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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 |
Created by:
LuvJustinBiebs
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