8TH Matter and Periodic Table

Which of the following cannot be broken down to a simpler substance?

Which state of matter is shown in the image below?

In a chemical reaction bubbles indicate that 

 A pure substance that is formed when atoms combine chemically

A brick sinks in water so it's density must be 

After you boil salt water a white solid is left behind.  This proves that salt water must be a

Which of the following is a mixture?

What is the difference between Fluorine and Oxygen?

What do we know about Carbon and Silicon?

Where would a substance with a density of 0.9 g/mL³ be on this column?

Which element has 12 protons?

How does matter react to heat?

Which of the following is a nonmetal?

In a fire, wood is converted ash and smoke, this is an example of 

Which of the following DOES NOT describe a metal?

Mass cannot be created or destroyed

Which of the following is NOT evidence of a chemical change?