Mixtures
What is a mixture?
When you mix two or more substances together.
What is a solution?
When one substance dissolves into another substance
What are the three main states of matter?
solids, liquids, gases
What are the 5 steps of the scientific method?
1. Make an observation
2. Ask a question
3. Form a hypothesis and make a prediction
4. Do a test or experiment
5. Analyze data and draw a conclusion
What is an example of a mixture?
trail mix, sand and water, salad, pile of clothes, cereal and milk, etc.
Which of these is not a solution:
a) Lemonade
b) Sand and water
c) Sugar in tea
d) Saltwater
sand and water
Which state of matter has a definite shape and a definite volume?
solid
True or False: Cutting paper is a chemical change.
False, physical change
What do scientists call the information they collect during an experiment?
data
True or False?
Coffee is a mixture
False
If you mix oil and water, do they form a solution? Why or why not?
No, because oil does not dissolve in water
Which state of matter has a definite volume but no definite shape?
liquid
Which is a chemical change:
a) Ice melting
b) Burning wood
b) burning wood
What is a hypothesis?
A guess you can test
How can you separate salt from saltwater?
evaporation
Which state of matter has no definite shape and no definite volume?
gas
Breaking glass into tiny pieces is what kind of change?
physical change
What do scientists use the scientific method for?
To solve problems and answer questions
True or False?
Sweet Tea is a solution
True
Steam cools into water droplets on a window. What change of state is this?
condensation (gas---> liquid)
True or False: Physical changes can usually be reversed, but chemical changes usually cannot.
True
True or False: Scientists only use the scientific method in a lab.
False. We did the penny experiment and egg lab in our classroom!