Answer:
A. Chemical
- AA battery contains chemical energy
The sample A, prepared with water instead with vinegar, is called control sample.
It is important to prepare a control sample for comparison purposes.
Using a contral sample the scientist try to discard effects that could drive to erronous conclusions.
The scientific will compare the observations on what happens to the samples with vinegar with the observations on the sample with water. If the sample with water is treated in the same way that the samples with vinegar, and the results are different, the scientific may conclude the effect of the vinegar, but is the sample with water shows a similar behavior to that of the samples with vinegar, the scientific will know that it is not the vinegar but another variable the responsible of the effect.
You would expect to find more water because the acid would parially dissolve
Answer:
The three main factors are :-
1. Heat
2. Pressure
3. Time
Explanation:
Coal oil gases are the fossil fuels these are formed from the dead organisms inside the earth. fossil fuels are non renewable. Coals are formed due to dead plants. When the plants and other material is goes inside the earth then at high temperature & pressure these plants are turned into fossil fuel. Thus high temperature & pressure are the main cause of dead organisms turned into fossil fuels.
Thus the three main factors are :-
1. Heat
2. Pressure
3. Time
<u>1. Heat</u> :- Heat is the main factor that causes to turn the remains of dead organisms into fossil fuels. Because due to heat at longer time the dead organisms turned into fossil fuel.
<u>2. Pressure:-</u> inside the earth surface pressure is high. so due to high pressure the dead organisms turned into fossil fuel.
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<u>3. Time:-</u> Time is other important factor that cause this type of change. to convert dead organisms in to fossil fuel we have to take these organisms at high pressure & temperature for a longer time. then these organisms convert in to fossil fuels.
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electrons are the particles that are negative.
