S4 Acids and bases

What does the pH scale indicate?

• The concentration of H⁺ ions

• The temperature of a solution

• The color of a solution

• The volume of a solution

What is the pH of acidic solutions?

• Less than 7

• Equal to 7

• More than 7

• Exactly 10

What happens when you dilute an acid?

• H⁺ ion concentration decreases

• H⁺ ion concentration increases

• OH⁻ ion concentration decreases

• OH⁻ ion concentration increases

What do non-metal oxides form when they dissolve in water?

• Acids

• Bases

• Salts

• Metals

What is the chemical opposite of an acid?

• Base

• Salt

• Water

• Metal

What is a neutralisation reaction?

• Cancelling an acid or a base with its chemical opposite

• Mixing two acids together

• Heating a base

• Cooling an acid

What are salts considered to be?

• Neutral substances

• Acidic substances

• Basic substances

• Metallic substances

What are the two parts of a salt's name derived from?

• The base and the acid used

• The color and the taste

• The smell and the texture

• The temperature and the pressure

What gas do all acids produce at the negative electrode?

• H2 gas

• O2 gas

• CO2 gas

• N2 gas

What is a solution with an accurately known concentration called?

• Standard solution

• Basic solution

• Neutral solution

• Acidic solution