Q: Which of the following pairs of measurements are equivalent in length?

$$7.2 \times 10^2$ \text{ mm}$$ \,\text{and}\, 0.72 \text{ m}$

Question 1

Which of the following pairs of measurements are equivalent in length?

Accepted Answer

$$7.2 	imes 10^2$ 	ext{ mm}$$ \,	ext{and}\, 0.72 	ext{ m}$

Question 2

Which of the following statements about density is FALSE?

Accepted Answer

If you have 1 mL of iron and 1 mL of lead, the piece of iron would have a greater mass.

Question 3

A patient is prescribed 81 mg aspirin tablets. How many tablets can be made from $$1.21 	ext{ kg} of $$aspirin?

Accepted Answer

$$1.5 	imes 10^4$ tablets

Question 4

Which of the following is a correct conversion for the boiling point of liquid nitrogen ($$77 	ext{ K}) to $$degrees Fahrenheit ($$^\circ	ext{F}$$)?

Accepted Answer

$$-321^\circ	ext{F}$$

Question 5

Which of the following statements about physical and chemical changes is FALSE?

Accepted Answer

Chemical reactions are always chemical changes.

Question 6

Which of the following statements regarding temperature is FALSE?

Accepted Answer

Absolute zero is equivalent to a temperature of $$-273^\circ	ext{K}.$$

Question 7

A rental car in France has a mileage rating of $$28.3 	ext{ km/L}. $$Convert this mileage to feet per gallon ($$	ext{ft/gal}).$$

Accepted Answer

$$3.52 	imes 10^4$

Question 8

Which of the following is NOT a postulate of Dalton's atomic theory?

Accepted Answer

Atoms are divisible into protons, neutrons, and electrons.

Question 9

Which of the following substances is a mixture?

Accepted Answer

Brass

Question 10

Which statement is correct regarding the isotopes $$^{12}	ext{C}$$ and $$^{13}	ext{C}$$?

Accepted Answer

They have the same number of protons and electrons, but a different number of neutrons.

Question 11

Which particle was discovered through experiments with cathode ray tubes?

Accepted Answer

Electron

Question 12

Which of the following ions has an INCORRECT charge?

Accepted Answer

$$	ext{Mg}^+$$

Question 13

Which of the following statements regarding endothermic and exothermic processes is FALSE?

Accepted Answer

The evaporation of water from your skin after swimming is an exothermic process.

Question 14

Which of the following is a correct statement about the gas laws?

Accepted Answer

The pressure of a sample of gas is always directly proportional to the temperature of the gas.

Question 15

Which of the following is NOT a property of mixtures?

Accepted Answer

Mixtures are always homogeneous.

Question 16

Which of the following is the correct order for elements listed in the modern periodic table?

Accepted Answer

In order of increasing atomic number

Question 17

Which of the following isotopes has 7 protons and 8 neutrons?

Accepted Answer

$$^{15}	ext{N}$$

Question 18

Which of the following equations incorrectly represents the formation of a stable ion?

Accepted Answer

$$	ext{S} ightarrow 	ext{S}^{2-} + 2e^-$$

Question 19

A bag of potato chips has 2 servings, and each serving contains 215 Calories. If Leon eats 2 bags of chips, how many kilojoules of energy will he consume? ($$1 	ext{ Calorie} = 4.184 	ext{ kJ})$$

Accepted Answer

$$3.60 	imes 10^3$ kJ

Question 20

Which of the following statements about atomic mass is TRUE?

Accepted Answer

Atomic mass is the weighted average of the masses of the isotopes of an element.

Introduction to Chemistry: Key Concepts, Calculations, and Practice Questions

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