Mass vs Weight
Conservation of Mass
Volume
Density
Buoyancy
100
Define Mass
How much of something there is
100
What is the law of conservation of mass?
Matter cannot be created or destroyed, only transformed
100
Define Volume
How much space matter takes up
100
Define Density
The relationship between mass and volume, how much of something there is within a certain volume
d = m/v
100
Define Buoyancy
The ability to float
200
Define weight
How strongly one thing is attracted to another by gravity
200
What is the first law of thermodynamics?
Matter and energy cannot be created or destroyed, they can only change form
200
What is the volume of a box with the following dimensions?
Length = 2 cm
Height = 10 cm
Width = 4 cm
80 cm3
200
How can density be helpful for a scientist that wants to differentiate between different metals?
They can use density to determine which metal they are looking at. Gold and copper can sometimes look similar, but gold is much more dense!
200
If an object is denser than its surroundings, will it:
a) Float
b) Sink
c) Neither
b) Float
Buoyancy is related to density! If an object is less dense than its surroundings, it will be able to float
300
How do you measure mass?
Using a balance, grams
300
How does the water cycle demonstrate the conservation of mass?
Water evaporates from oceans, lakes, and rivers. It then forms into clouds and eventually falls as rain/other precipitation to provide water for crops and people. Water does not get used up or lost in this process, instead it continues to cycle!
300
Name a scientific tool that can be used to measure liquid volume
Graduated Cylinder, Beaker
300
If two substances have the same volume, but different densities, how can you tell which one is more dense?
Remember: d = m/v
With a balance or a scale! If their volumes are the same, the object with greater mass or weight is the denser one
300
Why do boats float?
They are buoyant in water - they are less dense than the water they are in
400
How do you measure weight?
Using a spring scale, Newtons or pounds
400
How do plants demonstrate conservation of mass? Which nutrient cycle do they play an important role in?
The Nitrogen Cycle
400
What is the volume? Bonus: What is the name of the curve shown here?
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24mL, Meniscus
400
Name one example of a positive use of items that are NOT dense (objects with very low density)
Insulation! The air pockets help insulate buildings from shifts in temperature
400
Assuming these liquids cannot mix, which order would they settle at?
a) Water = 1 g/mL
b) Vegetable Oil = 0.93 g/mL
c) Flubber = 1.5 g/mL
Flubber at the bottom, then water, then vegetable oil
500
What would your mass be in outer space?
Zero!
500
How is the mass of water changed when it becomes ice?
It does not change!
500
What are 2 methods of measuring the volume of an irregularly shaped object?
1. Displacement
2. Overflow
500
Which is higher density, left or right?
The cube on the right
500
Why is it important to life that ice is less dense than water?
If ice was more dense, then lakes would freeze from the bottom up and life would be choked out. Instead, ice helps insulate the water below it.