Law of conservation of mass

Law of conservation of mass

Assessment

Flashcard

Science, Other

7th Grade

Hard

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed in a chemical reaction.

2.

FLASHCARD QUESTION

Front

What does the coefficient in a chemical equation represent?

Back

The number of moles of a substance involved in the reaction.

3.

FLASHCARD QUESTION

Front

Identify the reactants in the reaction: 2Mg + O2 ---> 2MgO.

Back

Mg (magnesium) and O2 (oxygen) are the reactants.

4.

FLASHCARD QUESTION

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a compound or element to indicate how many molecules or moles are involved.

5.

FLASHCARD QUESTION

Front

If a reaction starts with 20g of reactants, what should be the total mass of the products?

Back

The total mass of the products should also be 20g, according to the Law of Conservation of Mass.

6.

FLASHCARD QUESTION

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the number of atoms for each element is the same on both sides of the equation.

7.

FLASHCARD QUESTION

Front

What happens to mass during a chemical reaction?

Back

The total mass remains constant; it is conserved.

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