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Chemistry Unit Test

QuestionAnswer
Homogeneous mixtures are also known as... Solutions
The definition of matter says that it must occupy space. What is the other requirement? mass
What kind of change occurs when iron is melted? physical
Heterozygous means.. same
homozygous means different
Volume equation? V=LxWxH
Scientific notation for 2500? 2.5 x 10^3
Whats giga's (G) prefix? 10^9
Mega (M)? 10^6
Kilo (K) 10^3
Deci (d)? 10^-1
Centi(c)? 10^-2
Milli (m) 10^-3
Density is.. mass/volume or D=M/V Density also is .. grams/cubic cm or g/cm^3 or g/mL
Equation for % error? difference/ accepted value x100
Significant Figures or sig figs All digits 1-9 are significant, certain 0's are place holders
When adding sig figs you. Find the smallest number and however many places come after that smallest number is how many you use in your answer.
When multiplying sig figs you.. You count the total number of sig figs and your answer can only have that of the smallest number.
What are the four states of matter? Solid, Liquid, Gas, and Plasma
What is the "Law Conversion of Mass"? matter is neither created nor destroyed in a chemical reaction.
What are elements? They are made of only one type of atom, can't be broken down, and 90% of the elements occur naturally on earth.
Compounds Pure and are made when atoms bond together, or two or more elements are chemically added together.
Base Units are? Units of measure based on objects in the physical world.
Heterogeneous Matter -Poorly mixed, clumpy -CAN be separated
Homogeneous Matter -Formed from two or more compounds. -Mixed together well -Appears the same everywhere
Solutions occur when A solute gets added to a solvent. ex. Kool-Aid
Derived Unit A unit of measure that is based on a combination of base units.
Distilled water is an example of what? A compound
4 clues that a chemical change has occurred are? -New Color -New Odor -Bubbling -A precipitate
what is a precipitate? a solid appears cloudy.
Endothermic Absorbs heat (cold)
Exothermic Releases heat (hot)
Physical Properties Easily identifiable things like: color, density, smell, hardness.
A symbol for volume could be: mL
Created by: LuvJustinBiebs