Phys/Chem Changes
Mixtures/Solutions
States of Matter
Changes of state
100
Describe the difference between a chemical change and a physical change
Chemical-creates a new substance, physical-changes form or appearance
100
Is boba lemonade a mixture or solution, why?
Mixture, you can separate the pearls
100
No definite shape, no definite volume
Gas
100
If matter cannot be created or destroyed, why is there less water in my pot after I boil it?
Some of the particles have turned into gas
200
Name 2 signs that a chemical change has occurred
Heat, light, odor, color change, gas bubbles, formation of a solid
200
A student mixed together some sawdust and iron shavings. After he mixed them together, it was difficult to see the difference between the two. Did he create a mixture or a solution and why?
A mixture, because the iron can be separated with magnet.
200
No definite shape, definite volume
Liquid
200
What happens when water reaches 100*C?
It reaches its boiling point
300
During the penny experiment, describe how the steel nail turned copper. Use the words physical change OR chemical change in your answer.
The pennies underwent a physical change when the vinegar removed a layer of copper. Then, the nail underwent a physical change as the copper was added to the nail.
300
What are the 2 key characteristics of a mixture?
Materials keep their own properties, and it is easily separated.
300
Definite shape, definite volume
Solid
300
If I wanted to turn solid water into a gas, what exactly would I have to do? Be specific.
Heat the ice to 32*F and it will begin to melt, then continue heating until 212*F and it will boil.
400
Which substance underwent a chemical change?
Bread
400
What does the investigation in the diagram demonstrate?
A. mixing a mixture
B. mixing a solution
C. separating a mixture
D. separating a solution
C. Separating a mixture
400
What would happen if I took water that was 80*F , and cooled it to 40*F?
It would get cooler, but would remain a liquid.
400
Over time, what will happen to the mass of water in a pot as it boils?
It will decrease, as some water is turning into gas
500
Kayla’s mom is cooking an egg in a pan. As the egg cooks, part of it changes color from clear to white. Kayla can smell the egg cooking. The egg changes from a liquid to a solid.
Which is NOT a sign that a chemical change is occurring with the egg?
A. new smell
B. color change
C. temperature change
D. formation of a solid
C. temperature change is NOT a sign
500
I mixed a teaspoon of sugar into my lemonade, until it completely dissolved. In this solution, what is the solute and the solvent?
Sugar is solute, lemonade is solvent
500
What state of matter would water be in at 220*F?
Gas, water boils at 212*F
500
Water kept at 0*F will be in which state of matter?
Solid ice, water freezes at 32*F