Understanding Chemical Reactions and Conservation

Understanding Chemical Reactions and Conservation

Assessment

Flashcard

Science

8th Grade

Hard

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15 questions

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1.

FLASHCARD QUESTION

Front

What is a chemical reaction?

Back

A chemical reaction is a process in which substances (reactants) are transformed into different substances (products) through the breaking and forming of chemical bonds.

2.

FLASHCARD QUESTION

Front

What does the law of conservation of mass state?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

3.

FLASHCARD QUESTION

Front

What are coefficients in a chemical equation?

Back

Coefficients are the numbers placed before the compounds in a chemical equation that indicate the number of molecules or moles of each substance involved in the reaction.

4.

FLASHCARD QUESTION

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure that the number of atoms of each element is the same on both sides of the equation.

5.

FLASHCARD QUESTION

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations is important because it reflects the conservation of mass and ensures that the reaction obeys the law of conservation of matter.

6.

FLASHCARD QUESTION

Front

What happens to the mass of reactants during a chemical reaction?

Back

The mass of the reactants remains constant and is equal to the mass of the products after the reaction.

7.

FLASHCARD QUESTION

Front

What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a reaction, starting the process.

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