Physical / Chemical Change // Chemical Reactions

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves breaking and forming bonds between atoms. Examples include rusting, burning, and digestion.

Front

Is dissolving gatorade powder in water a physical or chemical change?

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Physical change.

Front

What is the chemical formula for calcium carbonate?

Back

CaCO3.

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How many elements are in the compound CaCO3?

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3.

Front

What does the subscript in a chemical formula indicate?

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The subscript indicates the number of atoms of the element in the molecule.

Front

What is the subscript in H2SO4 for hydrogen?

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2.

Front

How many atoms of oxygen are in KMnO4?

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4.

Front

What is a coefficient in a chemical equation?

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A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are involved in the reaction.

Front

What is the difference between a reactant and a product in a chemical reaction?

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Reactants are substances that start a chemical reaction, while products are substances formed as a result of the reaction.