Mixtures
What is a mixture?
Mixtures are two or more substances put together and can be easily separated
What is a solution?
a mixture that is formed when one or more substances dissolve in another substance
A student wants to increase the concentration of particles dissolved in a solution. What step should the student take?
A. Increase the solvent.
B. Decrease the amounts of both solute and the solvent equally.
C. Increase the amount of solute.
D. Increase the amounts of both the solute and solvent equally.
C. Increase the Amount of solute
Which would most likely take the longest to dissolve?
A. Sugar Cube in hot water
B. Powdered sugar in hot water
C. Sugar Cube in Cold water
Sugar Cube in cold water
Which would make a sugar and water solution more dilute?
A. Let the water evaporate away.
B. Add sugar and Stir
C. Add water and Stir
D. Heat to boil away water
C. Add water and stir
Which are examples of a mixture?
-Glass of water
-Salad
-Bowl containing plastic, wood chips, and metal
-Lemonade and Ice
-Red Pens
Salad, Bowl containing plastic, wood chips, and metal, lemonade and ice
What part of a solution does the dissolving of another substance?
Solvent
How can a student make orange juice less concentrated?
Add more water (solvent)
Michael wants to quickly dissolve a sugar cube in water. What are some methods he can use to make the sugar cube dissolve faster?
Crush the sugar cube and stir the sugar in warm water.
Which of the following is always true about the particles that make up matter?
A. They can only be found in solid substances.
B. They are too small to be seen with only our eyes.
C. They are the same size in all substances.
D. They are locked into regular Arrangements.
B. They are too small to be seen with only our eyes
What type of mixture can be easily separated into its different parts?
Heterogeneous mixture
What is a solute and what is a solvent?
Solute- a substance that dissolves in a solvent to form a solution (Salt, Sugar)
Solvent-a substance in which a solute dissolves to form a solution (water or any liquid)
You have 2 different salt solutions with the same amount of water. How can you tell which salt solution is more concentrated? (Without tasting it )
By weighing both salt solutions on a balance scale. The solution that weighs the most has a higher concentration.
Sugar cubes are dissolved in a beaker of water. Which of the following changes would help the sugar dissolve faster?
A. Using a larger sugar cube
B. Freezing the water
C. Stirring the mixture
Stirring the mixture
A solution is a special kind of mixture. Some substances can dissolve in water; some substances cannot. Which of the following objects will dissolve in a solution of water?
Oil, Sugar, marble, Pepper?
Sugar
A teacher places sand and rocks in a bowl. The teacher then stirred the contents of the bowl using a spoon.
Is the bowl a mixture or solution? How can you separate these substances if possible?
The bowl is a mixture! To separate these items you can use a screen/sieve/sifter
What is it called when a substance is changed from a liquid to a gas?
Evaporation
A student makes two solutions, A and B. Solution A contains 100 mL of water and 20g of sugar. Solution B contains 200 mL of water and 20 g of sugar.
Which solution is more concentrated, and why?
Solution A because it has the least amount of solvent than Solution B.
Which substance would dissolve faster?
Sugar cubes or granulated sugar?
Granulated Sugar
What happens to the particles in matter when it is heated up?
A. Particles remain in place
B. Particles speed up
C. Particles slow down
D. Particles disappear
B. Particles speed up
What type of mixture looks uniform throughout?
Homogenous mixture
What type of solution is so concentrated that the solute will no longer dissolve?
Supersaturated
Which solution has the highest concentration of salt?
Solution 1: 500 mL of Water and 100g of Salt
Solution 2: 500 mL of Water and 50g of Salt
Solution 3: 500 mL of Water and 200g of Salt
Solution 4: 500 ML of Water and 150g of Salt
Solution 3
Ms. Tran let her coffee sit for a while and now it is cold. She wanted to add sugar to it, but it did not dissolve quickly. What are some ways that she can do to make her sugar dissolve faster?
Heat her coffee back up to make it warm and stir up the sugar
Ms.Tran was conducting an experiment in class. She heated a cup of water for each teacher at different times, recorded the water temperature, and then dissolved 2 teaspoons of salt in the water.
Which teacher do you think the salt will dissolve the fastest for?
-Ms. Stanard: Time Heated- 15 Seconds, Temp. Water-30 DegreesC
-Mrs. Lewis: Time Heated- 30 seconds. Temp. Water- 35 DegreesC
-Mrs. Jacobson: Time Heated- 45 Seconds, Temp. Water-42 DegressC
-Mrs. Cowart: Time Heated- 1 Minute, Temp. Water-50 DegreesC
Mrs. Cowart