Chemistry Chapter 4 test

Which of the following are method to prevent rusting

i. Heat metal

ii. Painting

iii. Coat with zinc

iv. Coat with oil

• i,ii,iii

• ii,iii,iv

• i,ii,iv

• iii,iv

Which of the following is TRUE for chemical reaction?

• a change of appearance

• possible explanation that is based on evidence

• happen on the surface of metal

• atoms rearrange and join together differently

Nickel compound is added with Sodium Hydroxide solution to form precipitate. What is the colour of the precipitate?

• brown

• black

• light green

• blue

Zinc + Hydrochloric acid --> Zinc chloride + Hydrogen

Which of the following is the reactant?

i. Zinc

ii. Hydrochloric acid

iii. Zinc chloride

iv. Hydrogen

• i,ii

• i,iii

• ii,iv

• iii,iv

Which alloy of iron resist corrosion?

• cast iron

• stainless steel

• carbon steel

• steel

If there is 2 atom of oxygen in the reactant, what is the number of oxygen atom in the product?

• 1

• 2

• 3

• 4

What is the meaning of this symbol?

What is Chemical Reaction?

What is the mass of Iron that react with 32g of oxygen and 18g of water to form 100g of hydrated iron oxide?

Write down two sign of chemical reaction