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NARA [144]
3 years ago
5

What causes water to change state? Select the most correct answer.

Chemistry
1 answer:
Tems11 [23]3 years ago
5 0

Answer:

D. Water changes state when it loses or gains energy.

Explanation:

When water gains energy, it turns from ice to water, or water to gas. When water loses energy, it turns from gas to water, or water to ice.

Particles in the water move faster and create more energy when heated, and this causes them to spread wider apart and change. Particles slow down and move closer together when they get cold.

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How many hydrogen molecules are in 1.2 moles of hydrogen?
nalin [4]

Answer:

7.22 x 10²³molecules

Explanation:

Given parameters:

Number of moles of hydrogen  = 1.2moles

Unknown:

Number of molecules of hydrogen  = ?

Solution:

From the concept of moles, a mole of a substance contains the Avogadro's number of particles.

       1 mole of a substance  = 6.02 x 10²³ molecules;

So;  1.2 moles of hydrogen  = 1.2 x  6.02 x 10²³ molecules;

                                               = 7.22 x 10²³molecules

6 0
3 years ago
The following chemical equation is unbalanced. When the equation is balanced, what is the coefficient for pure calcium (Ca)? A.
erik [133]
<span>3Ca + 2AlPO4 -> 2Al + Ca3(PO4)2 . . .the coefficient for Ca is 3.</span>
5 0
3 years ago
Read 2 more answers
How many molecules of water are needed to completely break apart a polymer that is 11 monomers long?
tankabanditka [31]
I believe the answer is 10
6 0
3 years ago
What is the chemical formula of oven cleaner
andrey2020 [161]

Answer:

NaOH or sodium Hydroxide

Explanation:

The chief active ingredient in most over cleaners is NaOH or sodium hydroxide, also known as lye. Other common ingredients include butane (C4H10), Monoethanolamine (HOCH2CH2NH2) and Diethylene glycol monobutyl ether (C8H18O3).

5 0
4 years ago
Read 2 more answers
What fraction of the carbon dioxide exhaled by animals is generated by the reactions of the citric acid cycle
puteri [66]

Answer:

1/3

Explanation:

Pyruvate is produced by the glycolysis in cytoplasm. The oxidation of pyruvate takes place in mitochondrial matrix.  

Pyruvate is converted to acetyl-CoA in the reaction given below:

Pyruvate + NAD⁺ + CoA-SH ⇒ acetyl-CoA + NADH + CO₂

1 molecule of carbon dioxide is eliminated from 1 molecule of pyruvate.

Also,  

2 molecules of carbon dioxide is eliminated from 2 molecules of pyruvate (as glucose on glycolysis yields 2 molecules of pyruvate).

Also, acetyl-CoA further goes into the citric acid cycle and produces 2 molecules of carbon dioxide.

Thus pyruvate produces total 3 molecules of CO₂  and hence glucose produces 6 molecules of CO₂ (as glucose on glycolysis yields 2 molecules of pyruvate)

Thus,

<u>Fraction = 2/6 = 1/3</u>

4 0
4 years ago
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