Question 1

Which of the following best describes Avogadro’s number?

Accepted Answer

The number of particles in one mole of a substance, $$6.022 	imes 10$$^{23}$$

Question 2

A chemist has 1 mole of sodium chloride. How many formula units does this represent?

Accepted Answer

$$6.022 	imes 10$$^{23}$$

Question 3

Which of the following is a characteristic of Arrhenius acids?

Accepted Answer

They produce hydrogen ions $$(H^+) in $$water

Question 4

Which equation correctly represents the dissociation of hydrochloric acid in water?

Accepted Answer

$$HCl_{(g)} \rightarrow H^+_{(aq)} + Cl^-_{(aq)}$$

Question 5

Which of the following substances is an Arrhenius base?

Accepted Answer

NaOH

Question 6

What is the expected color change when blue litmus paper is placed in an acidic solution?

Accepted Answer

It turns red

Question 7

Which property is shared by both Arrhenius acids and bases?

Accepted Answer

They are electrolytes in water

Question 8

A solution feels slippery and turns phenolphthalein indicator pink. What type of solution is this?

Accepted Answer

Basic

Question 9

Which of the following is a correct statement about the taste and feel of acids and bases?

Accepted Answer

Acids taste sour and may sting; bases taste bitter and feel slippery

Question 10

Which of the following reactions is a neutralization reaction?

Accepted Answer

$$NaOH_{(aq)} + HCl_{(aq)} \rightarrow NaCl_{(aq)} + H_2O_{(l)}$$

Question 11

Which indicator turns pink in the presence of a base?

Accepted Answer

Phenolphthalein

Question 12

Which of the following best explains why acids are considered electrolytes?

Accepted Answer

They produce $$H^+$$ ions in water, which conduct electricity

Question 13

A student mixes NaOH with water. Which ions are present in the solution?

Accepted Answer

$$Na^+$$ and $$OH^-$$

Question 14

Which of the following is NOT a characteristic of Arrhenius bases?

Accepted Answer

They produce $$H^+$$ ions in water

Question 15

Which of the following best describes the role of acids in neutralization reactions?

Accepted Answer

They react with bases to form water and a salt

Question 16

A citrus fruit is tested with litmus paper. What result would you expect?

Accepted Answer

Litmus paper turns red

Question 17

Which of the following best explains why NaOH is considered an Arrhenius base?

Accepted Answer

It produces $$OH^-$$ ions in water

Question 18

Which of the following is a correct statement about the effect of acids on metals?

Accepted Answer

Acids corrode some metals

Question 19

A solution is colorless with phenolphthalein and turns red with litmus. What is the likely nature of the solution?

Accepted Answer

Acidic

Question 20

Which of the following best describes the difference between Arrhenius acids and bases?

Accepted Answer

Acids produce $$H^+$$ ions; bases produce $$OH^-$$ ions

Lecture 1st Counting Atoms, Acids, and Bases: Fundamental Concepts in GOB Chemistry

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