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3 years ago

How to identify a chemical reaction

Chemistry

2 answers:

Kamila [148]3 years ago

6 0

Explanation:

We can tell if a chemical reaction has taken place when one or more of the following things happen:

1.There has been a colour change inside the reaction flask.

2. A gas has formed. Usually we know a gas has formed when we can see bubbles.

3.A solid has formed.

hope this answer helps!!!

sladkih [1.3K]3 years ago

3 0

Explanation:

A Chemical Reaction Is Usally Accompaneid by easly observed physical effects such as the emissions of heat and light the information of a precipitate the evaluation of gas,or a color change

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The first jar has a liquid and room temperature. It is colorless. It has a density of of approximately.8. What is it? O Water O

Paha777 [63]

Answer:

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Explanation:

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According to VSEPR theory, what is the bond angle of CCl4?

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What prevents a plant cell from bursting when it's full of water?

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3 years ago

According to Archimedes' principle, the mass of a floating object equals the mass of the fluid displaced by the object. A 150-lb

julsineya [31]

Answer:

The density of the swimmer is 0.0342 lbm/in3.

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Explanation:

If the swimmers is floating, the weight of the swimmer must be equal to the upward buoyant force.

We can express the weight force as the product of density and volume of the swimmer.

Then

$\rho_{swimmer}*V_{swimmer}=\rho_{water}*V_{water_displaced}\\\\\rho_{swimmer}*V_{swimmer}=\rho_{water}*0.95**V_{swimmer}\\\\\rho_{swimmer}=0.95*\rho_{water}\\\\\rho_{swimmer}=0.95*0.036 lbm/in3\\\\\rho_{swimmer}=0.0342lbm/in3$

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3 years ago

In a hydrogen molecule, the two hydrogen atoms are held together by a single bond with a bond energy of 436 kj/mol of hydrogen.

svetoff [14.1K]

Answer: 873 kJ of energy will be required to break two moles of hydrogen gas.

$2H_2+O_2\rightarrow 2H_2O$

Above chemical equation shows that two moles of hydrogen gas is reacting with one mole of oxygen gas to give two mole of water molecule.

Bond energy of H-H = 436kJ

According to reaction we have two moles hydrogen,so energy required to break the

H-H bond in two moles of hydrogen gas will be:

$2\times \text{bond energy of H-H bond}$

$2\times {436}$ = 872kJ

872kJ of energy will be required to break H-H bond in two moles of hydrogen gas.

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4 years ago

Read 2 more answers