gr10 L7

Multiple Choice

Why is it important for chemists to group chemical reactions into predictable patterns rather than memorizing each individual reaction?

• It saves time and helps understand new reactions

• It makes chemistry less interesting

• It is required by law

• It helps memorize all reactions easily

Multiple Choice

Which type of chemical reaction involves two smaller reactants combining to form one larger, more complex product?

• Synthesis

• Decomposition

• Single Displacement

• Combustion

Multiple Choice

Which of the following statements about single displacement reactions is correct?

• Metals can displace non-metals in a compound.

• Non-metals can displace metals in a compound.

• Metals displace metals, and non-metals displace non-metals.

• Metals and non-metals can swap partners freely.

Multiple Choice

What are the main products of hydrocarbon combustion?

• Carbon dioxide and water

• Oxygen and hydrogen

• Methane and energy

• Nitrogen and ammonia

Multiple Choice

Which reaction outputs are produced during incomplete combustion, and what makes one of them particularly dangerous?

• CO2 and H2O only, both are harmless

• CO2, H2O, and C, none are toxic

• CO2, H2O, C (soot), and CO (carbon monoxide); CO is highly toxic

• CO2 and H2O, CO is not produced

Multiple Choice

Which of the following are signs of a single displacement reaction?

• Multiple starting materials fusing into a single product

• A lone element attacking an existing compound

• Two compounds trading places

• A hydrocarbon fuel reacting with oxygen

Multiple Choice

Which of the following best describes the Law of Conservation of Mass in chemical reactions?

• Atoms are created during reactions.

• Atoms are destroyed during reactions.

• Atoms rearrange but are neither created nor destroyed.

• Atoms disappear after reactions.