Characteristics of Chemical Reactions

A chemical reaction occurs that involves combining 1 atom of zinc with 2 atoms hydrogen and 2 atoms of chlorine. After the reaction, how many atoms of each element will there be?

• 1 zinc, 2 hydrogen, 2 chlorine

• 2 zine, 2 hydrogen, 2 chlorine

• 2 zinc, 1 hydrogen, 2 chlorine

• 3 zinc, 2 hydrogen, 2 chlorine

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-PS1-1

Which of the following is the best description of the results of a chemical reaction?

• A new substance with different properties is formed.

• The substance seems to disappear after dissolving in water.

• The substance changes from liquid to a solid at a low temperature

• The reaction can be reversed to get back the original substance

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NGSS.MS-PS1-2

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Rust forming on a piece of iron is an example of which of the following:

• A physical change because the process can be reversed

• The natural process of decay as metallic ions age

• A chemical change between oxygen atoms from the atmosphere bonded with the iron atoms

• A violation of the laws of physics because new mass has been created

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NGSS.MS-PS1-5

During a chemical reaction, substances (called reactants) are combined to form new substances (called products). Which of the following accurately describes the reactants and the products of a chemical reaction?

• The products contain a different number of atoms than the reactants but have the same properties.

• The number of atoms and the properties are the same in the reactants and the products.

• The products contain the same number of atoms of atoms as the reactants but have different properties.

• The number of atoms and the properties are different in the reactants and the products.

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NGSS.MS-PS1-2

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Formed when two or more atoms chemically combine

• Reactants

• Chemical Reaction

• Atom

• Product

• Molecule

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NGSS.MS-PS1-1

A process that leads to the transformation of one set of chemical substances to another

• Reactants

• Chemical Reaction

• Atom

• Product

• Molecule

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Smallest particle of an element

• Reactants

• Chemical Reaction

• Atom

• Product

• Molecule

The substance initially involved in a chemical reaction

• Reactants

• Chemical Reaction

• Atom

• Product

• Molecule

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

The substance that is produced from a chemical

• Reactants

• Chemical Reaction

• Atom

• Product

• Molecule

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NGSS.MS-PS1-5

In a chemical process, atoms that make up a substance are regrouped into different _____________ to form new substances with different properties.

• Color

• Molecules

• Precipitate

• Temperature

• Gas

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NGSS.MS-PS1-5

NGSS.MS-PS1-1