A student takes bread and slices it into 10 slices. Chemical or physical change? WHY
Physical, no new substances created
100
The color blue
physical
100
How old is Sergio?
36
200
Find density if:
Mass is 50 g
Volume is 10 mL
Density = 5 g/mL
200
What units do we use for density?
grams per milliliter (g/mL) or grams per cubic centimeter (g/cm3)
200
Your friend decides to toast bread but leaves it in too long. The bread turns black and fills the room with smoke. Chemical or physical change? WHY?
Chemical- color change, smoke (gas), new substance created
200
Flammability (Burns)
Chemical
200
What is Aria's maiden name?
Silverman
300
Find volume if:
Density is 2.98 g/mL
Mass is 78 g
Volume is 26.2 mL
300
What is the density of water (with units!)
1 g/mL
300
You blow dry your wet hair. Chemical or physical change? WHY
Physical- no new substances are being created, but water is evaporating
300
Boiling point
Physical
300
What year was the Greenwood School founded?
1978
400
Find mass if:
Density is .65 g/mL
Volume is 909 mL
mass is 590.85 g
400
List the materials in order from most to least dense:
honey, sulfur gas, frozen water (ice), liquid water, iron nail
Iron nail, honey, liquid water, frozen water, sulfur gas
400
Is evaporation a chemical change? WHY or WHY NOT?
No, it is a change of state and there was no new substance created.
400
How do you tell the difference between chemical and physical properties?
Physical- observed through senses and determined without destroying (Changing) matter
Chemical- indicates how a substance reacts with something else, it will be a new substance after the reaction.
400
NAme three married couples that work at Greenwood
Rich and Aria
Kelly and Sergio
Matt and Annie
Marcia and Phil
Eddie and Marcela
Bob and Natasha
500
You have a liquid with a mass of 54 g and volume of 202 mL.
Is the liquid more or less dense than water?
Less
500
Explain how a thermometer works using the principles of density.
As temperature increases, molecules in the thermometer get more excited and take up more space (greater volume) as they bounce off each other. This leads to the liquid rising. The hotter the material, the less dense.
500
Name 3 of the four ways to tell if a chemical change took place
Color change
Temperature change
2 liquids to a solid
bubbles or a gas
500
Describe both chemical and physical properties of a 3x5 notecard