Chemical Reactions

Chemical Reactions

Assessment

Flashcard

Science

7th 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) undergo a transformation to form new substances (products) through the rearrangement of atoms.

2.

FLASHCARD QUESTION

Front

Can atoms be created or destroyed in a chemical reaction?

Back

No, according to the law of conservation of mass, atoms cannot be created or destroyed in a chemical reaction; they can only be rearranged.

3.

FLASHCARD QUESTION

Front

What is a chemical formula?

Back

A chemical formula is a symbolic representation of the composition of a substance, indicating the types and numbers of atoms present.

4.

FLASHCARD QUESTION

Front

What is the difference between synthetic and natural medicines at the atomic level?

Back

At the atomic level, synthetic and natural medicines can have the same molecular structure; the difference lies in their source and production methods.

5.

FLASHCARD QUESTION

Front

What are reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo change during a chemical reaction.

6.

FLASHCARD QUESTION

Front

What are products in a chemical reaction?

Back

Products are the substances that are formed as a result of a chemical reaction.

7.

FLASHCARD QUESTION

Front

What is the law of conservation of mass?

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.

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