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Chemistry Unit Test
Question | Answer |
---|---|
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 |