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WorksheetsChemical Reactions
Total questions: 10
Worksheet time: 7mins
Name
Class
Date
1.
Which of the following is not an evidence that a chemical reaction has taken place?
a)
Production of light
b)
Change in size and shape
c)
Formation of precipitate
d)
Evolution of gas
2.
Identify the choice which does not make the correct description in this chemical equation.
2C4H10 + 13O2 --- 8CO2 + 10H2O
2C4H10 + 13O2 --- 8CO2 + 10H2O
a)
13O2, C4H10 are reactants
b)
8CO2, 10H2O are products
c)
C4H10 is a hydrocarbon
d)
2C4H10 + 13O2 --- 8CO2 + 10H2O is a precipitation reaction
3.
What is the general formula for a double replacement reaction?
a)
salt + hydrogen --- metal oxide + acid
b)
AB + CD --- AD + CB
c)
A + BC --- AC + B
d)
acid + base --- salt + water
4.
Collision theory explains how reactions occur. Which of the following statements correctly explain the factors affecting rate of reaction?
a)
Because the concentration of the reactants are higher, they are more likely to bump each other and thus react faster.
b)
A catalyst slows down the reaction by adding unnecessary substances not involved in the reaction.
c)
A smaller surface area makes the reaction between reactants more likely.
d)
As the temperature increases, the particles become less excited and have more time to stay close to each other to react.
5.
Choose the correct symbol for activation energy.
a)
AcE
b)
AE
c)
Ea
d)
Ejoule
6.
Lead (II) nitrate decomposes into lead oxide, nitrogen dioxide, and water. Choose the correct balanced chemical equation.
a)
2Pb(NO3)2 --- 2PbO + 4NO2 + O2
b)
2Pb(NO3)2 --- PbO + 4NO2 + 2O2
c)
Pb(NO3)2 --- PbO + 2NO2 + 4O2
d)
2Pb(NO3)2 --- 2PbO + 2NO2 + 3O2
7.
What law requires that both sides of a chemical equation have the same quantity of all elements?
a)
Law of equal masses
b)
Law of definite proportions
c)
Law of conservation of mass
d)
Law of constant proportions
8.
What is the meaning of (aq) in a chemical equation?
a)
Aquatic --- lives in water
b)
Aqua --- made of water
c)
Aqueous --- dissolved in water
d)
Aquatic --- associates with water molecules
9.
Reactions eventually stop. What is generally the reason for this?
Credit: DepEd G10 Manual
Credit: DepEd G10 Manual
a)
The catalyst has been used up.
b)
The particles have run out of energy.
c)
One or more of the reactants has been used up.
d)
Wrong catalyst was used.
10.
CaCO3 reacts with HCl to produce CaCl2, dihydrogen monoxide, and carbon dioxide. Which mixture displays the correct balancing of the equation with the quickest reaction?
Credit: DepEd G10 Manual, modified by me
Credit: DepEd G10 Manual, modified by me
a)
1 mole CaCO3 of marble chips + 2 HCl --- CaCl2 + H2O + CO2 at 20 degrees Celsius
b)
2 moles CaCO3 of marble chips + HCl --- 2CaCl2 + H2O + CO2 at 40 degrees Celsius
c)
1 mole CaCO3 of marble chips + 2 HCl --- CaCl2 + H2O + CO2 at 30 degrees Celsius
d)
1 mole powdered CaCO3 + 2 HCl --- CaCl2 + H2O + CO2 at 30 degrees Celsius
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