Chemical Reactions

The smallest particle of an element; made of electrons, protons, and neutrons

• Atoms

• Elements

• Molecules

• Products

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The process by which one or more substances change to produce one or more different substances

• Chemical Process

• Reactant

• Chemical Reaction

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The simplest unit of a chemical compound that can exist; formed when two or more atoms join together chemically

• Atom

• Compound

• Molecule

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A solid that is deposited from a solution

• Solid

• Liquid

• Product

• Precipitate

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A substance produced during a chemical reaction

• Product

• Reactant

• Properties

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Physical and chemical characteristics of matter used to describe or identify a substance

• Chemical Reaction

• Properties

• Product

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Harrison is making cake. He prepares some batter and places it into the oven. Harrison realizes a gas, carbon dioxide, is coming out of the batter as it bakes.

Which options are true about carbon dioxide?

• It is a new gas that forms during baking.

• It is made of atoms that did not exist before.

• It is the dough changing states from solid to gas.

• It is formed from the atoms of the batter

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The element sodium (Na) is a soft solid that will react explosively with water. The element chlorine (Cl) is a toxic gas. When these two elements combine, they produce a stable, crystalline solid known commonly as table salt (NaCl).

How would you explain this?

• When substances combine to form new substances, the properties of the reactants are preserved.

• The properties of each of the two original elements are combined to give salt its properties.

• Sodium and chlorine become different elements during the reaction.

• When substances combine to form new substances, the properties of the resulting substances will be different.

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Complete the sentence.

During a chemical reaction, atoms ________.

• can appear

• can disappear

• get rearranged

• stop moving and vibrating

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NGSS.MS-PS1-5

What always happens in a chemical reaction?

• Some atoms of existing substances disappear.

• Some substances change phase.

• New atoms appear and form new substances.

• New substances form from atoms of existing substances.

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