surprise box
Two beakers contain 100 mL of water. One has 5 g of sugar dissolved, the other has 20 g dissolved. Which one is more concentrated?
the one with 20 g of sugar
What is the difference between a compound and a mixture? Name two differences
Mixture = physically combined, can be easily separated, substances do not react with each other; compound = chemically bonded, difficult to separate. substances react.
Which method would you use to separate sand and water?
Filtration
What is chromatography used for? How does it work?
To separate substances in a mixture (like inks).
Define solution, solvent, and solute
solution = solvent (liquid that dissolves) + solute (dissolved solid)
Yellow sulfur powder is insoluble in water. If I mix it with water and then filter it, what will be the colour of the filtrate?
transpareeeent
Is air a mixture or a compound? Explain why.
Mixture, because gases are not chemically bonded
How can you separate salt from saltwater?
Evaporation using a condenser
What example of using chromatography did we discuss in class?
black ink in marker
Make examples for soluble and insoluble substances
Ms. Damina decides
If we want to know what colours are present in a black PERMANENT marker, what should we use instead of water in chromatography?
alcohol
Water is made of hydrogen and oxygen. Why is water not considered a mixture?
Because hydrogen and oxygen are chemically bonded and form a molecule.
Best way to separate iron from sand?
using a magnet
What is a chromatogram?
A chromatogram is the pattern of colored spots you see after chromatography.
Is milk a solution? Why?
no, it's cloudy, solutions must be transparent. it's a suspension
Three types of variables. Make examples for each.
Ms. Damina decides
Iron and sulfur are mixed together. Is it a mixture or a compound? After heating, a black solid forms that cannot be separated with a magnet. Is this a mixture or a compound? How is it called?
Mixture, after heating - compound, called iron sulfide
Water + salt + sand. How will you separate them?
2. use a condenser
Why do different colors travel different distances on the paper?
Different solubilities and attractions to paper.
Define “saturated solution.”
a solution that contains the maximum amount of solute that can dissolve at a given temperature.