Density
What is the formula for density?
m=d/v
What is the meaning of viscosity?
The resistance to flow
Boiling water is an example of which type of change
physical
What is the definition of buoyancy
ability to float
What type of change is rust forming on a metal and why?
Chemical, because a new substance was made
What is the density of an object that has a mass of 50g and a volume of 10 cm3
10 g/cm3
If two objects raced, would the object with more or less viscosity win?
Less
What is the main difference between physical and chemical changes
either
Physical is reversible
Physical does not change composition
Why is one object able to float on another
It is less dense
Ice melting is an example of what type of change and why?
Physical, the chemical composition is still the same
what is the volume of an object that has a density 19.2 g/cm3 and a mass of 123.4 g
6.4 cm3
if two objects of the same material "raced" and one of them liquids reached the bottom before the other what was the difference between them?
They were different temperatures
Name 3 clues that a chemical change has happened
bubbles form, color change, temperature change, precipitate formed, etc
Which of these will float on water?
D=10.23g/cm3
D=.23g/cm3
D=.10g/cm3
D=10g/cm3
D=23g/cm3
.23/.10
If we have 4 objects all of different masses, but same material, would there be any that are more or less buoyant and why?
No, because they would have all the same density
What is the mass of an object that has a density of 6.7 g/cm3 and a volume of 274.9 cm3
1,841.8 g
A student has these objects:
Rulers, graduated cylinders, marbles, a timer, and containers filled with different liquids.
The student wants to test which liquid is the most viscous, create an experiment on how he can do that
Up to my discretion if it can work
Why would an electrical current being run through a wire be considered a physical change
There is no change in the composition
Why is it a cruise ship, made of metal, which is more dense than water, is able to float in the ocean?
It is filled with air which decreases the desnity
What happens to an objects conductivity as it changes size and why?
Nothing, because it is the same material no matter the size
What is the density of a rectangular object that has a width of 7.1 cm, height of 10.8 cm, a length of 16.6 cm and a mass of 2004.9 g
1.6 g/cm3
What happens to a substances MOLECULES when the temperature changes that allows it to be more or less viscous
They speed up their movements or slow it down
Tell me how when you eat there are physical AND chemical changes involved
When you chew it is physical and digesting it is chemical
Order these object if they were to be placed in a beaker from TOP to BOTTOM
1: Mass= 24.6g Volume=12.3 cm3
2. Mass= 100.2 g Volume =212.6 cm3
3. Mass= 50.2 g Volume=30.8 cm3
4 Mass= .4 g Volume= .5cm3
2,4,3,1
What would make one gas float on top of another, and why?
Their densities are different, because the molecules are still more or less spaced out just like a gas