$$

Question 10

Which classification best fits carbon dioxide?

Accepted Answer

Compound

Question 11

Convert $$104^\circF to$$ $$^\circC $$using the formula $$^\circC$$ = $$\frac{5}{9}( ^\circF$$ $$-32 ).$$

Accepted Answer

$$30^\circC$$

Question 12

How many calories are required to raise the temperature of a $$25.0 g $$sample of iron from $$35^\circC to$$ $$55^\circC$$? (Specific heat of iron = $$0.108$$ cal/g$$^\circC)$$

Accepted Answer

$$54.0$$ cal

Question 13

When $$20.0 g of$$ $$100^\circC$$ $$\mathrm{H_2O(g)} is $$converted into $$0^\circC$$ $$\mathrm{H_2O(s)}$$, how many kJ of heat will be released? (S.H. = $$4.184 J/g$^\circC$$, heat of vaporization = $$2260 J/g$$, heat of fusion = $$334 J/g)$$

Accepted Answer

$$-60.4 kJ$$

Question 14

Which of the following best describes a blueberry muffin?

Accepted Answer

Heterogeneous mixture

Question 15

Convert $$196^\circC to $$Kelvin using $$K = ^\circC + 273.$$

Accepted Answer

$$469 K$$

Question 16

Which of the following is the correct scientific notation for 23,456,789 rounded to three significant figures?

Accepted Answer

$$2.35 	imes 10$$^{7}$$

Question 17

Which of the following is a homogeneous mixture?

Accepted Answer

Coke

Question 18

How many significant figures are in the number 1.00001?

Accepted Answer

6

Question 19

650 J is equivalent to how many calories? (1 cal = 4.184 J)

Accepted Answer

155 cal

Question 20

What is the Celsius temperature for 298 K?

Accepted Answer

$$25^\circC$$

GOB Chemistry Practice Worksheet Guidance

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