Term
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Definition
| The substances that make up the universe. |
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Term
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Definition
| Characteristics that describe matter. |
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| What are some examples of properties of matter? |
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Definition
| mass, weight, volume, density, texture, color, shape, height, width, temperature, odor, taste, etc. |
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Term
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Definition
| A measure of the amount of matter in a substance |
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Term
| What is mass measured in? |
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Definition
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Term
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Definition
| The amount of gravity acting on an object. |
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Definition
| The amount of space matter takes up. |
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Term
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Definition
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Term
| Two ways to figure out volume |
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Definition
| Use a formula or use the displacement of water |
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Term
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Definition
| How tightly packed together the molecules in a substance are. |
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Term
| Formula for calculating denisty |
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Definition
| mass divided by volume (g/ml) |
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Term
| What does density have to do with convection? |
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Definition
| When air is warmed, it becomes less dense and rises. When air is cooled, it becomes denser and sinks. This circulation of air is convection. |
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Term
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Definition
| an object’s ability to float |
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Term
| What determines an object’s buoyancy? |
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Definition
| Objects that are denser than water sink and objects that are less dense than water float. |
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Term
| Why is energy not considered matter? |
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Definition
| Energy does not have mass or volume, and all matter has mass and volume. |
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Term
| What is a physical change? |
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Definition
| A physical change occurs when a substance changes form, but not composition. |
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Term
| What are some examples of physical changes |
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Definition
| boiling, freezing, melting, smashing, crumpling, twisting, etc. |
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Term
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Definition
| when a substance changes from one chemical composition to another |
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Term
| signs that a chemical change has taken place |
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Definition
| a change in temperature, a change in color, a flash of light, and formation of a gas |
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Term
| Another name for chemical change |
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Definition
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Term
| the three main phases of matter |
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Definition
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Term
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Definition
| molecules tightly bound together in an orderly fashion, barely moving |
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Term
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Definition
| molecules moving around, still fairly close, but unordered |
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Term
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Definition
| molecules moving around quickly and far apart |
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Term
| What does adding heat to a substance do? |
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Definition
| It causes the molecules to slow down and move closer together. |
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Term
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Definition
| temperature when a liquid becomes a solid |
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Term
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Definition
| the temperature where a solid becomes a liquid |
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Term
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Definition
| the temperature where a liquid becomes a gas |
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
| Make sure you study that Phase Change Diagram |
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Definition
| There will be ten points on your quiz about that diagram. |
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Term
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Definition
| Evaporation is the process of liquid changing to gas |
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Term
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Definition
| Condensation is the process of gas changing to liquid. |
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Term
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Definition
| Precipitation occurs after the liquid produced in condensation becomes heavy enough to fall to Earth. |
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Term
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Definition
| Pure substances that do not contain anything else and cannot be broken down |
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Term
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Definition
| A of all of the elements. It is arranged vertically into columns called groups and horizontally into rows called periods |
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Term
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Definition
| A mixture is a loose combination of substances. |
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Term
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Definition
| A solution is when two or more substances combine and one dissolves the other. |
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Term
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Definition
| salt water, sugar water, coffee |
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Term
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Definition
| A chemical combination of two or more elements |
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Term
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Definition
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Term
| What kind of change creates a compound and how do we know? |
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Definition
| Chemical change because it is nearly impossible to get the original substances back |
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Term
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Definition
| An atom is the smallest portion into which an element can be divided and still retain its properties. |
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Term
| three main parts of an atom |
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Definition
| electrons, protons, and neutrons |
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Term
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Definition
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Term
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Definition
| A chemical bond holds the atoms of a molecule together |
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Term
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Definition
| NH3 is ammonia. It means one nitrogen atom has been chemically bonded to three hydrogen atoms |
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Term
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Definition
| H2O is water. It means that two hydrogen atoms have been chemically bonded to an oxygen atom. |
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Term
| What kind of change occurs when a solution is created? |
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Definition
| It is still fairly easy to separate out the original substances, so it is a physical change |
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Term
| What kind of change occurs when you create a mixture? |
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Definition
| It is a physical change because it is easy to separate out the original substances. |
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