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physical science H
final exam part 2
| Question | Answer |
|---|---|
| synthesis? | Na+Cl----> NaCl |
| Decomposition? | NaCl---> Na + Cl |
| single displacement? | NaCl + Li---> LiCl + Na |
| Double Displacement? | NaCl + LiBr----> NaBr + LiCl |
| Exothermic reaction? | energy in released |
| Endothermic reaction? | energy is brought in |
| state the law of conservation of mass? | matter is neither created nor destroyed in a chemical reaction |
| How can the type of bond(ionic or covalent) determine the conductivity, boiling and melting point? | boiling point- higher in a ionic bond melting point- higher in a ionic bond conductivity- ionic is better |
| what affects how fast or slow substances dissolve? | stirring, pressure, surface area, temperature |
| Concentrated solution? | having a high volume of solute dissolved in a solvent |
| how does a concentrated solution affect the conductivity and melting point of that solution? | conductivity- increases, better conductor of electricity melting point- decreases |
| define solids? | definite shape and definite volume atoms are fixed close together |
| define liquids? | No definite shape but definite volume atoms are close together |
| define Gases? | No definite shape or no definite volume(fills space available) Atoms rarely together |
| change from solid to liquid? | it melts |
| change from liquid to gas? | it evaporates |
| what are polymers? | long chain of repeating monomers |
| how are proteins, carbohydrates and lipids important to our everyday lives? | proteins- build and repair tissue carbohydrates- gives energy lipids- store energy |
| define atom? | tiny particles |
| define molecule? | neutral particles formed as a result of electron sharing |
| define element? | if all the atoms in a sample are the same |
| define compound? | two or more elements that are chemically combined in a fixed ratio |
| what is a mixture | a material made up of two or more substances |
| what is a homogeneous mixture? | always evenly spread throughout(never settles) |
| what is a heterogeneous mixture? | unevenly spread throughout(trail mix) |
| how does a ionic bond form? | by loosing or gaining electrons |
| how does a covalent bond form? | by sharing electrons |
| Physical properties? | color, shape, size, odor, behavior |
| define physical change? | when you change the size, shape, etc. |
| define chemical change? | when one substance changes into another |
| Iron rusts, milk sours, food digested are? | chemical changes |
| ice melting, evaporation, sugar dissolves in water, and density are? | physical changes |
| define hydrocarbon | carbons just bonded with hydrogen's |
| compare and contrast longitudinal and transverse waves | both transfer energy and the direction of the medium is different |
| seismic waves | travel through ground |
| water waves | move through water |
| sound waves | travel through air |
| Electromagnetic waves | don't need a medium |
| the EM spectrum | velocity- constant frequency- increase to the right wavelength- decreases to the right energy increases to the right |
| concave lens | bend the light outward |
| convex lens | bring the light into a focal point |
| what wave characteristics allows us to see objects? | reflection |
| An echo is the ______ of sound waves. | reflection |
| the ability of waves to bend around objects is called________. | defraction |
| __________ is the bending of the wave by the change in density of the medium | refraction |
| the Doppler effect describes the following scenario: As a source of sound moves closer, the sound wave appears to... | increase in pitch |
| constructive interference | waves are added together |
| destructive interference | wave that cancel each other out |
| mechanical energy | energy created by the physical movement |
| electrical energy | when you plug something in outlet |
| chemical energy | food we eat |
Created by:
forvereme97
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