Unit 1: Matter and its Interactions Review

1 Basics

2

Which variable belongs on the X axis?

Independent 

2

If one variable increases as the other variable increases, this is known as _______________ correlation.

Positive

2

If one variable increases as the other variable decreases, this is known as _______________________ correlation.

Negative

2

The variable that is purposefully, or intentionally, changed by the scientist during a controlled experiment.

Independent variable

2

The variable that the scientist measures, or thinks might be affected, during an experiment.

Dependent

2 Properties

2

A change that affects one or more physical properties of a substance - without a change in its chemical properties.

Physical Change

2

All the descriptors of a substance that can be measured or observed without changing the type of matter.

Physical Properties

2

Physical Property or Chemical Property?

Solubility

Physical Property

2

Physical Property or Chemical Property?

Reactivity

Chemical Property

2

Physical Change or Chemical Change?

Powder from a lemonade mix is stirred and dissolves in a pitcher of water.

Physical Change

3 Density

2

Is density a physical property or a chemical property?

Physical Property

2

A cylinder has a mass of 4.5 g and takes up 1.5 cm³ of space. What is the density of the cylinder?

3.0 g/cm³

2

What is the density of an object that takes up 72 mL of space and is 9g?

0.125 g/mL

2

A 1575g piece of silver takes up 150 cm3 of space. What is the density of silver?

10.5 g/cm³

2

An irregularly shaped solid object displaces 5 mL of water. It has a mass of 10 g. What is the density of the object?

2 g/cm³

4 Phase Changes

2

A measure of how fast the particles in an object are moving.

Temperature

2

A form of kinetic energy associated with molecules in motion; also known as "heat"

Thermal energy

2

The temperature at which a liquid turns into a gas.

Boiling point

2

The temperature at which a liquid becomes a solid.

Freezing Point

2

True or False: Water takes up more space as a liquid than it does as a solid.

False - water expands when it freezes and becomes ice.

Lesson 5 & Lesson 6

2

Draw the Lewis Dot Diagram for Helium

He - 2 valence electrons

2

I am in the Carbon Group, Period 5. What element am I?

Tin (Sn)

2

Is methane (CH₄) an element, compound, or a mixture?

Compound - composed of two or more different atoms that are chemically bonded

2

Is lemonade an element, compound, or mixture?

Mixture

2

True or False

Atoms always have the same number of electrons as they do protons

False - Atoms can gain or lose electrons if they are not neutral