Unit 3 AOS 1 Chemistry - Key Knowledge questions

Which of the following best describes the difference between fossil fuels and biofuels?

• Fossil fuels are liquid, biofuels are solid

• Fossil fuels are renewable, biofuels are non-renewable

• Fossil fuels are non-renewable, biofuels are renewable

• Fossil fuels are synthetic, biofuels are natural

What is the primary source of glucose and oxygen for respiration in living things?

• Cellular respiration

• Fermentation

• Photosynthesis

• Combustion

Which of the following is NOT a fuel source for the human body?

• Carbohydrates

• Proteins

• Lipids

• Cellulose

In the balanced equation for cellular respiration, how many moles of oxygen are required to completely oxidize one mole of glucose?

• 1 mole

• 3 moles

• 6 moles

• 12 moles

What is the main product of glucose fermentation in the production of bioethanol?

• Methanol

• Ethanol

• Propanol

• Butanol

Which of the following best describes an endothermic reaction?

• Heat is released to the surroundings

• Heat is absorbed from the surroundings

• No heat transfer occurs

• The reaction produces light energy

In an exothermic reaction, what is the relationship between bond breaking and bond forming?

• Energy released by bond forming > energy required for bond breaking

• Energy released by bond forming < energy required for bond breaking

• Energy released by bond forming = energy required for bond breaking

• There is no relationship between bond breaking and forming

What determines whether a reactant is limiting in a chemical reaction?

• Its molecular mass

• Its concentration

• Its relative quantity compared to other reactants

• Its physical state

Which of the following is a product of the incomplete combustion of hydrocarbons?

• Carbon dioxide

• Hydrogen

• Carbon monoxide

• Oxygen

How is the specific heat capacity of water used in calorimetry experiments?

• To determine the mass of fuel burned

• To calculate the energy released during combustion

• To measure the volume of water used

• To control the reaction temperature