Show:
Matter Basics
Density
States of Matter
Phase Changes
Energy
100
Anything that has mass and takes up space
What is Matter
100
What is Density
How much (matter, mass) stuff there is in some amount of space. D=M/V
100
Which state/phase of matter has a definite shape.
Solid because its molecules are so close and compact that the shape will be definite.
100
What is the name of the phase change when a SOLID becomes a LIQUID?
Melting
100
Remember the video clip we watched with the glass of ice? When the ice melted into a liquid, did that phase change require energy ( was energy added?) ??
Yes. Ice needs to absorb energy in the form of HEAT in order to melt. So ice melting requires energy ... aka you added heat or added energy
200
If I have two cups, can I place them both into my one and only cup-holder?
No. Matter is anything that occupies space and has mass. Only one cup can occupy the space in my cup-holder at a time.
200
How do you measure density? and What are the units.
D= mass (in grams or g) divided by volume (in mL or cm3) Units of Density: g/cm3 OR g/mL
200
Which state/phase occupies space?
All three states/phases occupy space. Remember, all matter occupies space (aka volume) and has mass.
200
What is the name of the phase change when a LIQUID becomes a GAS?
Vaporization When you have water boiling, forget about it, come back to find an empty pot. The water evaporated.
200
Remember the video clip we watched with the glass of ice? When the gas "hit the wall" and became a liquid, did that phase change require energy ( was energy added?) ??
No. Remember "hit the wall" in the example above means that the gas must have touched or bumped into something that was way colder, SO IT RELEASED ENERGY (lost heat).
300
A glass is dropped and broken. What type of change is this, Physical or Chemical?
Physical because nothing new was created.
300
What is the density of Water?
Density of water is 1.0 g/mL
300
Which state(s) does not have a definite shape?
Gas. The gas molecules are able to be by themselves floating around. They can all be in a place like a balloon, for example, but its not the gas that forms the balloon shape ... its the balloon's stretchy qualities that gives it shape.
300
What is the name of the phase change when a GAS becomes a LIQUID? Give an example.
Condensation A glass of ice water becomes "Sweaty"
300
Which of the following states have molecules that slide past on another?
Liquid.
400
Water is placed into the freezer to make ice. Is this a physical or chemical change?
Physical because nothing new was created... remember you can get your water back!
400
Which of the following has a GREATER density: water 1.0g/mL OR Silver 10.50g/cm3
Silver because it has a greater mass per unit of volume. Remember... the greater the number (when comparing densities) the greater the density.
400
Which states DO have a definite volume?
Solid and liquid.
400
What is the name of the phase change when a SOLID skips the liquid phase and becomes a GAS? AND Give one example of sublimation
Sublimation DRY ICE!!!
400
Which state of matter will fill their container COMPLETELY?
Gas. The random motion of the gas molecules allow them to fill their container COMPLETELY.
500
It is your birthday and your mother makes you breakfast. She made for you scrambled eggs and baked you a cake. Were these physical or chemical changes?
These are both chemical. Something new was created. You can't get the original (what you started with back!)
500
You have a graduated cylinder with 25 mL of water (density is 1.0 g/mL). You also have a another liquid (or substance) with a density of .45 g/mL ..... which one will be the top layer once you pour both into cylinder?
The liquid with density of 0.45g/L because it has a LOWER density than that of water. Remember, the greater the number the more dense. That means more mass per one unit of volume (space).
500
Which phase(s) DO NOT have a definite volume?
Gas.
500
What is the process of a gas changing directly into a solid called? Give one example.
Deposition. Frost on the grass when the temperature drops below degrees F. Remember stepping on frozen grass, and it makes a crunching sound?
500
Which state of matter has no fixed shape and may NOT fill a container completely?
Liquid