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2 years ago

The law of conservation of mass

Chemistry

2 answers:

elixir [45]2 years ago

7 0

Mass cannot be created or destroyed but only converted from one form to another

Karolina [17]2 years ago

4 0

In a chemical reaction mass is neither created nor destroyed

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Which of the following pairs of elements belong to the same group

ale4655 [162]

C. C and Pb; Carbon and Lead being in the same group.

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3 years ago

A solution of CaCl 2 in water forms a mixture that is 42.0 % calcium chloride by mass. If the total mass of the mixture is 839.6

Lerok [7]

Answer : The masses of calcium chloride and water used were, 352.6 g and 487.0 g.

Explanation :

As we are given that 42.0 % calcium chloride by mass that means 42.0 grams of calcium chloride present in 100 grams of solution.

In the solution or mixture, 42.0 % calcium chloride and 58.0 % (100-42.0=58.0) water.

Now we have to determine the mass of calcium chloride for 839.6 grams of solution.

As, 100 grams of solution contains 42.0 grams of calcium chloride

So, 839.6 grams of solution contains $\frac{42.0}{100}\times 839.6=352.6$ grams of calcium chloride

Thus, the mass of calcium chloride used is, 352.6 grams.

Now we have to determine the mass of water.

Mass of water = Mass of solution - Mass of calcium chloride

Mass of water = 839.6 g - 352.6 g

Mass of water = 487.0 g

Thus, the mass of water used is, 487.0 grams.

6 0

3 years ago

Calculate the volume of water which was liberated during the decomposition of hydrogen peroxide.

nikitadnepr [17]

The answer is :

The normal equation for the decomposition of hydrogen peroxide indicates that 2 vol. peroxide vapor should give rise to 2 vol. water vapor and 1 vol. oxygen.

What is hydrogen peroxide ?

Hydrogen peroxide is water (H2O) with an extra oxygen molecule (H2O2).
The extra oxygen molecule oxidizes, which is how peroxide gets its power says Dr. Beers.
This oxidation kills germs and bleaches color from porous surfaces like fabrics.
Hydrogen peroxide is found in biological systems including the human body.
Enzymes that use or decompose hydrogen peroxide are classified as peroxidases.

To learn more about Hydrogen peroxide visit: brainly.com/question/18709693?

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1 year ago

Is a bimolecular reaction necessarily second-order? Is a second-order reaction necessarily bimolecular? Answer, with explanation

Kruka [31]

A bimolecular reaction is always a second-order reaction, but a second-order reaction is not always a bimolecular reaction.

The most important thing to take note of is that molecularity of a reaction is a concept applicable to only elementary reactions, meaning non-complex. In a way, elementary reactions are basic and achieved in one step. Complex reactions involve intermediate steps before achieving the desired reaction.

Molecularity is equal to the sum of the coefficients of the reactants, so two reactants give a second-order bimolecular reaction. However, second-order reactions can involve more than two reactants especially in complex reactions.

3 0

3 years ago

How do I solve this question to get the answer : -141

Sati [7]

Hope this would help you
need more details ?

7 0

3 years ago

The law of conservation of mass​

The law of conservation of mass