Graphs
When looking at a mass vs. volume graph, how can I tell which substance is the most dense?
The steeper the slope, the higher the density.
The amount of matter in an object
mass
phase change from solid to liquid
melting
What is the equation for pressure?
pressure = force/area
List 3 physical properties
color, size, shape, density, volume, mass, etc
What is the density of the object from the graph?
0.75g/cm3
How much space an object takes up
volume
What is an example of a physical change?
cutting something, phase change, crumbling a paper
What is the equation for density?
density = mass/volume
What unit (label) is used for area?
m2 or cm2
During which interval is the liquid evaporating into a gas?
Interval 4
Characteristic that is not able to be observed without changing the identity of the substance.
chemical property
phase change from a gas to a liquid
condensation
Find the volume of an object that has a density of 10.2 g/mL and a mass of 30g
2.9 mL
Which substance has a higher density?
Substance one has a mass of 15g and a volume of 100mL and substance two has a mass of 20g and a volume of 350mL.
Substance 1
Explain what is happening in interval 2
The solid is changing to a liquid and the temperature is staying the same.
Two substances chemically combined
compound
What happens to the particles of a liquid as it freezes?
Particles slow down, lose energy, move closer together
How much force is on a car if its tires cover an area of 4m2 and each tire exerts a pressure of 1000Pa?
16,000N
An experiment to test how different amounts of sunlight impact plant growth in a garden. Which is the independent variable and which is the dependent variable?
independent - sunlight
dependent - plant growth
Fill in the blanks:
In interval ______ thermal energy is being added to increase the _______ energy of the substance.
1 kinetic
A nonuniform mixture that allows for contents and particles to be seen
heterogeneous
Phase change from a solid directly to a gas
sublimation
A boy with a mass of 80kg stands on the grass in his shoes that measure 25cm2. A girl with a mass of 60kg stands in front of him wearing sandals with a heel that only covers 0.1cm2. Who while exert more pressure on the grass?
the girl
How do mass and volume impact density?
As mass increases, density increases. As volume increases, density decreases.