Chemistry Review!

What kind of change is a phase change?

• Physical - it's still the same substance
• chemical - it's made of chemicals 

A chemical change happens when...

• a substance is changed at the atomic level 
• bonds are broken and formed 
• a new substance is made
• all of the above! 

What is a variable in an experiment?

• Something that stays the same

• Something that might change

What are the three states of matter?

• Solid

• Wet

• Gas

• Frozen

• Liquid

How do you make a mixture?

• By combining 2 or more substances.

• By pouring lots of one substance into a cup.

• By stirring water

What do you call the red particles in this mixture?

• Solvent

• Solute

• Solution

What do you call the blue substance in this mixture?

• Solvent

• Solute

• Solution

Which two words describe a mixture where you CAN'T see the different parts?

• Solution

• Homogenous Mixture

• Heterogenous Mixture

Do solids have high or low kinetic (movement) energy?

• Low (the particles don't move very much)

• High (the particles move around lots)

What is an observation in an experiment?

• What you think will happen.

• What you see happen.