Chemical Reactions

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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