Physical Science final 3.0

Which variable is changed on purpose in an experiment?

• Dependent variable

• Controlled variable

• Independent variable

• Random variable

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

• Physical change alters composition, chemical change alters appearance

• Physical change alters appearance, not composition

• Chemical change alters appearance, not composition

• Physical change creates new substances

Why is it important to keep controlled variables constant in an experiment?

• To ensure a fair test

• To change the outcome

• To increase the number of variables

• To make the experiment more difficult

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

Which of the following best describes a homogeneous mixture?

• Unevenly mixed

• Evenly mixed (solution)

• Ionized gas, found in stars

• Definite shape and volume

What is a precipitate?

• Starting substance in a chemical reaction

• Substance formed as a result

• Solid formed from a chemical reaction in a liquid

• Combination of substances not chemically bonded

Which term describes the starting substance in a chemical reaction?

• Product

• Reactant

• Precipitate

• Law

A product in a chemical reaction is:

• The starting substance

• The solid formed in a liquid

• The substance formed as a result

• The combination of substances not chemically bonded

Tags

NGSS.MS-PS1-2

What does the term "accuracy" refer to in scientific measurements?

• How close to true value

• How consistent results are

• How fast a measurement is taken

• How many measurements are made

Which formula correctly represents density?

• Density = Mass ÷ Volume

• Density = Volume ÷ Mass

• Density = Mass × Volume

• Density = Mass + Volume

According to the Law of Conservation of Mass, what happens to matter during a chemical reaction?

• Matter cannot be created or destroyed

• Matter is always created

• Matter is always destroyed

• Matter changes into energy

Tags

NGSS.MS-PS1-5