Table of Contents
- 1 How does the volume of a jar affect the burning time of a candle?
- 2 How does the amount of oxygen affect the time it takes the burning candle to go out?
- 3 Why do you think the flame died when the candle was covered with the jar?
- 4 What is the relationship between the size of the beaker and the burning time?
- 5 What happens when a candle is lit?
- 6 What causes candles to burn faster?
- 7 How does the burning of a candle affect the water level?
- 8 What happens when you put a candle in a pitcher?
How does the volume of a jar affect the burning time of a candle?
A candle will burn longer in a larger bottle because it contains more oxygen.
How does the amount of oxygen affect the time it takes the burning candle to go out?
Because twice as much oxygen is burned than carbon dioxide released, the air volume decreases. When the oxygen is depleted, the candle goes out and the air cools. The volume of the air decreases and the water rises. The temporary temperature change delays the rise of the water.
What happens when you put a jar over a candle?
Putting the jar over the candle keeps oxygen from outside the jar from getting in. So, when that oxygen is used up, the reaction can’t keep going. Running out of oxygen makes the flame go out.
What affects the burning rate of candles?
Smaller candles with smaller wicks will burn at a rate of 7 to 9 hours per 28 g of wax used. Larger candles with larger wicks consume wax at a faster rate. The larger wicks can be expected to yield 5 to 7 hours per 28 g of wax used.
Why do you think the flame died when the candle was covered with the jar?
Why does a candle stop burning when covered with a glass tumbler? Candle burning requires oxygen and that is present in the air naturally. When we close the candle with jar, then oxygen flow is limited and once all the oxygen present is exhausted the candle gets extinguished.
What is the relationship between the size of the beaker and the burning time?
The candles will burn for the same time because the beakers are the same size. The shortest candle will run out of wax quickest. The shortest candle will generate the most convection because the flame is at the bottom of the beaker. It will therefore burn the longest.
How did lack or presence of oxygen affect the burning of candle?
Because twice as much oxygen is burned than carbon dioxide released, the air volume decreases. When the oxygen is depleted, the candle goes out and the air cools. The volume of the air decreases and the water rises.
What changes took place in the candle?
When a candle burns, both physical and chemical changes occur.
- Physical Changes: On heating, candle wax gets melted.
- Chemical Changes : The wax near flame burns and gives new substances like carbon dioxide, carbon soot, water vapour, heat and light.
What happens when a candle is lit?
When you light a candle, the heat of the flame melts the wax near the wick. This liquid wax is then drawn up the wick by capillary action. The heat of the flame vaporizes the liquid wax (turns it into a hot gas), and starts to break down the hydrocarbons into molecules of hydrogen and carbon.
What causes candles to burn faster?
Wax is the most important ingredient that makes a candle burn faster. Soft wax has a higher oil content and lower melt temperature; therefore, it burns faster. Typically, candles in jars have soft wax, and pillar candles have hard wax.
Does the size of a candle affect how fast it burns?
Wider or thicker wicks will burn much faster than thin ones, and the material the wick is made with can also make an impact. That said, it’s important to choose the right wick for your candle project. Large candles with very thin wicks will burn unevenly and you risk the flame being drowned out by pooling wax.
Is Earth the only planet where fire can burn?
Earth is the only known planet where fire can burn. Everywhere else: Not enough oxygen. Oxygen supply influences the color of the flame. A low-oxygen fire contains lots of uncombusted fuel particles and will give off a yellow glow.
The candle’s flame is fueled by oxygen. When the jar is placed over the top of the candle, there is still oxygen for the fire to consume, but it is in a limited quantity. Once all of the oxygen contained within the jar is utilized by the flame, it no longer has its fuel and goes out.
How does the burning of a candle affect the water level?
Because twice as much oxygen is burned than carbon dioxide released, the air volume decreases. The physical aspect: the candle heats the air and expands it. This cancels the depletion of the oxygen temporarily and the water level stays down. When the oxygen is depleted, the candle goes out and the air cools.
What happens when you put a candle in a pitcher?
Experiment: Cover a burning candle with a pitcher so that the candle is in an air-tight room sealed by the water at the ground. Observations: After some time, the candle dims and goes out. Just before the candle dies, the water level rises to almost 1/10 th of pitcher height.
What happens at the end of the candle experiment?
In the candle experiment, the pressure and temperatures at the beginning and the end are essentially the same. But since the number N of oxygen molecule is replaced by N/2 carbon dioxide molecules, the corresponding volume gets divided by half too.