Physical Science Semester 1 Exam Review

Human curiosity and creativity have led to improvements in technology. 

How have advances in technology affected scientists?

• They have allowed them to make more observations.

• They have allowed them to think more critically.

• They have allowed them to prove their theories true.

• They have helped them develop logical hypotheses.

Quick Review: An independent variable in an experiment is the thing we...

• Measure

• Change

• Keep the Same

• Build

A dependent variable is the thing we...

• Measure

• Change

• Keep the Same

• Observe

The things we keep the same in an experiment are called _________.

Tags

NGSS.MS-PS2-2

A student wants to determine the mass of a large plastic cube. The student measures the volume of the cube as 4 cm³. The student's teacher states that the density of the cube is 2.0 g/cm³. What is the next step the student should take to find the cube's mass?

• Calculate the mass by subtracting the volume from the density. The resulting mass will be 2.0 g.

• Calculate the mass by multiplying volume by density. The resulting mass will be 8.0 g.

• Calculate the mass by dividing volume by density. The resulting mass will be 2.0 g.

• Calculate the mass by adding volume and density. The resulting mass will be 6.0 g.

Why are all molecules not compounds?

• Molecules have two or more joined atoms, and compounds have two or more joined or loose atoms.

• Molecules are the subunits that make up compounds, so they cannot be a compound themselves.

• Compounds are a combination of elements and atoms, but molecules are only made of atoms.

• Compounds and molecules are both made up of two or more atoms, but a compound is made up of at least two different kinds of atoms.

The group that does receive the independent variable change is the

• Control Group

• Experimental Group

For the control group in an experiment, the independent variable becomes a ________.

Is this a physical or chemical change?

• Physical

• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following observations would indicate a chemical change has happened? Select ALL correct answers.

• a solid precipitate forms

• heat energy is released

• breaks into smaller pieces

• folded in half

• a gas is produced

Tags

NGSS.MS-PS1-2