Density
A rock has a mass of 40g and a volume of 15mL. What is the density?
2.67g/mL
A mass of 0.15 ounces is equal to how many grams? *1 ounce = 28.35 g*
4.25g
1 km> m
1000m
Quantity
number + unit
Example of a homogeneous mixture
milk, salt water, jell-o, sweet tea, coffee
You want to move a boulder with a mass of 3500g and a volume of 275mL. What is the density?
12.73g/mL
2.00 gallons is equal to how many liters? *4 quarts = 1 gallon; 1 quart = 0.9463 L*
7.57L
5000g>kg
5kg
SI
International System of Units
Example of a heterogeneous mixture
pizza, burgers, skittles, m&m's, jelly beans
Imagine you have a brick with a mass of 1500g with a density of 3.4g/cm3. What is the volume?
441.18cm3
An African forest elephant weighs 3 tons. What is his weight in grams? *2000lbs = 1ton; 454g= 1lb*
2724000g
12.2L> cL
1220cL
An Element
any element from the periodic table
Example of a compound.
C6H12O6, NaCl, Fe2O3
A ball with a mass of 345g has a density of 1.5g/mL. What is the volume?
230mL
A beaker contains 578 mL of water. What is the volume in quarts? *1 qt = 0.946 L*
.611qts
1202.200mL>cL
120.22cL
How does an independent variable relate to an dependent variable?
The dependent variable reacts to (depends on) the independent variable.
How does a mixture compare to a compound?
Compounds are made up of elements and can only be separated through chemical means; Mixtures can be separated through physical means.
Rocks are sometimes used along coasts to prevent erosion. If a rock needs a mass of 2,000 kilograms (about 2 tons) in order not to be shifted by waves, how big (what volume) does it need to be? You are using basalt, which has a typical density of 3200 kg/m3 .
.625m3
If you are going 55 mph, what is your speed in mm per second? *1 inch = 2.54 cm; 5280ft = 1mile*
24586.2mm/s
340000.9000mm > km
.3400009km
What are the steps to the scientific method?
Observe
Hypothesize
Experiment
Analyze
Draw Conclusions
What is the difference between a colloid and a suspension?
particle size, suspensions settle (shake well before using)