Mass
How do I measure the mass of a cube?
Put it on a scale
How do I find the volume of a cube?
Length X Width X Height
What unit do we use for density?
g/cm^3
An object with a density of 1.19 g/cm^3
NO
Is hot water more or less dense than room temperature water?
Less dense
How do I measure the mass of an irregular object?
Put it on a scale
How do I find the volume of an irregular object?
The water displacement method.
How do we calculate density?
Mass divided by volume (Mass/Volume)
An object with a density of 0.99 g/cm^3
YES
Is cold water more or less dense than room temperature water?
More dense
What is the definition of mass?
The amount of matter in an object / How heavy something is
What is the definition of volume?
The amount of space something takes up
What is the definition of density?
The relationship between mass and volume.
Why does hot water float on room temperature water?
Because hot water is less dense
If two objects have the same mass but different volumes, which object will be denser?
The object with less volume will be more dense because the same amount of stuff is fitting in a smaller space.
If two objects have the same volume but different masses, which would be denser?
The one that has more mass because density is about how much stuff is in how much space.
Explain low density on the molecular level. What would you expect about the atoms/molecules?
Big atoms/molecules, that do not have a lot of mass and are spread out.
An object with a mass of 200g and a volume of 150 cm^3
NO
Why does cold water sink in room temperature water?
Because it is more dense
Explain how I could use a digital scale and a graduated cylinder to find the mass of an amount of water.
I could find the mass of the water and the graduated cylinder on the scale, then subtract the mass of the graduated cylinder to get the mass of the water.
Explain every step of the water displacement method.
First, I record the initial water level. Then I drop the object into the graduated cylinder and record the final water level. Then I subtract the initial water level FROM the final level (take the small number from the big number) to get the volume of the object. Then I divide the mass by the volume to get the density.
Explain high density on the molecular level. What would you expect about the atoms/molecules?
Small atoms, with a lot of mass, packed closely together.
How do I know if an object will sink or float? Why?
Water has a density of 1 g/cm^3 so anything with a higher density will sink, and anything with a lower density will float.
Explain why hot water is less dense than cold water on the molecular level.
Hot water is more dense than cold water because the molecules in hot water move faster and are slightly farther apart.