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Mid-Year 8
| Question | Answer |
|---|---|
| How do we write what is happening in a chemical reaction? | Chemical equation |
| What is a physical change? Provide an example. | A change in a substance that does not change its identity (boiling water) |
| Is boiling point a physical property? | Yes |
| What is a chemical change? Example. | Change in which one or more substances combine or break apart to form new substances (rusted bike) |
| What is a pure substance? Example. | A single kind of matter that has a specific makeup and set of properties (oxygen) |
| What is an element? | A pure substance that cannot be broken down into other substances by chemical or physical means |
| Define weight. | Measure of the force of gravity on you. |
| Define mass. | Measurement of the amount of matter in the object. |
| Define density. Formula? | Mass of a material in a given volume. m/v |
| Solve for density: 100g of mass with a volume of 50cm3 | Density= 2cm3 |
| Define an atom. | The basic particle from which all elements are made. |
| Are atoms of different elements the same? | No |
| How would you find the volume of an irregular shaped object? | water displacement |
| What is used to measure the volume of a liquid? | Graduated cylinder |
| Define matter. | Anything that has mass and takes up space. |
| Mixture v.s. Compound | Mixture: made of at least 2 substances that are together but not chemically combined Compound: pure substance made of at least 2 elements chemically combined |
| Example of mixture | Soil |
| What can you predict from an element's location in the periodic table? | If it's a metal, metalloid or nonmetal and its properties |
| Describe metal elements. | Hard, good conductor of heat |
| Which group of elements contains the most elements? | Metals |
| More than half of the nonmetals at room temperature are what state of matter? | Gas |
| Define ductile. | Drawn into a wire |
| The number of protons as equals the number of what? | electrons |
| Define atomic number. | number of protons in an atom |
| Which particle of an atom is outside of the nucleus? | Electon |
| Define metalloids. | Semiconductors (in between metals and nonmetals) |
| Define a solid, liquid, and gas. | Solid: definite shape and volume Liquid: definite volume, no definite shape Gas: no definite shape or volume |
| Define Charles's Law. | A principle that describes the relationship between temperature and volume of a gas at a constant pressure |
| Define sublimation. | change in a state from solid directly to gas |
| Define surface tension. | the result of an inward pulling among the molecules of a liquid that brings the molecules closer together; causes the surface to act as if it has thin skin |
| What is it called when a substance changes from a liquid to a solid? | Freezing |
| The freezing point of water is the same as its_____ point. | Melting |
| Define vaporization. | Change in state from a liquid to gas. |
| Define condensation. | Change in state from gas to liquid |
| The opposite of vaporization is what? | Condensation |
| Define a fluid. | Any substance that can flow |
| The amount of space an object takes up is called its what? | Mass |
Created by:
jazzyylyy
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