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Lina20 [59]
4 years ago
7

Is the temperature at which a substance melts the same as the temperature changes from a liquid to a solid

Chemistry
1 answer:
sasho [114]4 years ago
8 0

Answer:

No.

Explanation:

If the temperature changes a substance from it's original form, going from solid to liquid, then the temperature required to change it from a liquid to a solid are the opposite. For example, Ice is Water (H2O) in it's solid form. In order to freeze water into ice, the temperature must be very low. In order to melt the ice back into water, the temperature must be higher than the freezing point, but not too high or it will boil, making it a gaseous substance instead.

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What is a substance that decreases the rate of a chemical reaction called? (5 points)
Y_Kistochka [10]

Answer:

inhibitor :)

Explanation:

Catalysts speed the reaction up, and the other 2 are essential for the reaction to work, so an inhibitor :)

6 0
3 years ago
What molecule contains 12.17 g of carbon, 32.53 g of sulfur, and 72.19 g of chlorine
Nina [5.8K]

The molecule is thiophosgene or CSCl₂.

<h3><u>Explanation:</u></h3>

As the informations given, the molecule contains 12.17 grams of carbon, 32.53 g of sulfur, and 72.19 g of chlorine.

Molar mass of carbon =12.

Molar mass of sulphur =32.

Molar mass of chlorine =35.

So on an average estimation, one mole of the molecule contains one mole of carbon atoms, one mole of Sulphur atoms and two moles of chlorine atoms. Molar mass of an element is the average weight of one mole of atoms of that element which is made average according to the variations of percentage availability of isotopes of that element on earth.

So the estimated molecule is CSCl₂ or thiophosgene.

8 0
3 years ago
A solution of hydrochloric acid is mixed with an equal volume solution of barium hydroxide. When pH paper is inserted into the r
Dennis_Churaev [7]
The balanced equation for the reaction between Ba(OH)₂ and HCl is ;
Ba(OH)₂ + 2HCl ----> BaCl₂ + 2H₂O
When equal volumes of both acid and base are added, the pH is 7 which means its neutral. 
This means that the H⁺ ions and OH⁻ are equal and they have neutralised each other. All the ions have reacted to form water molecules.
Dissociation of base and acid are as follows;
Ba(OH)₂ ---> Ba²⁺ + 2OH⁻
1 mol of Ba(OH)₂ dissociates to 2 mol H⁺
HCl ---> H⁺ + Cl⁻
n moles of HCl give out n mol of H⁺ ions
H⁺ = OH⁻ which is why solution is neutral
then OH⁻ moles present are n  mol 
then Ba(OH)₂ moles present should be n/2 mol
molarity of HCl = 0.5 mol/L
since volumes are equal number of moles are directly proportional to molarity 
molarity of Ba(OH)₂ = 0.5/2 = 0.25 M
4 0
3 years ago
Reactions cannot occur without a certain minimum amount of energy. What is this minimum amount of energy called?
Liono4ka [1.6K]
Hello!!
It should be
“the activation energy”
3 0
2 years ago
Which of the following is a reasonable ground-state electron configuration?
sergeinik [125]
<span>1s^22s^22p^63s^1 i think</span>
6 0
3 years ago
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