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SC Test 234
Science test study for chapters 2, 3, and 4
| Question | Answer |
|---|---|
| a sample of matter, either a single element of a single compound, that has definite chemical and physical properties | pure substance |
| a homogeneous mixture throughout which two or more substances are uniformly dispersed | solution |
| the amount of a particular substance in a given quantity of a mixture, solution, or ore | concentration |
| a mixture in which particles of a material are more or less evenly dispersed throughout a liquid or gas | suspension |
| a mixture consisting of tiny particles that are intermediate in size between those solutions and those in suspensions and are suspended in a liquid, solid, or gas | colloids |
| solid with orderly three D rows and give three examples | crystalline: iron, diamond, ice |
| solids with no special arrangement an give three examples | amorphous: glass, rubber, wax |
| the amount of force exerted on a given area | pressure |
| another way to think of gas pressure | number of times particle of gas hits inside of container |
| greater pressure=volume decreases by same amount. inversely related. | Boyle's Law |
| increased temp=increased volume of gas. same way. | Charles's Law |
| what happens when energy is added to a solid | increased temperature, particles move faster, will reach melting point |
| the temperature where a liquid changes into a solid | freezing point |
| can evaporation occur in a liquid below its boiling point? | yes, but only at the surface |
| temperature where liquid changes to gas in pressure on bubbles | boiling point |
| temperature where gas becomes liquid | condensation point |
| when a solid changes directly into a gas | sublimation |
| when substances lose/gain energy, what changes? | temperature or state |
| how can a compound be broken? | using a chemical change, such as heat or electrolysis |
| what is electrolysis? | application of electric current to break down compounds |
| what are some proteins found in nature? | protein, CO2, carbohydrates |
| what is needed for a compound to form? | a specific ratio according to their masses |
| how can mixtures be separated? | physical changes |
| true or false: components of a mixture do not need to be mixed in a definite ratio | true |
| in two liquids or gases in a solution, which is the solvent? | the substance present in the largest amount |
| solid solutions of metal or nonmetals dissolved in metals; give two examples | alloys; steel, brass |
| particles in solutions cannot be removed by ____, and will not settle out. | filtering |
| most ___ are soluble in liquids as temperature is raised | solids |
| ___ become less soluble as temperature is raised | gases |
| three ways to dissolve solute | heating, mixing, crushing |
| ______ can be separated by passing through a filter | suspensions |
| three examples of colloids | milk, mayo, stick deodarant |
| colloids cannot be separated using ______ | filtration |
| equation to find concentration | grams of solute/mL of solvent |
| equation for density | D=m/V |
Created by:
Tsarmina
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