Pure Substances & Mixtures
States of Matter
Chemical & Physical Properties & Changes
Atomic Structure & Periodic Table
Law of Conservation of Matter
100

A substance made of only one type of atom or molecule is called a _______.

Pure substance

100

What are the three most common states of matter on Earth?

Solid, liquid, gas

100

Cutting paper is an example of what type of change?

Physical change

100

What are the three main parts of an atom?

Protons, neutrons, and electrons

100

Matter cannot be created or destroyed, only _______.

Changed or transformed

200

What type of mixture looks the same throughout?

Homogeneous mixture

200

In which state of matter do particles move the fastest?

Gas

200

Burning wood is an example of what type of change?

Chemical change

200

What part of the atom has a positive charge?

Proton

200

The total mass of the reactants equals the total mass of the _______.

Products

300

In a mixture of sand and water, which can be separated by filtering?

The sand

300

What happens to the particles of a solid when it melts?

They gain thermal energy and move faster

300

What is a sign that a chemical change has occurred?

Color change, gas production, temperature change, or new substance formed

300

What is the number of protons in an atom called?

Atomic number

300

When vinegar reacts with baking soda, gas forms and escapes. Why does the total mass seem to change?

Gas leaves the container, but total matter stays the same

400

Is salt water a compound or a mixture?

A mixture

400

What is it called when a gas changes directly into a solid?

Deposition

400

Is melting ice a physical or chemical change?

Physical change

400

Elements in the same column (group) on the periodic table have what in common?

Similar chemical properties or same number of valence electrons

400

Why do we balance chemical equations?

To show that mass is conserved

500

Explain how you can separate a mixture of salt and water.

Evaporate the water, leaving the salt behind

500

Explain how temperature affects particle motion.

Higher temperatures make particles move faster; lower temperatures make them move slower

500

Explain the difference between a physical property and a chemical property.

Physical properties can be observed without changing the substance; chemical properties describe how a substance reacts to form new substances

500

Describe the location and charge of protons, neutrons, and electrons.

Protons (+) and neutrons (0) are in the nucleus; electrons (–) orbit the nucleus

500

In a reaction, 12 g of carbon reacts with 32 g of oxygen. How much carbon dioxide is produced?

44 g of CO₂

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