Mixtures & Solutions (P.5.5B)
What is a mixture?
A combination of substances that keep their properties.
It can be easily separated.
What happens to the substances in a mixture?
They keep their original properties.
What is concentration?
The amount of solute compared to solvent.
Name one variable that affects dissolving rate.
Temperature, stirring, particle size, surface area.
How do you separate salt from water?
Use evaporation.
Give an example of a solution.
Salt water, lemonade, or sugar in tea make ________.
Do the properties of substances change in a solution?
Yes, especially when a solute dissolves in a solvent.
Which has more solute: dilute or concentrated?
Concentrated has more solute.
How does stirring help something dissolve faster?
It spreads particles throughout the solvent faster.
What method separates iron from sand?
Use a magnet.
How are mixtures and solutions similar?
Both combine two or more substances.
Describe what happens to sugar when mixed in tea.
It dissolves and forms a solution with the tea.
How do you increase the concentration of salt water?
Add more solute or remove some solvent.
What does temperature do to dissolving rate?
It increases the speed of dissolving.
What tool is used for sifting?
A sieve or mesh screen.
How are mixtures and solutions different?
Solutions involve one substance dissolving; mixtures do not.
How can we tell if a mixture formed a solution?
One substance will dissolve in the other.
If you double the water in a solution, what happens to concentration?
It becomes more dilute.
Why do small particles dissolve faster?
They have more surface area for the solvent to reach.
What is the first step of the engineering design process?
Define the problem.
Can all mixtures be easily separated? Why or why not?
No, some mixtures like solutions are harder to separate.
Do substances in a mixture form a new substance? Why or why not?
No, The substances can be separated physically.
Explain how you can compare a concentrated solution to a diluted one?
Which dissolves faster: sugar cube or crushed sugar? Why?
Crushed sugar, because of greater surface area.
Describe how you would separate sand, salt, and iron filings.
Use a magnet for iron, filter for sand, evaporate saltwater.