Compound and Mixture

Which of the following is a compound?

• Oxygen (O₂)

• Water (H₂O)

• Gold (Au)

• Iron (Fe)

What is the main difference between a compound and a mixture?

• Compounds are physically combined

• Mixtures are chemically bonded

• Compounds need chemical methods to separate

• Mixtures have a fixed ratio

Which of these is a mixture?

• Salt (NaCl)

• Carbon dioxide (CO₂)

• Fruit salad

• Glucose (C₆H₁₂O₆)

What is the property of mixtures?

• Fixed ratio of elements

• New properties different from components

• Easy to separate by physical methods

• Always made of two elements only

Air is an example of…

Why does a compound have properties different from its elements?

• Because elements remain unchanged

• Because they are chemically bonded

• Because compounds have no ratio

• Because compounds are always gases

Which of the following best describes mineral water?

• Pure water only

• Compound

• Mixture of water and dissolved minerals

• Element

Which is NOT a correct property of compounds?

• Fixed ratio of elements

• Requires chemical reaction to separate

• Substances keep original properties

• New properties different from elements

In a mixture, the components…

• Lose their original properties

• Can only be separated chemically

• Keep their original properties

• Always form new substances

Which of the following explains why salt water is a mixture and not a compound?

• The ratio of salt and water is fixed

• Salt and water are chemically bonded

• Salt and water can be separated by physical methods

• It has completely new properties