OSE 7.1 - Lessons 6 - 10

What process produces gas by adding energy from a battery to water?

• A) Electrolysis
• B) Condensation
• C) Evaporation
• D) Filtration

Which gases are produced from the electrolysis of water?

• A) Carbon dioxide and oxygen
• B) Nitrogen and hydrogen
• C) Oxygen and carbon monoxide
• D) Hydrogen and oxygen

What happens to the molecular structure of water during electrolysis?

• A) Water molecules combine to form larger molecules
• B) Water molecules change their shape but remain intact
• C) Water molecules are split into hydrogen and oxygen atoms
• D) Water molecules remain unchanged

When heating water, what is the primary gas produced?

• A) Hydrogen
• B) Oxygen
• C) Water vapor
• D) Nitrogen

Is the gas produced by heating water flammable?

• A) Yes
• B) No
• C) Only in high concentrations
• D) Only when mixed with other gasses

Which property of a gas can best help determine the gas' identity?

• A) Color
• B) Density
• C) Flammability

Which gas produced by electrolysis was flammable?

• A) Hydrogen
• B) Oxygen
• C) Both hydrogen and oxygen
• D) Neither hydrogen nor oxygen

What evidence suggests a chemical reaction occurs when potassium iodide reacts with hydrogen peroxide?

• A) A color change is observed.
• B) The solution becomes more viscous.
• C) A gas is released.
• D) The solution becomes less dense.

What does the conservation of mass in a chemical reaction tell us about the products and reactants?

• A) They have identical chemical properties.
• B) They occupy the same volume.
• C) They have the same total mass.
• D) They are at the same temperature.

Sodium + Chlorine -- > Sodium Chloride Which is the reactant?

• A) Sodium
• B) Chlorine
• C) Sodium + Chlorine
• D) Sodium Chloride