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anyanavicka [17]
3 years ago
12

Technically speaking, in terms of chemistry and physics, steam is visible and can be seen.

Chemistry
2 answers:
Nezavi [6.7K]3 years ago
8 0
A true, hope it’s right
Anna [14]3 years ago
6 0

Answer: A.True

Explanation:

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A substance that has a uniform composition and is able to be separated by physical means
azamat
The answer is homogeneous mixture. It is a mixture which has uniform composition and properties all throughout. Mixtures can be separated by physical processes. Mixtures are systems that consist of two or more substances which are mixed but not chemically combined.
7 0
2 years ago
When hydrogen gas reacts with oxygen gas under certain conditions to produce liquid water, 572.0 kJ of heat energy is released.
frozen [14]

Answer : This reaction is an exothermic reaction.

Explanation :

Endothermic reaction : It is defined as the chemical reaction in which the energy is absorbed from the surrounding.

In the endothermic reaction, the energy of reactant are less than the energy of product.

Exothermic reaction : It is defined as the chemical reaction in which the energy is released into the surrounding.

In the exothermic reaction, the energy of reactant are more than the energy of product.

Enthalpy of reaction : It is the difference between the energy of product and the reactant. It is represented as \Delta H.

The balanced chemical reaction will be:

H_2(g)+O_2(g)\rightarrow H_2O(l)+572.0kJ

From the reaction we conclude that the heat energy is released during the reaction that means this reaction is an exothermic reaction.

Hence, the reaction is an exothermic reaction.

7 0
3 years ago
Convert 78.9 kJ into calories (can you also explain how pls, ty <3)
Elza [17]

Answer:

1 Joule=0.2390057361 Calorie

789kj=789×0.2390057361×1000

=188575.5257829calorie

Explanation:

Hope u have understand

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Your winter coat is an example of:
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B. It keeps the warm inside
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A scientist is analyzing a sample of gas that is made of fluorine (F2) and chlorine (Cl2) gas. He determines that the gas sample
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