Free Printable Chemical Reactions and Equations

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Chemical Reactions and Equations

Total questions: 15

Worksheet time: 12mins

Name

Class

Date

When two substances were combined, bubbles were produced and the temperature dropped. This most likely means that:

a chemical reaction took place

the two substances had low boiling points

one substance dissolved in the other

the two substances are non-reactive

Which observation would most likely indicate that an exothermic reaction has occurred?

a color change

the production of gas bubbles

an increase in temperature

a decrease in temperature

The first part of a balanced chemical equation is shown: H₂SO₄ + 2NaOH → ________. In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products?

Suppose the mass of two reactants totals 10 grams. After the chemical reaction, what should be the total mass of the products?

0 grams

5 grams

10 grams

20 grams

Which among the following is(are) double displacement reaction(s)?(i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl (iii) C + O2 → CO2 (iv) CH4 + 2O2 → CO2 + 2H2O

(i) and (iv)

(ii) only

(i) and (ii)

(iii) and (iv)

Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to(i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride(iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride

(a) (i) only

(i) and (iii)

(d) (iv) only

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?(i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction

(a) (i) only

(b) (ii) only

(d) (ii) and (iv)

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

(a) 1:1

(b) 2:1

(d) 1:2

14. Which of the following gases can be used for storage of fresh sample of an oil for a long time?

(a) Carbon dioxide or oxygen

(b) Nitrogen or oxygen

(d) Helium or nitrogen

10.

The oxidizing agent in the following reaction is (a)

CuO + H₂ -->Cu + H₂O

11.

CaO + H₂O --> Ca(OH)₂

This is an example of

Combination reaction

Decomposition reaction

Displacement reaction

None of the above

12.

Assertion: AgBr is used on photographic and X – ray film.

Reason: AgBr is photosensitive and changes to Ag and bromine in presence of sunlight and undergoes decomposition reaction.

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

Assertion is true but the reason is false.

The statement of the Assertion is false but the Reason is true.

13.

In a chemical reaction, if the reactants are heated, the reaction usually happens

slower

faster

at the same rate

in a smaller volume

14.

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

H₃PO₄

H₂SO₄

HCIO₃

H₂O

15.

Some stale food gives a bad taste and bad smell because of:

Heating

Displacement

Corrosion

Rancidity

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Chemical Reactions and Equations

Total questions: 15

Worksheet time: 12mins

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