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I think change in the composition.
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∙ 8y ago
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What happens to the composition of a substance during a chemical change?
Atoms are rearranged, heat may be given off, changes in color and odor might occur, or a gas or precipice may be formed. The composition is changed, and the above are signs of a chemical change.
What happens to energy during a chemical change?
when a chemical change occurs, chemical bonds are broken up
Do chemical change and physical change always occur sepretly?
Any physical changes that change during a chemical reaction are the consequence of the products physical properties. The melting point may be much lower than the reactants and change state but ultimately it was the properties responsible for this and not the chemical reaction itself. If anything there are situations where the two both occur somewhat simultaneously as well as situations where chemical change doesn't proceed with a physical change and vice versa.
Why does a change in temperature indicate that a chemical reaction may occur?
Because a chemical reaction has different sign's. And heat is one. But if the temperature is dropping then it is not going through a chemical change.
Mass does not change during a chemical change how about for a physical change?
Physical changes are like cutting paper. The mass does not change. Chemical changes do not change total mass either. If you put a candle in a sealed container so that you may measure the total mass of the candle and the air before burning, then light the candle electrically but keep everything sealed, the total mass after burning will still be the same. But if you measure only the candle, then its mass has changed. So the mass of one single 'ingredient' will change during a chemical change.
What always results in a chemical reaction?
a new compound is formed a change in temperature occurs during reaction,
What Three Things can happen when a Chemical Reaction occur?
A chemical reaction can change a substance into a solid, liquid, or gas. It may cause a substance to explode or could cause no change at all.
Why does a chemical change in temperature indicate that a chemical reaction may have occurred?
A change of temperature implies that some energy has been transfered or used. Since chemical reactions either require or release energy to occur, the environment may change temperature as the substances react.
Why is there no chemical equation to describe what happens when water evaporates?
That's because there is no chemical change. In most cases, there is no chemical change when a substance evaporates. The exception is very long molecules, which may break apart during evaporation.
When heat is added to a situation what 3 things happen?
- the volume increase- the density decrease- a chemical reaction may occur- a change of phase is possible
What are the major errors that may occur during performance evaluation?
major errors that may occur during performance evaluation
How do you deal with the problems which may occur during your work and how to report these?
How do you deal with the problems which may occur during your work and how to report these
