G8 T3 EOT EXAM PRACTICE QUESTIONS

The equation below shows the masses of the chemicals in the reaction between zinc and hydrochloric acid. What is the mass of hydrogen that is produced? 

• 2 g

• 7 g

• 70 g

• 272

What is the difference between an exothermic reaction and an endothermic reaction?

• Exothermic reactions release energy, endothermic reactions absorb energy

• Exothermic reactions absorb energy, endothermic reactions release energy

• Exothermic reactions release thermal energy, endothermic reactions absorb thermal energy

• Exothermic reactions absorb thermal energy, endothermic reactions release thermal energy

Which of these is a chemical property of a substance? 

• Size

• Shape

• Melting point

• Flammability

What is solubility? 

• • The minimum amount of solute than can be dissolved in a given amount of solvent at a given temperature 

• • The maximum amount of solute that can be dissolved in a given amount of solvent at a given temperature 

• • The minimum amount of solvent than can be dissolved in a given amount of solute at a given temperature 

• • The maximum amount of solvent that can be dissolved in a given amount of solute at a given temperature 

When sodium reacts with chlorine to form sodium chloride, what is the product? 

• Sodium

• Chlorine

• Sodium and chlorine

• Sodium chloride

Characterize the reaction type of the reaction below 

CaO + H₂O ----> Ca(OH)₂

• Synthesis

• Decomposition

• Combustion

• • Single displacement

Consider the following reaction: 

Ba(NO₃)_2(aq) + K₂SO_4(aq) → BaSO_4(s) + 2KNO_3(aq) 

Which substance is the precipitate? 

• Ba(NO₃)₂

• • K₂SO₄

• BaSO₄

• KNO₃

The following equation is an example of an oxidation-reduction reaction: 

 

PbO_(s) + H₂ ----> Pb_(s) + H₂O  

  

Reduction has occured to Pb in this reaction. What does this mean? 

• • Pb has changed state 

• • Pb has lost energy 

• • Pb has lost electrons 

• • Pb has gained electrons 

Describe how hydrogen ions are associated with both acids and bases 

• • Acids produce H⁺ ions, bases accept H⁺ ions 

• • Bases produce H⁺ ions ions, acids accept H⁺ ions 

• • Acids produce OH⁺ ions, bases accept OH^- ions 

• • Bases produce OH⁺ ions, acids accept OH^- ions 

Why is a log fire considered exothermic?

• • Because it is releasing energy in the form of light 

• • Because it is absorbing energy in the form of light 

• • Because it is releasing energy in the form of heat 

• • Because it is absorbing energy in the form of heat