Chemical Reactions and Equations

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

• (a) (i) and (iv)

• (b) (ii) only

• (c) (i) and (ii)

• (d) (iii) and (iv)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• (c) 4:1

• (d) 1:2

Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to

• (i) only

• (i) and (iii)

• (ii) and (iii)

• (iv) only

Tags

NGSS.MS-PS1-2

Two or more reactants combine to form one product

• Synthesis

• Single Replacement

• Double Replacement

• Combustion

A fuel is combined with oxygen to produce carbon dioxide and water

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

Tags

NGSS.MS-PS1-5

The same number of atoms of each element must be found in both reactants and products of a chemical equation to be balanced. What does this refer to?

• The law of conservation of energy

• The law of conservation of mass

• Activation energy

• Endothermic reactions

Tags

NGSS.MS-PS1-5

What coefficient is needed to balance the following equation? 2MG + O₂ --> ___ MgO

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

What coefficient is needed to balance the following chemical equation? N₂ + ___ H₂ --> 2 NH₃

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

Which of the following affect the rate of a chemical reaction?

• Temperature

• Concentration

• Catalysts

• All choices

Tags

NGSS.HS-PS1-5

What coefficient is needed to balance the following chemical equation? 2Al + 3CuCl₂ --> ___ AlCl₃ + 3Cu

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5