Question 1

Which of the following best describes the difference between a physical and a chemical change? Choose the correct example for each.

Accepted Answer

A physical change does not alter the basic identity of a substance, while a chemical change transforms it into a different substance. Example: Melting ice (physical), burning wood (chemical).

Question 2

Which of the following is an example of an intensive property?

Accepted Answer

Boiling point

Question 3

A sample of sea water contains 28.0 g of NaCl per liter. What is the molarity of NaCl in sea water? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$0.479\ \mathrm{M}$$

Question 4

Which scientist is credited with the law of conservation of mass and is often called the 'Father of Chemistry'?

Accepted Answer

Antoine Lavoisier

Question 5

Which of the following best describes a plasma?

Accepted Answer

A state of matter with freely moving charged particles, formed at high temperatures

Question 6

How many moles of NaCl are contained in 100.0 mL of a 0.200 M solution?

Accepted Answer

$$0.0200\ \mathrm{mol}$$

Question 7

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 8

Which of the following compounds is named correctly?

Accepted Answer

N2O3: dinitrogen trioxide

Question 9

How many grams of Na2HPO4 are in 1.75 L of a 0.460 M solution? (Molar mass Na2HPO4 = 141.96 g/mol)

Accepted Answer

$$114\ \mathrm{g}$$

Question 10

Which of the following best explains why the ratio of Na to Cl in NaCl is 1:1?

Accepted Answer

Because Na+ and Cl- combine in a 1:1 ratio to balance their charges

Question 11

Which of the following is a polyatomic ion?

Accepted Answer

NO3-

Question 12

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

Accepted Answer

Salt dissolved in water

Question 13

Which historical figure is credited with devising the first comprehensive atomic theory in the 1800s?

Accepted Answer

John Dalton

Question 14

What is the correct formula for chromium(III) phosphide?

Accepted Answer

$$\mathrm{Cr}_3\mathrm{P}_2$$

Question 15

Which of the following best describes the arrangement of particles in a solid, liquid, and gas?

Accepted Answer

Solid: closely packed, Liquid: closely packed but can move, Gas: far apart

Question 16

How would you prepare 0.80 L of 0.15 M isotonic saline from a 6.0 M NaCl stock solution?

Accepted Answer

Add $$0.020\ \mathrm{L} (20 mL) of $$stock solution to enough water to make 0.80 L

Question 17

Which of the following is an extensive property?

Accepted Answer

Mass

Question 18

Which of the following is the correct formula for dinitrogen monoxide?

Accepted Answer

$$\mathrm{N}_2\mathrm{O}$$

Question 19

Which of the following best describes the Law of Octaves as proposed by John Newlands?

Accepted Answer

Elements are arranged so that every eighth element has similar properties

Question 20

Which of the following is the correct formula for manganese(II) phosphate?

Accepted Answer

$$\mathrm{Mn}_3(\mathrm{PO}_4)_2$$

Introduction to Chemistry: Matter, Properties, History, and Nomenclature

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