Pre-test

When dissolved in water, acid will produce...

• Hydroxide ion
• Hydrogen ion
• Salt
• Bases

Explain what happens when a strong acid and a strong bases is pored in a same container.

• They will separate into layers
• Explosion will occur
• They will react chemically to form salt
• They will mix physically but not chemically

Which of the following is true about acid and bases?

• The lower the ph value, the stronger the acid
• The higher the ph value, the weaker the bases
• The lower the ph value, it will be neutralized
• The higher the ph value, the weaker the acid

Which of the following is known as strong acid? 

• Ammonia
• Sodium hydroxide
• Carbon dioxide
• Hydrochloric acid

What is the product of titration process?

• Water and salt
• From colourless to pink
• The ph value is 0
•  Neutralization occur

An acid will not shows its chemical properties with the absence of ...

• Titration
• Salt
• Water
• Bases

Toothpaste is a base. What is the ph value of the toothpaste?

• ph 8
• ph 7
• ph 5
• ph 1

Elizabeth has a substance in a beaker. She want to the ph value of the substance. So, she put a piece of red litmus paper on it. The litmus paper stay red. The substance in the beaker is...

• neutral
• an acid
• titration
• a base

What is the example of diprotic acid?

• Sodium hydroxide, NaOH
• Hydrochloric acid, HCl
• Potassium hydroxide, KOH
• Sulphuric acid, H₂ SO₄

Give the properties of detergent if the ph value is 11 

• Turn litmus paper from blue to red
• Sour taste
• soapy feels
• Change the colour from colourless to pink