Test Review for Matter, SI units, Conversions, and Sig Figs
MATTERIn the first two weeks we went over properties of matter, changes of matter, and how we can
use them to identify substances and if reactions have occurred.
The topics that will be addressed in the test are:
1. Knowing what physical properties are, ex. density, boiling point, freezing point, melting point,
color, smell.
2. Knowing chemical properties are the properties that allow the substance to react with others.
3. Types of matter: mixtures- heterogenous and homogeneous
Pure substance- compound, element
4. Physical changes are changes that do not change the properties of a substance; the state of
matter ( melting, boiling, sublimation, freezing), changing shape or size.
5. Chemical changes are when a substances rearranges or changes its components to become a
different substance; burning of wood or fossil fuels, rusting of metal, reacting a metal with an
acid.
SI Units –
We have been using and learning about SI and metric units you will need to have the following
memorized and be able to use during the test to answer questions.
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SI units and metric units have base units: ex. meter, gram, liter, second
These units use prefixes to signify in a change in the power 10: ex. Kilo (1000 times base unit),
centi (1/100 of the base unit)
The prefixes you must have readily known and available to use are
o Kilo, deci, centi, mili, micro, and nano
You need to know there equivalence to the base unit and there abbreviation.
ConversionsConversions are used to convert one unit into another without changing the amount being used. An
example would be converting 24 eggs to 2 dozen eggs, both represent the same amount of eggs, just
with a different unit. Please reference you worksheets, quiz and the following Khan academy links
below for help or review before the test.
https://www.khanacademy.org/math/arithmetic/rates-and-ratios/metric-system-tutorial/v/unitconversion
Significant FiguresWe use significant figures when ever we have measurements. We use them to signify are inaccuracy
in our measurements. All measurements are inaccurate to some degree. The rules to significant
figures are on the power point on my web site http://www.nthurston.k12.wa.us/Page/13276 .
Some rules to multiplication/division and addition/subtraction:
Remember do not round till the end of an equation.
Multiplication and division- You always need to use the number of significant figures in you answer as
the measurement with the least amount of sig figs.
Ex.
54.00 x 1.0 = 54
3sf 2sf 2sf
When subtracting or adding you need to use the number in the equation that has the fewest decimal
places.
Ex.
2.456
-132.3___
-130.2
Links on Sig Figs
https://www.khanacademy.org/math/arithmetic/decimals/significant_figures_tutorial/v/significantfigures