Understanding Elements and Fire

What was the primary role of fire in early human development?

• To create art

• To build shelters

• To communicate with other tribes

• To ward off predators and cook food

Why is oxygen not causing things to burst into flames constantly?

• It is not reactive

• It requires energy to start a reaction

• It is not present in the air

• It is too cold

What makes chlorine trifluoride so dangerous?

• It is used in medicine

• It is non-reactive

• It can ignite almost anything it touches

• It is a stable compound

What was the main reason the Nazis abandoned the use of chlorine trifluoride?

• It was too expensive

• It set fire to the flamethrowers and carriers

• It was not effective

• It was banned by international law

What did Henning Braunt discover by boiling urine?

• Gold

• Phosphorus

• Copper

• Iron

What was the phlogiston theory's explanation for fire?

• Fire was a result of oxygen

• Fire was a result of phlogiston leaving a substance

• Fire was a result of water

• Fire was a result of nitrogen

What did Henry Cavendish discover about the gas released from acid and iron reactions?

• It was a liquid

• It was a solid

• It was explosive

• It was non-reactive

What did Joseph Priestley discover about the gas released from mercury calcs?

• It was toxic

• It supported combustion better than normal air

• It was inert

• It was heavier than air

What was Antoine Lavoisier's contribution to the understanding of fire?

• He found fire was a type of water

• He proved fire was a removal of phlogiston

• He showed fire was a reaction with oxygen

• He discovered fire was a compound

What did Lavoisier name the gas that combined with oxygen to form water?

• Oxygen

• Hydrogen

• Carbon

• Nitrogen