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Unit 2 Lesson 1-Scie
Changes of State, Matter, Chemical & Chemical Reations
| Question | Answer |
|---|---|
| Altering the form or organization of an object without changing the type of matter within it is called a (an)__________. | physical change |
| The 3 states of matter are________,________,and _________. | solid, liquid, gas |
| The state of matter of an object is a(n) ________ property. | physical |
| The average movement of molecules in an object is measured by ____________________. | temperature |
| When a solid gains heat energy, its molecules begin vibrating too quickly to stay together, so the solid becomes a(n) _________. | liquid |
| When gases loose heat, they _____________ into liquid. | condense |
| A liquid loses heat and ____________ into a solid. | freezes |
| When a solid changes directly into a gas, it is ____________. | sublimation |
| Energy from __________ can cause the different forms of water on Earth to change state in the water cycle. | the sun |
| When a substance melts or boils, it absorbs _____________. | heat energy |
| The temperature at which a substance changes from a solid to a liquid is its ____________________. | melting point |
| The temperature at which a substance boils is its _________. | boiling point |
| The temperature at which a substance changes from a liquid to a solid is its __________________. | freezing point |
| Nonmetals' particles are weakly attracted to one another, so they have _______ melting and boiling points. | low |
| The slow change from a liquid to a gas at temperatures below the boiling point is called _____________________. | evaporation |
| Usually, particles of matter draw ___________________ as they loose heat. | closer/tightly |
| Water molecules move _______________ apart just before freezing. | further apart |
| A color change on metal that is caused by a chemical change is called ______________. | tarnish |
| Bubbles form when baking soda and vinegar are mixed, indicating that a _____________________has taken place. | chemical change |
| A solid that forms when 2 solutions are mixed is called a(an) ________________. | precipitate |
| If a chemical reaction produces heat and light, then reversing the reaction should _________________. | absorb energy |
| Plants use a chemical reaction called ________________. | photosynthesis |
| Plants and animals use a chemical reaction called _______________ to burn sugars for energy. | respiration |
| Photosynthesis is a chemical reaction that provides living things with food and ______________. | oxygen |
| A combination of 2 or more elements is called a(an) ___________. | compound |
| A compound has different properties than do the ________________ that formed it. | individual elements |
| Rust is a combination of iron and _______________. | oxygen |
| The chemical name for rust is ______________. | ironoxide |
| The chemical formula for rust is ____________. | Fe2O3 |
| Changing one substance into another is ______________. | chemical change |
| When atoms break their old links and form new links with other atoms, a(n) _____________has occurred. | chemical reaction |
| Chemist keep track of substances are used and created in a chemical reaction by writing ___________________. | chemical equations |
| Chemicals on the left side of a chemical equation are called ___________. | reactants |
| Chemicals on the right side of a chemical equation are called ____________. | products |
| IN every chemical reaction, the total mass of the reactants always equals the total mass of the products. This fact is know as the ____________________________________________. | law of conservation of mass |
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