what happens when a candle is alight, basing it on energy.
what are the physical changes and chemical changes?
please heip me asap
thanx
One physical change is that the candle melts. One chemical change is that some of the candle (wax--which is a hydrocarbon) combines with oxygen to produce CO2 and H2O. This is an exothermic reaction and produces heat and light in addition to the other products. Read in your text or notes to help understand what is going on.
thanx is there anymore chemical changes
i have 2 do a poster explaining what happens when a candle is alight
thanx 4 your help is there anythjing else you know
xx
do you no anything else
plz help
xx
When a candle is alight, it undergoes both physical and chemical changes. Let's break it down:
1. Physical Changes:
- Melting: The heat of the flame causes the wax near the wick to melt, converting it from a solid to a liquid.
- Evaporation: As the liquid wax absorbs heat from the flame, it starts to evaporate, turning into a gas.
- Combustion: The gas from the melted wax mixes with oxygen in the air and burns, producing heat, light, and a flame.
2. Chemical Changes:
- Combustion: During the combustion process, the hydrocarbons in the wax combine with oxygen to produce carbon dioxide gas (CO2) and water vapor (H2O). This chemical reaction releases energy in the form of heat and light.
To explain how energy is involved in your question, we need to understand that energy is neither created nor destroyed, but it can change from one form to another. In the case of a candle, the energy from the burning wax is transformed into heat and light energy.
To observe these changes, you can conduct a simple experiment:
1. Light a candle and observe the physical changes, such as the melting wax, the evaporating liquid wax, and the formation of the flame.
2. You can also use a thermometer to measure the increase in temperature, which indicates the release of heat energy.
3. You can see the emission of light energy by noticing the glow of the flame in a dark room.
Remember to exercise caution and keep a fire extinguisher nearby when working with open flames.