7th Grade Final
Flashcard
•
Biology
•
7th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a coefficient in a chemical formula?
Back
A coefficient is a number placed in front of a chemical formula to indicate how many molecules or atoms of that substance are present. For example, in 3H2O, the coefficient 3 indicates there are three molecules of water.
2.
FLASHCARD QUESTION
Front
What is a physical change?
Back
A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. An example is dissolving salt in water.
3.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change occurs when a substance transforms into a different substance with different properties, resulting in the formation of new substances. For example, burning wood.
4.
FLASHCARD QUESTION
Front
What are reactants in a chemical equation?
Back
Reactants are the starting substances in a chemical reaction, found on the left side of a chemical equation.
5.
FLASHCARD QUESTION
Front
What are products in a chemical equation?
Back
Products are the substances formed as a result of a chemical reaction, found on the right side of a chemical equation.
6.
FLASHCARD QUESTION
Front
What is the difference between a physical change and a chemical change?
Back
In a physical change, no new substances are formed, while in a chemical change, new substances are created.
7.
FLASHCARD QUESTION
Front
What happens to particles in a solid compared to those in a gas?
Back
Particles in a solid move more slowly than particles in a gas.
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