Physical vs. Chemical Changes

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. Examples include changes in shape, size, or state of matter.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the breaking and forming of bonds. Examples include rusting iron and burning wood.

Front

What is evidence of a physical change?

Back

Evidence of a physical change includes changes in shape, size, or state of matter, but does not include the formation of new substances.

Front

What is evidence of a chemical change?

Back

Evidence of a chemical change includes color change, gas production, temperature change, and the formation of a precipitate.

Front

Is bending copper wire a physical or chemical change?

Back

Bending copper wire is a physical change because it alters the shape of the wire without changing its chemical composition.

Front

Are hard boiled eggs a physical or chemical change?

Back

Hard boiled eggs undergo a chemical change because the proteins in the egg change structure when heated.

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What are reactants in a chemical reaction?

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Reactants are the starting substances in a chemical reaction that undergo change to form products.

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What are products in a chemical reaction?

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

Front

What does a chemical equation represent?

Back

A chemical equation represents a chemical reaction, showing the reactants on the left and the products on the right.

Front

How many atoms of aluminum are in the equation: 4Al + 3O2 --> 2Al2O3?

Back

There are 4 atoms of aluminum on the left side of the equation.