Classifying Matter
What type of matter is particle picture 1?
Compound
Which separation method would you use to remove iron filings from sand?
Magnetism
Ice Melting
Physical Change
The separation technique used to separate the beads in our separations lab.
Manual separation
What type of matter is particle picture 2?
Element
Which separation method is best for removing dirt from water?
Filtration
Name one key difference between a physical change and a chemical change.
A physical change does not create a new substance, while a chemical change does.
The separation technique used to separate the iron filings in our separations lab.
Magnetism
What type of matter is particle picture 3?
Element
You have a mixture of sand, salt, and iron filings. What steps would you take to separate each substance using different methods?
1) Use a magnet to remove the iron filings. 2) Pour water into the salt and sand mixture. 3) Use filtration to remove the sand. 4) Evaporate the water to retrieve the salt.
A piece of wood is burned, what are two signs that a chemical change has occurred?
Color change, gas production (smoke), and new substances formed (ash).
Name an observation from the aluminum ball in copper (II) Chloride solution lab.
Answers vary
What type of matter is particle picture 4?
Homogenous Mixture
You have a mixture of dirt, sugar, and woodchips. Describe a step-by-step plan to completely separate all four substances.
1. Manually take out the woodchips
2. Pour water into the dirt and sugar mixture
3. Run the mixture through a filtration system
4. Evaporate the water to be left with the sugar
Explain why dissolving sugar in water is a physical change, but baking a cake is a chemical change.
Dissolving sugar is a physical change because no new substance is created—it can be reversed. Baking a cake is a chemical change because heat causes new substances to form that cannot be reversed.
The separation technique used to separate the sand and salt in our separations lab.
Filtration
What type of matter is particle picture 5?
Heterogenous Mixture
After a storm, a homeowner’s backyard pond has become polluted with dirt, leaves, and small pieces of metal debris from a nearby construction site. What separation techniques should they use to clean the pond, and in what order?
1. Manual Separation – Large leaves and debris can be removed by hand or with a net.
2. Magnetism – A magnet can be used to pull out any small metal pieces from the water.
3. Filtration – A filter can be used to trap small dirt particles while allowing clean water to pass through.
A metal bicycle left outside in the rain starts to rust. Explain why this is a chemical change.
Rusting is a chemical change because a new substance (rust) is formed.
Magnesium strips are placed into hydrochloric acid. Is this a chemical or physical change AND what are two signs?
Chemical - fizzing/bubbling and temperature change