1.4a Observing Combustion Reactions

Candles stop burning when you place a glass jar over them because:

• the candles ran out of wax.

• the glass jars were too small.

• there was no more oxygen inside the jars.

• the students blew them out.

If you placed 3 different sized jars over 3 candles, which candle would burn the longest?

• The candle with the smallest jar

• The candle with the largest jar

• The smallest candle

• The candle with the longest wick

Tags

NGSS.MS-PS3-3

What visual evidence shows that combustion reactions release energy?

• The production of light and heat

• The formation of water

• The release of carbon dioxide

• The consumption of oxygen

Tags

NGSS.MS-PS3-5

Which two kinds of energy are associated with flames?

• Thermal and Chemical

• Kinetic and Potential

• Electrical and Magnetic

• Nuclear and Gravitational

Tags

NGSS.MS-PS3-3

Twigs ignite better than logs because:

• they have more atoms per unit volume.

• they have a larger surface area to volume ratio.

• they contain more moisture.

• they are denser.

What can you explain me about combustion reactions?

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-PS3-4

Why does a candle flame flicker in the wind?

• Because the wind disrupts the combustion process.

• Because the wick absorbs more wax.

• Because the wind increases oxygen supply.

• Because the wax melts unevenly.

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NGSS.MS-PS2-2

NGSS.MS-PS2-5

What happens to the wax in a candle as it burns?

• It remains solid and unchanged.

• It evaporates into the air.

• It melts and drips away.

• It is converted into gas and burned.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-PS1-4

Which factor does NOT affect the rate of combustion in a fire?

• Temperature of the environment

• Surface area of the fuel

• Amount of oxygen available

• Color of the fuel