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ClassifyingMatter
Mrs. Brandt's 8th Grade Science
| Question | Answer |
|---|---|
| What is the study of energy and its effects on matter? | physics |
| What is a change in a substance’s size, shape, or state of matter? Its identity does NOT change. | physical change |
| What is the study of matter and how it changes due to energy? | chemistry |
| What is it when a substance can change from one thing to another like in combustion or corrosion? | chemical property |
| What is it when a material can be observed without changing the identity of the material like shape or state of matter? | physical property |
| When one substance has changed into a completely new substance, what has occurred? | chemical change |
| What is anything that has mass and takes up space? | matter |
| What states that the mass of all substances before a chemical change equals the mass of all of the substances after the chemical change? | Law of Conservation of Mass |
| What process is used in the lab to separate a dissolved solid from a liquid, like salt from water? | evaporation |
| What is a heterogeneous mixture made of large particles that never settle out and will scatter light shined through it? | colloid |
| What is a heterogeneous mixture containing a liquid in which visible particles are settled out? | suspension |
| What substance has atoms that are all the same? | element |
| What is a pure substance in which two or more elements are combined in a fixed proportion? | compound |
| What is a mixture of two or more gas, liquid, or solid substances blended evenly throughout so that it looks like it is just one thing? | homogeneous |
| What is a mixture in which different materials can easily be seen? | heterogeneous |
| Name 3 elements. | copper, oxygen, gold, |
| Name 2 compounds. | calcium carbonate (CaCO3), sodium chloride (NaCl) |
| Name 2 suspensions. | pond water, jar of mud water |
| Name 2 solutions. | tea, salt water |
| Name 2 colloids. | fog, milk |
| Name 3 physical changes. | grinding salt in a salt grinder, ice cube melting, luster (shine) |
| Name 4 chemical changes. | rusting nail, burning leaves, yogurt turning sour, water split into its two parts- hydrogen and oxygen. |
| Is salt water homogeneous or heterogeneous? | homogeneous |
| Is a pie homogeneous or heterogeneous? | heterogeneous |
| Is an unopened bottle of lemonade homogeneous or heterogeneous? | homogeneous |
| Is a piece of granite homogeneous or heterogeneous? | heterogeneous |
| The shape of a piece of fruit is what kind of property? | physical property |
| When a log is burned in a fire, what is created? | ash is formed so a new substance is created |
| What is another name for a homogeneous mixture? | solution |
| What results when two or more substances are combined so each substance can be separated by physical means? | mixture |
| A colloid, a suspension, and a solution are examples of what? | mixture |
| What is the scattering of light by colloids called? | The Tyndall Effect |
| List 3 examples of physical changes. | -boiling water -tearing a piece of paper -bursting of a balloon |
| Explain how to separate a mixture of sand and sugar. | First, dissolve the mixture of sand and sugar in water. Second, filter the water through a piece of filter paper and separate the sand and sugar water. Thirdly, evaporate the sugar water to separate the sugar from the water. |
| What are 6 examples of physical properties? | -red in color -shines when polished -liquid at room temperature -density -texture -odor |
| A homemade dressing is made of vinegar, oil, and spices. Is it a colloid, a solution, or a suspension after shaking it? How do you know? | 36. It is a suspension because after being shaken and then having time to sit undisturbed, it will settle out again. |
| Explain the test that determines if there is hydrogen gas in the air. | burning splint test there will be a pop or barks if there is hydrogen present |
| Explain the test that determines if there is oxygen gas in the air. | glowing splint test flames will develop if there is oxygen present |
| Explain the test that determines if there is carbon dioxide gas in the air. | burning splint test the flame on the splint will be smothered if there is carbon dioxide present |
| Explain how you know that something has undergone a physical change. | There has been a physical change if a substance’s size, shape, or state of matter has changed. |
| Explain how you know that something has undergone a chemical change. | There has been a chemical change if a substance changes to another substance. |
| chalk | compound |
| copper | element |
| granite | heterogeneous |
| vinegar | homogeneous mixture |
| pond | suspension |
| water | compound |
| salt | compound |
| soft drink | homogeneous mixture |
| paint | colloid |
| gold | element |
| river delta | suspension |
| fog | colloid |
| gelatin | colloid |
| lead | element |
| What are all substances built from? | atoms |
| A beam of light can be seen as it passes through what? | colloid |
| Look through your notes and review how to complete Conservation of Mass problems. | Remember that the amount you start with is the amount you will end with. |
Created by:
mtoutant
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