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

A new substance with different properties is formed.

A chemical change because oxygen atoms from the atmosphere bonded with the iron atoms

The substance seems to disappear after dissolving in water.

Molecules split into Protons and Neutrons

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

A chemical change because oxygen atoms from the atmosphere bonded with the iron atoms and there was a color change

A physical change because the process can be reversed

The natural process of decay as metallic ions age

Which of the following statements is true?

Burning paper is an example of a chemical reaction because a new substance is formed and the process cannot be undone.

Cutting paper is an example of a chemical reaction because a new substance is formed and the process cannot be undone.

Melting ice is an example of a chemical reaction because a new substance is formed and the process cannot be undone.

Sugar dissolving in water is an example of a chemical reaction because a new substance is formed and the process cannot be undone.

Which of the following is good evidence that an unknown sample is a pure substance?

After evaporating a liquid, there is nothing left behind.

After leaving a liquid to settle, it separates.

After leaving a liquid to settle, it does not separate.

Which of the following is NOT an indicator of a chemical reaction?

Phase or state of matter change

Which of the following is true about how hydrogen and oxygen can combine to form molecules?

Hydrogen and oxygen can combine in many ways to form different molecules

Hydrogen and oxygen always form hydrogen peroxide

When oxygen combines with hydrogen to make a molecule, water will always be produced.

Molecules composed of hydrogen and oxygen must have at least four atoms

Which of the following best explains the relationship between molecules and atoms?

Molecules are made up of two or more atoms.

Atoms are molecules that have a charge.

Atoms have smaller parts, called molecules.

Molecules are atoms that have no mass.

Graphite is a soft, dark material often used as a lubricant. Diamond is often a clear, hard crystal. Which of the following best explains the difference in these materials?

The arrangement of the atoms of each one

The elements of which each one is made

The number of atoms each one is made of

The size and shape of the individual atoms

Characteristics of Chemical Reactions

Quiz

•

Chemistry, Science

•

7th Grade

•

Practice Problem

•

Medium

•

NGSS

MS-PS1-2, MS-PS1-5, MS-PS1-1

+2

Standards-aligned

Chris Zellers

Used 22+ times

FREE Resource

34 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Formed when two or more atoms chemically combine

Molecule

Atom

Reactant

Substance

Tags

NGSS.MS-PS1-1

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

Reactant

Chemical Reaction

Product

Molecule

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Smallest part of a substance

Reactant

Product

Atom

Compound

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The substances initially involved in a chemical reaction

Products

Atoms

Molecules

Reactants

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The substance that is produced from a chemical reaction

Product

Reactant

Pure Substance

Molecule

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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

Molecules

Chemicals

Reactants

Atoms

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A _____________________ increase or decrease and the production of light are both signs that a chemical reaction may have occurred.

Color

Temperature

Precipitate

Density

Tags

NGSS.MS-PS1-2

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34 questions

Formed when two or more atoms chemically combine

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

Smallest part of a substance

The substances initially involved in a chemical reaction

The substance that is produced from a chemical reaction

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

A _____________________ increase or decrease and the production of light are both signs that a chemical reaction may have occurred.

A _____________________ is a solid substance that forms and separates from a solution and may indicate that a chemical reaction has occurred.

An unexpected change in _____________________ is a sign that a chemical reaction may have occurred.

Substances giving off a smell, or ________________, while being combined is also an indicator of a chemical reaction.

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