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WorksheetsSTEHN Unit 2 review
Total questions: 56
Worksheet time: 1hrs 27mins
A physical change...
changes the physical properties of an object, but does not create a new substance.
creates a new substance and cannot be undone.
Browning of an apple after it is cut is an example of ____.
physical change
chemical change, NOT reversable
reversible change
biological change
Which of the following is a physical change?
Rusting of iron
Melting of wax
Burning of coal
Curdling of milk
Physical or Chemical Change? Making a paper airplane.
Physical Change
Chemical Change
Which beaker is more diluted?
Which beaker is more concentrated?
Match the following
Diluted
More solvent, less solute
Dissolution
Dissolving
Concentrated
More solute, less solvent
Aqueous
Water
Rate of Dissolution
Speed of dissolving
A chemical change forms something ' (a) , while a physical change only changes the ' (b) ' The chemical change may a ' (c) formed, while a physical change is " (d)
Speed of light
E=MC2
Sand on the beach
What is a solute?
The substance that does the dissolving in a solution.
The substance that is dissolved into the solution.
The mixing of different substances.
The process in which neutral molecules lose or gain electrons
Which is an example of a solute?
Milk
Sugar
Water
Ginger Ale
Which is not an example of dissolving?
Salt in water
Sugar in water
Water in water
HCl in water
A solution is a ___________mixture.
heterogeneous
homogeneous
concentration
ionic
You can make a solution more concentrated by adding more __________.
solute
solvent
water
solution
What factors can affect the rate of dissolution of a solute in a solvent? (Pick 2)
Color and taste
Temperature and surface area
Smell and viscosity
Agitation and concentration
Label the parts of the mixture correctly.
solution
solvent
solute
Label the following
Solution
Solute
solvent
solute
solvent
solvent
solute
When one of the parts of the solution is water we call it _________.
water stuff
water mixture
aqua-man
aqueous
The main substance in a solution that dissolves other substances.
solute
solvent
solution
solubility
A solution where water is the main liquid doing the dissolving.
surface area
dissolution
aqueous solution
agitation
The amount of area covered by the surface (outside) of an object.
Rate of Dissolution
Surface Area
Concentration
Agitiation
How fast a substance dissolves in a liquid.
Rate of Dissolution
Surface Area
Aqueous Solution
Solubility
What is a solution?
A mixture of water and pepper
A mixture where the properties differ from one part to another
A mixture that has the same properties throughout
A mixture that has 3 different gases mixed together
This is an example of a
Solution
Mixture
Sugar dissolved in water is an example of a
Homogeneous Mixture
Heterogeneous Mixture
Which of the following should be done to make the solute dissolve faster in the solvent?
stir (agitate) the solute
freeze the solute
decrease the temperature of the solvent
increase the particle size of the solute
Organize these options into the right categories
Tearing paper
Organize these options into the right categories
salt
water
Which of the following is an example of a chemical change?
Boiling water
Freezing water
Burning wood
Melting ice
Describes a solution that has a small amount of solute dissolved in the solvent
Suspension
Colloid
Solution
Mixture
Dilute
This part of the solution is present in smaller amounts and gets dissolved
Homogeneous mixture
Heterogenous mixture
Tyndall Effect
Solute
Solvent
This part of the solution is present in larger amounts and does the dissolving
Homogeneous mixture
Heterogenous mixture
Tyndall Effect
Solute
Solvent
A solution that has a lot of solute dissolved in the solvent; opposite of dilute.
Solubility
Saturated
Unsaturated
Supersaturated
Concentrated
Solutions with little solid dissolved in a volume of water are:
concentrated
dilute
dissolved
soluble
Solutions with a lot of solid dissolved in a volume of water are more:
concentrated
dilute
dissolved
soluble
What substance is often called the "Universal solvent"?
Water
Ethanol
Salt
Blood
__________ are made up of solutes and solvents.
Solutions
Suspension
Colloid
What does it mean to dilute a solution?
lower the concentration of solute per solvent
increase the concentration of solute per solvent
You can make a solution more concentrated by adding __________.
solute
solvent
water
Is a rotting banana an example of a physical or a chemical change?
Physical Change
Chemical Change
Which of the following can increase the dissolving rate of a substance the most?
mixing
freezing
heating it up
adding more substance.
Classify the following as Chemical Change or a Physical Change.
Chopping wood
Ice cube melting
Steam from a shower
Burning wood
A bike rusting
What does this solubility curve show?
Solubility increasing as temperature increases
Solubility decreasing as temperature decreases
Solubility decreasing as concentration increases
Solubility is not affected by temperature
If i DECREASE the temperature what happen to the rate of dissolution?
The rate of dissolution is not affected by temperature
The rate speeds up. MORE solute is able to be dissolved
The rate slows down. LESS Solute is able to be dissolved
Cheese
How can i increase the rate of DISSOLUTION?
Cheese
Agitate the solution
Look at the solution
Add food coloring
We dissolved sugar and a sugar cube in the lab. I dissolved, but what happened to the particles?
The sugar had a chemical change
Cheese
The sugar ran and hid from the solvent
The sugar gets smaller in size (Smaller particles) and increases its surface area.
Increasing the temperature is a way to affect the rate of DISSOLUTION, as we discussed in class (speeding it up), what happens if I LOWER the temperature
The rate of dissolution SLOWS down
The rate of dissolution SPEEDS up
The rate of dissolution stays the SAME
Cheese
What would happen in the lab if we put more salt in the water and it collected on the bottom as a clump of salt. What would we have to do to make to dissolve and become a clear solution?
Freeze the solution
Stir the solution
Look at the solution
Green
The definition of an AQUEOUS solution is a ' (a) and the word AQUEOUS means " (b)
"Homogeneous mixture
Heterogeneous mixture
'Water
Oil
Green
Air
Cheese
Aquaman
When we spoke in class about having a glass of water on a hot TEXAS summer day, and lett if outside, it would evaporate. what would happen if it was SUGAR water like out lab?
Everything would evaporate
The water would stay there and the sugar would increase
Salt would appear
The water would evaporate leaving the sugar behind, because it a physical change
Organize these options into the right categories
A rusty nail
Boiling water
Baking bread
Cooking Eggs
Breaking an egg
Tearing paper
When water evaporates, or freezes, or melts, we call that physical change a:
The new look of water
A confused molecule of water
Phase change. Just changing form
E=MC2
What is the UNIVERSAL SOLVENT?
Sand
Oil
Cheese
Water
What does precipitate mean? What is it?
Green
Cheese.. Actually cheddar cheese
cause (a substance) to be deposited in solid form from a solution. Usually a soliC
When you sweat on a hot day in the summer
What happens of you LOWER the temperature of a solution. What happens to rate of Dissolution. If we were to put the sugar from yesterdays lab in ICE COLD water?
The rate of dissolution would decrease
The rate of dissolution would increase
The rate of dissolution would produce Mozzarella cheese
Stay the same
