Why do candles burn?

The video explores the science behind candles, focusing on the composition and burning process of paraffin wax. It demonstrates how candles can be relit using smoke and explains the mass loss during combustion, emphasizing the law of conservation of mass. The video also covers energy release in redox reactions and discusses the unique shape of a candle flame, including how it behaves in microgravity.

What is the primary component of a candle that allows it to burn?

• The smoke

• The flame

• The wax

• The wick

What state does paraffin need to be in to sustain a candle flame?

• Gas

• Solid

• Plasma

• Liquid

How can a candle be relit after being blown out?

• By using a new match

• By lighting the wick directly

• By igniting the wax

• By relighting the smoke

What happens to the mass of a candle as it burns?

• It fluctuates

• It remains the same

• It decreases

• It increases

Into what substances is the mass of a burning candle converted?

• Oxygen and hydrogen

• Carbon dioxide and water

• Methane and ethane

• Carbon monoxide and nitrogen

Why does a candle flame have a pointed shape?

• Due to the color of the flame

• Because heated gas rises

• Because of the wax's melting point

• Due to the wick's shape

What shape would a candle flame take in a microgravity environment?

• Irregular

• Pointed

• Flat

• Spherical