Significant figures
Number of significant figures in 0.0000000032
2
Micro means ...
10-6
matter
Anything that occupies space and has mass
What is a hypothesis?
a tentative interpretation or explanation of an observation
What are the properties of solids?
fixed shape and fixed volume
atoms may vibrate but don't move
incompressible
Round 653.58612 to four significant figures
653.6
12 g = ? mg
1.2 *104 mg
law
brief statement that summarizes a scientific phenomenon
What is the dependent variable in this scenario:
The time it takes to run a mile depends on the person’s running speed.
time
How is matter classified according to its composition?
pure substances (elements and compounds)
mixtures (homogenous and heterogenous)
Perform the calculation to the correct number of significant figures:
1.625 + 78.2=
79.8
3 nm = ? m
3*10-9 m
law of conservation of mass
in a chemical reaction matter is neither created nor destroyed
What is the independent variable in the scenario: Lemon trees receiving the most water produced the most lemons.
amount of water given to the lemon trees
Find the density of a sample of liquid that has a volume of 22.5 mL and a mass of 27.2 g.
Remember: sig. figs. and unit!
1.21 g/mL
Perform the calculation to the correct number of significant figures.
2.55 * 45.768=
117
1 km = 0.6214 mi
2.5 km = ? mi
1.5535 mi
kinetic energy
form of energy associated with motion
State 4 lab safety rules
answers vary
What do the following prefixes mean: nano, milli, centi, kilo?
nano 10-9
milli 10-3
centi 10-2
kilo 103
Perform the calculation to the correct number of significant figures:
(5.8 + 12.36) / 1.2=
15
1 in = 2.54 cm
15.6 in = ? m
0.396 m
endothermic reaction
Chemical reaction that absorbs energy from its surrounding
State 6 lab safety rules
answers vary
56 lb = ? mg
1lb= 453.59 g
2.5401*107 mg