Acids and Bases (Lesson 4)

What is the pH level of a substance that is considered an acid?

• 7

• 8.7

• 14

• 0

Which of the following substances turns litmus paper pink, indicating it is an acid?

• NaOH

• KOH

• HCl

• Ca(OH)₂

What is the likely reaction product when hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH)?

• NaCl + H₂O

• NaCl + CO₂

• NaCl + H₂

• NaCl + O₂

Which of the following is a base with a pH greater than 7?

• H₂SO₄

• HF

• KOH

• HCl

What is the expected product when sulfuric acid (H₂SO₄) reacts with potassium hydroxide (KOH)?

• K₂SO4 + H₂O

• KHSO₄ + KOH

• K₂SO₃ + H₂O₂

• K₂S + H₂O

Acids form​ (a)   when mixed with water, and they taste ​ (b)   .

Bases form ​ (c)   when mixed with water, and they taste ​ (d)   .

• H+
• sour
• OH-
• bitter

​ (a)   conduct electricity and turn litmus paper red.

• Acids
• Bases
• Neutral solutions
• Salts

Answer explanation

Acidic solutions conduct electricity and turn litmus paper red.

Tags

hsps1b

HS-PS1-B

When acids are mixed with water, they release ​ (a)   ions.

• hydrogen (H+)
• hydroxide (OH-)

Acids react with

• water to produce bases and salts
• salts to produce bases and water
• neither bases, salts nor water
• bases to produce salts and water

Which of the following is true about acids and bases?

• The lower the pH, the stronger the acid
• the higher the pH, the stronger the acid
• The lower the pH, the more neutral the acid
• The higher the pH, the weaker the base