Quiz about Science - Reactivity Grade 9, Chemistry

Question 1

Choose the displacement reaction

Accepted Answer

Fe + CuSO4 --> Cu + FeSO4

Answer

Zn + 2HCl --> ZnCl2 + H2

Answer

CuO + H2SO4 --> CuSO4 + H2O

Answer

H2SO4 + CaCO3 --> CaSO4 + H2O + CO2

Question 2

Choose the acid + metal reaction

Accepted Answer

Zn + 2HCl --> ZnCl2 + H2

Answer

Fe + CuSO4 --> Cu + FeSO4

Answer

CuO + H2SO4 --> CuSO4 + H2O

Answer

H2SO4 + CaCO3 --> CaSO4 + H2O + CO2

Question 3

Choose the acid + metal oxide reaction

Accepted Answer

CuO + H2SO4 --> CuSO4 + H2O

Answer

Fe + CuSO4 --> Cu + FeSO4

Answer

Zn + 2HCl --> ZnCl2 + H2

Answer

H2SO4 + CaCO3 --> CaSO4 + H2O + CO2

Question 4

Choose the acid + (metal) carbonate reaction

Accepted Answer

H2SO4 + CaCO3 --> CaSO4 + H2O + CO2

Answer

Fe + CuSO4 --> Cu + FeSO4

Answer

Zn + 2HCl --> ZnCl2 + H2

Answer

CuO + H2SO4 --> CuSO4 + H2O

Question 5

The metal was heated in air; it reacted slowly to form an oxide.

The metal was placed in water; there was no reaction.

The metal was placed in dilute acid; there was a reaction with bubbles of gas being given off slowly.

Which metal is it?

Accepted Answer

zinc

Answer

magnesium

Answer

copper

Answer

silver

Question 6

The metal was heated in air; it reacted slowly to form an oxide.

The metal was placed in water; there was no reaction.

The metal was placed in dilute acid; there was no reaction.

Which metal is it?

Accepted Answer

copper

Answer

magnesium

Answer

zinc

Answer

silver

Question 7

The metal was heated in air; it burned brightly to form an oxide.

The metal was placed in water; there was a slow reaction to from a hydroxide.

The metal was placed in dilute acid; there was a vigorous reaction.

Which metal is it?

Accepted Answer

magnesium

Answer

zinc

Answer

copper

Answer

silver

Question 8

The metal was heated in air; there was no reaction.

The metal was placed in water; there was no reaction.

The metal was placed in dilute acid; there was no reaction.

Which metal is it?

Accepted Answer

silver

Answer

magnesium

Answer

zinc

Answer

copper

Question 9

When some students made the salt magnesium chloride, they reacted a piece of magnesium with hydrochloric acid in a beaker. When the reaction finished, they poured the solution into an evaporating basin and heated it. After heating it for a short time, they removed it from the heat and left the solution to

evaporate completely.

What risks are there in carrying out this experiment?

Accepted Answer

hot liquid "spitting"

Accepted Answer

acid is dangerous

Answer

magnesium is toxic

Answer

hydrogen gas is toxic

Question 10

When some students made the salt magnesium chloride, they reacted a piece of magnesium with hydrochloric acid in a beaker. When the reaction finished, they poured the solution into an evaporating basin and heated it. After heating it for a short time, they removed it from the heat and left the solution to

evaporate completely.

How should the students overcome the risks?

Accepted Answer

wear safety glasses, lab coat and gloves

Accepted Answer

don't stand too close

Accepted Answer

be careful when pouring

Question 11

Which metal is the most reactive?

Accepted Answer

potassium

Answer

sodium

Answer

silver

Answer

zinc

Question 12

Which metal is the least reactive?

Accepted Answer

silver

Answer

sodium

Answer

potassium

Answer

zinc

Question 13

Which metal is the most reactive?

Accepted Answer

calcium

Answer

magnesium

Answer

iron

Answer

gold

Question 14

Which metal is the least reactive?

Accepted Answer

gold

Answer

magnesium

Answer

calcium

Answer

iron

Question 15

Which metal is the most reactive?

Accepted Answer

sodium

Answer

calcium

Answer

copper

Answer

zinc

Question 16

Which metal is the least reactive?

Accepted Answer

copper

Answer

calcium

Answer

sodium

Answer

zinc

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