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3 years ago

Check all the statements that are correct. Conservation of mass means:

Chemistry

2 answers:

Llana [10]3 years ago

8 0

Conservation of mass means:

We must start and end with the same amount of matter

Matter cannot be created

<em>In a closed / isolated system, the total mass of the substance before the reaction will be equal to the total mass of the reaction product. </em>

<h3>Further explanation </h3>

In general, the reaction takes place in the open air. If the reaction results in the form of gas as in combustion, the mass of the reaction results will be smaller than the original mass. Or if the reaction binds to a larger than the environment then the reaction results will produce a greater mass than the original mass.

For example, in a paper combustion reaction the mass of combustion ash is smaller than the mass of paper that is burned because there is a gas released into the air

Conservation of mass applies to a closed system, where the masses before and after the reaction are the same

Let see the answer choices :

We can start a reaction with different types of elements than we have at the end of the reaction.

This statement is true, the elements in the reaction will also be found in the product, but in the form of other compounds

Matter cannot be created

Matter cannot be created nor destroyed by chemical reactions

This statement is true, because matter only changes or is rearranged

Matter can be destroyed in a chemical reaction

Incorrect statement

<h3>Learn more </h3>

Complete and balance the molecular equation

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The law of conservation of matter

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Lavoisier transforms the field of Chemistry

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Keywords : matter, Conservation of mass, chemical reaction,closed system

ValentinkaMS [17]3 years ago

3 0

Conservation of mass means: b. We must start and end with the same amounts of matter and c. Matter cannot be created and

<h3>Explanation: </h3>

The law of conservation of mass states that for any system that closed to all transfers matter and energy, the system mass must remain constant over time as the system's mass cannot change, so the quantity can neither be added nor be removed.

The law of conservation of mass means that matter cannot be created or destroyed, but it can change forms. Every chemical equation adheres to the law of conservation of mass which states that matter cannot be created or destroyed. According to the law of mass conservation, the product mass in a chemical reaction must be equal the mass of the reactants. The law of mass conservation states that in a closed system, the system mass cannot change over time.

Check all the statements that are correct. Conservation of mass means:

a. We can start a reaction with different types of elements than we have at the end of the reaction.
b. We must start and end with the same amounts of matter
c. Matter cannot be created
d. Matter can be destroyed in a chemical reaction

Learn more about conservation of mass brainly.com/question/1859083

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Chemical energy is released when molecular bonds are formed.<br> True<br> False

sveticcg [70]

The answer is false

6 0

3 years ago

Be sure to answer all parts. Express the rate of reaction in terms of the change in concentration of each of the reactants and p

Tanzania [10]

Answer : The [H] is increasing at the rate of 0.36 mol/L.s

Explanation :

The general rate of reaction is,

$aA+bB\rightarrow cC+dD$

Rate of reaction : It is defined as the change in the concentration of any one of the reactants or products per unit time.

The expression for rate of reaction will be :

$\text{Rate of disappearance of A}=-\frac{1}{a}\frac{d[A]}{dt}$

$\text{Rate of disappearance of B}=-\frac{1}{b}\frac{d[B]}{dt}$

$\text{Rate of formation of C}=+\frac{1}{c}\frac{d[C]}{dt}$

$\text{Rate of formation of D}=+\frac{1}{d}\frac{d[D]}{dt}$

$Rate=-\frac{1}{a}\frac{d[A]}{dt}=-\frac{1}{b}\frac{d[B]}{dt}=+\frac{1}{c}\frac{d[C]}{dt}=+\frac{1}{d}\frac{d[D]}{dt}$

From this we conclude that,

In the rate of reaction, A and B are the reactants and C and D are the products.

a, b, c and d are the stoichiometric coefficient of A, B, C and D respectively.

The negative sign along with the reactant terms is used simply to show that the concentration of the reactant is decreasing and positive sign along with the product terms is used simply to show that the concentration of the product is increasing.

The given rate of reaction is,

$2D(g)+3E(g)+F(g)\rightarrow 2G(g)+H(g)$