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Helga [31]
3 years ago
14

5. After a day of testing race cars, you decide to

Chemistry
1 answer:
kvasek [131]3 years ago
8 0
Noice but I don’t get why was this necessary
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PLEASE HELP ASAP! AND PLEASE DO NOT GIVE ME ANY VIRUSES!
sertanlavr [38]

Answer:

The first one and the last one.

Explanation:

Carbon dioxide is generated by cellular respiration and released into the atmosphere.

Photosynthesis makes oxygen that plants can release into the atmosphere.

8 0
2 years ago
To describe the length of a classroom, a student should use
Kamila [148]
The answer is D).....
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3 years ago
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Name two elements, compounds and mixtures that are essential for living organisms. Also write why are they essential?​
svlad2 [7]

elements:

calcium : for strong bones

Iron : maintaining haemoglobin for metabolism

compunds

sodium chloride : to maintain blood pressure and other life processes

Adenosine Triphosphate: for metabolism, to maintain rate of inhalation and exhalation of oxygen and to supply energy

Mixture:

I) gasoline : used as fuel

ii) cement : used in construction

5 0
3 years ago
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The temperature of evaporation is much higher for water than for alcohol. Without knowing more about the chemistry of alcohol, w
Valentin [98]

Answer:

Fewer hydrogen bonds form between alcohol molecules. As a result, less heat is needed for alcohol molecules to break away from solution and enter the air.

Explanation:

Hydrogen bonding is a kind of intermolecular interaction that occurs when hydrogen is bonded to a highly electronegative atom.

Both water and alcohols exhibit hydrogen bonding. However, alcohols exhibit fewer hydrogen bonds than water.

As a result of this, the temperature of evaporation is much higher for water than for alcohol because hydrogen bonds hold water molecules more closely than alcohol molecules are held.

8 0
3 years ago
Why are coal, oil, and natural gas called fossil fuels?
sergeinik [125]

Because that's where they come from.  Coal, oil, and natural gas are the products
of dead dinosaurs rotting in the ground under great pressure for millions of years. 


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3 years ago
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