1
What is the fourth state of matter?
plasma
what is a unit of length in the metric system?
meters, cm, mm, km
what is a unit of volume?
liters, mL, kL
what units do we use to measure mass in the metric system?
grams
what unit(s) do we use to measure temperature in the metric system?
what is the control in the experiment?
the thing that you keep the same, to compare data to
what unit is used to measure energy in chemistry?
joules
matter changes form but not chemical identity
Provide an example of matter and an example of non-matter
non matter: gravity, time, sound
matter: table, pencil, floor
provide an example of a chemical change
a chemical reaction occurs and new products are formed
think of an example of condensation (going from a gas to a liquid)
steam from shower going onto the mirror
What is an example of a chemical property?
flammability, toxicity, reactivity, etc
what is the formula to find density?
D = mass/volume
true or false: liquids with a higher density will fall to the bottom
true
There are 20mL in a graduated cylinder, I add a wooden cube and the volume goes up to 27mL. What is the liquid volume of the wooden cube?
7mL
Solve for density:
A block of aluminum occupies a volume of 15.0 mL and weighs 40.5 g. What is its density?
2.7 g/mL
Explain how most elements were discovered/found
most elements were created from star explosions, cosmic ray fusions, the big bang etc
solve for density: a block of aluminum weighs 35.0g and occupies a volume of 12.0mL.
2.91 g/mL
what are 2 instruments we have used to measure mass?
digital scale, triple beam balance
what are all the steps to the scientific method?
experiment prompt: Lemon tree’s that receive more water will produce more lemons.
identity the independent variable, dependent variable and control
IV: water given
DV: amount of lemons produced
control: soil/water conditions
what is sublimation?
think of an example (hint: your reading(s) from when I was out)sublimation occurs when a substance goes from a solid to a gas without ever going into the liquid phase (ex. dry ice)
explain the difference between heat and temperature
explain what a phase change diagram shows
physical states of a substance under different conditions of temperature and pressure
solve for the following with this conversion factor. Convert 2.5m to cm
1m = 100cm
250cm