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What is a chemical formula?

Back

A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound or molecule.

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What does a model of atoms and molecules represent in a chemical reaction?

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It shows how atoms and molecules rearrange to form new substances during a chemical reaction.

Front

What is the difference between a physical change and a chemical change?

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A physical change alters the form or appearance of a substance without changing its composition, while a chemical change results in the formation of new substances.

Front

If an oreo cookie weighs 20 grams and is crushed, what will the weight of the crumbs be?

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20 grams, because the mass is conserved in a physical change.

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What happens to molecules during a chemical reaction?

Back

Molecules rearrange to form new molecules, resulting in a change in properties.

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What is an example of a physical change?

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Smashing cookies is a physical change because it changes the shape but not the chemical composition.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

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What is a reactant in a chemical reaction?

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A reactant is a substance that undergoes change during a chemical reaction.

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What is a product in a chemical reaction?

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A product is a substance that is formed as a result of a chemical reaction.

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What is the significance of chemical equations?

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Chemical equations represent the reactants and products in a chemical reaction, showing the conservation of mass.