Flame

What is the primary source of energy in a flame?

• Oxygen

• Heat

• Light

• Fuel

Which part of the flame is usually the hottest?

• Base of the flame

• Middle of the flame

• Outer edge of the flame

• Tip of the flame

What color is typically associated with the hottest part of a candle flame?

• Red

• Blue

• Yellow

• Orange

Which of the following is necessary for a flame to exist?
a. Water
b. Carbon dioxide
c. Heat
d. Metal

• Water

• Carbon dioxide

• Heat

• Metal

What happens to a flame when it's deprived of oxygen?

• It burns brighter

• It changes color

• It extinguishes

• It splits into multiple flames

What type of reaction occurs in a flame?

• Physical

• Chemical

• Nuclear

• Electrical

Which gas is a product of combustion in a flame?

• Hydrogen

• Nitrogen

• Carbon dioxide

• Helium

Why does a flame appear to flicker?

• Changes in fuel supply

• Changes in oxygen supply

• Changes in temperature

• Changes in light intensity

What is a common use for a controlled flame?

• Heating homes

• Cooling engines

• Generating electricity

• Freezing water

Which part of a candle flame is the hottest?

• The blue part at the bottom

• The yellow part in the middle

• The red part at the top

• The outer edge