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What are the products of the combustion of coal?

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Carbon dioxide (CO2) and water (H2O) are produced when coal burns in the presence of oxygen.

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NGSS.MS-PS1-5

Front

What is a precipitate in a chemical reaction?

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A precipitate is a solid that forms when one liquid is poured into another, indicating a chemical reaction has occurred.

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NGSS.MS-PS1-2

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How can you determine if a chemical equation is balanced?

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A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation.

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NGSS.MS-PS1-5

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What is the definition of a chemical reaction?

Back

A chemical reaction is a change in matter that produces one or more new substances.

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NGSS.MS-PS1-2

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Front

What evidence indicates that a chemical reaction has occurred?

Back

The production of a new substance is the best evidence that a chemical reaction has occurred.

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NGSS.MS-PS1-2

Front

What is the role of oxygen in combustion reactions?

Back

Oxygen acts as a reactant that combines with a fuel (like coal) to produce energy, carbon dioxide, and water.

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

Back

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

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NGSS.MS-PS1-4

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.

Tags

NGSS.MS-PS1-5

Front

What are reactants in a chemical reaction?

Back

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

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NGSS.MS-PS1-2

Front

What is an example of a chemical reaction?

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An example of a chemical reaction is the rusting of iron, where iron reacts with oxygen to form iron oxide (rust).

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NGSS.MS-PS1-5