Fluids

Question 1

What is a fluid? Do fluids have a mass and volume?

Answer 1

Fluids are gases and liquids. They do have mass and volume. Fluids flow.

Question 2

What is density? What is the formula for density?

Answer 2

Density is the mass to volume ratio. Density formula:

D= M/V

Question 3

What is viscosity? How do we determine the flow rate of a substance?

Answer 3

Viscosity is how thick a substance is, or the force resisting it to flow. We can determine flow rate by timing it.

Question 4

What is the relationship between viscosity and flow rate What is the relationship between flow rate and temperature? Give an example.

Answer 4

The thicker (more viscous) a substance, the warmer it is, and the faster it flows. In example, molasses will have a slow flow rate, but warmer molasses will be slightly faster.

Question 5

What is the relationship between temperature and density?

Answer 5

The warmer the substance the less dense it is.

Question 6

How can we determine the density of a substance? What experiment did we do to show this?

Answer 6

We can determine the density of a substance by dividing its mass by volume. For our experiment, we filled beakers to different levels, took their mass with and without water, and took the mass of the substance to find density.

Question 7

If you have a hole at the top of a bottle and another equally sized hole near the bottom, where would there be more pressure (and a faster flow rate) of water flowing out?

Answer 7

The hole at the bottom would have higher pressure.

Question 8

For the next 4 questions, use the density chart below
https://drive.google.com/a/rhms.ca/file/d/0B7Fe8sUm2li1RDJfWVp5RjFJeGM/view?usp=sharing

a) A sample of liquid has a mass of 3.78 g and a volume of 3.0mL. What is its density, and what is the identity of the liquid?
b) Calculate the mass of 50 cm3 of aluminum.
c) How much space would 1 kg of water occupy?
d) What is the volume of a 23.61 g piece of iron?

Answer 8

a)
D=m/v
D=3.78g/3m
D= 1.26 g/mL

b)
M= V x D
M = 50 cm x 32.7 g/mL
M=135 g

c)
V= m/d
V=1000g/1g/ml
V=1000g or 1kg

d)
V= m/d
V=23.61 g/ 7.87 g/mL
V=3mL

Question 9

Use diagrams to show whether or not liquids and gases are compressible. Label your work clearly. (Include before and after pictures)

Answer 9

Liquids cannot be compressed. But if you really try, maybe 2 or 3 ml.

Gases can be compressed. But not all the way (maybe like 5mL unpushable.