CW1 & 2: Chemical and Physical changes / Matter

Anything that occupies space and has mass is called?

• Matter

• Protons

• Molecules

• Elements

Matter is made up of what?

• Atoms

• Space

• Grams

• Compounds

The law of conservation of mass states...

• Energy is need to create new mass in substances

• Energy is released when substances' mass is destroyed

• Mass of a substance cannot be created or destroyed only changed from one form to another

• New matter is formed as atoms of substances combine

In a solid, the atoms are...

• Spread loosely

• Can flow over each other

• Free to move in all directions

• Are packed tight

A mixture is..

• 2 or more substances mingled together but not chemically combined

• 2 or more substances chemically combined

• 2 or more substances which are hard to separate

• A substance chemically combined

Physical changes involve..

• Swapping of electrons

• Sharing of electrons

• No new substances

• A chemical reation

In order to separate a mixture of alcohol and water what separation technique should be used?

• Evaporation

• Chromatography

• Filtration

• Distillation

What separation technique would be used to separate water and sand?

• Distillation

• Filtration

• Evaporation

• chromatography

Which of the following is a mixture?

• Seawater

• Water

• Carbon dioxide

• Methane

Which of the following is a chemical reaction?

• A nail rusting

• Candle wax melting

• Salt dissolving in water

• Ice cream melting