Chemistry Flashcard Review

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, often accompanied by energy changes, color changes, or the production of gas. Example: Burning wood produces ash and smoke.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What are elements made of?

Back

Elements are made of one type of atom. Each element has unique properties and cannot be broken down into simpler substances.

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NGSS.MS-PS1-1

Front

What is evidence of a chemical reaction?

Back

Evidence of a chemical reaction includes color change, gas production, temperature change, and the formation of a precipitate. Example: An iron nail turning red in the presence of oxygen.

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NGSS.MS-PS1-2

Front

How can you tell if a chemical equation is balanced?

Back

A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation. Example: @@2H_2 + O_2 ightarrow 2H_2O@@ is balanced.

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NGSS.MS-PS1-5

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements chemically bond together. Example: Water (H2O) is a compound made of hydrogen and oxygen.

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NGSS.MS-PS1-1

Front

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

Back

A physical change alters the form of a substance but not its chemical composition (e.g., ice melting). A chemical change results in the formation of new substances (e.g., rusting iron).

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NGSS.MS-PS1-2

Front

What is a molecule?

Back

A molecule is the smallest unit of a chemical compound that retains its chemical properties, consisting of two or more atoms bonded together. Example: A water molecule (H2O) consists of two hydrogen atoms and one oxygen atom.

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NGSS.MS-PS1-1

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.

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NGSS.MS-PS1-5

Front

What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a reaction. Example: In the reaction @@2H_2 + O_2 ightarrow 2H_2O@@, hydrogen and oxygen are the reactants.

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NGSS.MS-PS1-1

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction. Example: In the reaction @@2H_2 + O_2 ightarrow 2H_2O@@, water (H2O) is the product.

Tags

NGSS.MS-PS1-1