Middle School Chemistry

States of Matter

100

This is the state of matter in which molecules are the most dense.

What is a SOLID

200

In this state of matter the molecules move very fast and are very spread out

What is a gas

300

This is the phase change that occurs when a liquid becomes a solid.

What is freezing

400

In this state of matter the molecules can slide past one another

What is a LIQUID.

500

List the 3 states of matter in order from the lowest to the highest energy level.

What is solid, liquid, gas

Elements and Compounds

100

True or False?

Gold (Au) is a compound

False.  Gold is made up of only gold atoms.  It is an element on the Periodic Table of Elements

200

True/False: Compounds are made up of two or more different elements held together with chemical bonds

TRUE

300

This table shows the "building blocks" of everything on earth

The Periodic Table of Elements

400

Table Salt (NaCl) is an example of a ___________

What is a compound

500

The smallest part of an element is called

What is an atom?

Elements Compounds and Mixtures

100

He (Helium) and Ca (Calcium) are an example of

What is a element

200

CO is an example of a(n) _____________

What is a compound?

300

Air is a physical combination of O₂, CO₂, N₂, and other gases.  Air is an example of________________ 

What is a mixture

400

These cannot be broken down into simpler substances; everything around us is made up of combinations of them.

What are elements?

500

This is physical combination of two or more substances (ex. elements and compounds or 2 different elements)

What is a mixture?

Chemical and Physical Changes

100

In this reaction, a solid becomes a liquid when heat energy is added. (Chemical or Physical)

PHYSICAL CHANGE

200

In this reaction, a substance changes color and a gas is released. (Chem or Phys)

CHEMICAL CHANGE 

300

In this reaction, there is a temperature decrease when 2 substances are mixed together. (Chem or Phys)

CHEMICAL CHANGE

400

List at least 4 indicators of a chemical change.

What are color change, gas is produced, smell is produced, temperature change, light is produced, solid is formed

500

The word REACTANTS refers to _______________________ in a chemical reaction

A. FINAL substances / products

B. ORIGINAL (starting) substances

B. ORIGINAL SUBSTANCES

EXTRA FUN

100

Anything that has mass and takes up space is a kind of

What is matter?

200

H₂SO_{4 is an example of a ________________________}

What is a COMPOUND

300

The number of HYDROGEN atoms in H₂SO₄

What is 2?

400

The number of SULPHUR atoms in H₂SO₄

What is 1

500

A teacher demonstrates a chemical reaction for the class. Which of these would NOT show evidence that a chemical reaction occurred? a) change in color b) change in shape c)formation of a gas

What is change in shape