Chemistry CDF Test

Changes can be divided into ______ types

• Three

• Two

• Six

• Four

No new substances are formed in these ________ changes.

Chemical changes are __________ & ___________ .

• Physical

• Permanent

• Irreversible

• Both 2 & 3 are correct

________ causes breakdown of complex molecules of carbohydrates, fats and proteins into smaller molecules.

• Boiling

• Condensing

• Cooking

• None of these

___________ like fungi and bacteria produce enzymes which break down complex organic compounds into smaller substances.

Decay of Organic Substances are also regarded as a ______ reaction.

• Decomposition

• Neutralization

• Both of these

• None of these

Some substances can be obtained in pure state from their solutions by __________ .

• Neutralization

• Crystallization

• Distillation

• Condensation

The process of conversion of iron into iron oxide is called _________ .

The process of coating a thin layer of molten zinc on iron objects is called ________.

• Distillation

• Neutralization

• Galvanization

• None of these

_________ is a mixture of Iron , chromium , nickel and Manganese with carbon.