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chemistry quiz
| Question | Answer |
|---|---|
| what is a mixture | a mixture contains 2 or more substances that are physically combined and can be physically separated |
| what are some methods of separating mixtures | distillation, filteration, and chromatography |
| what are the 2 types of mixtures | homogeneous and heterogeneous |
| what is a homogeneous mixture | a combination of substances that are evenly distributed throughout, resulting in a uniform composition where the individual components cannot be seen |
| what are heterogeneous mixtures | A heterogeneous mixture is a mixture that has a non-uniform composition, meaning its components are not evenly distributed and can often be seen as distinct parts. |
| what are the 3 states of matter | solid ,liquid and gas |
| what are the 2 types of phase changes | physical and chemical change |
| what is a phase change | it changes physically not chemically like water freezing its still the same chemically |
| what is the name of gas to solid | deposition |
| what is the name of solid to gas | sublimation |
| what is the name of solid to liquid | melting |
| what is the name of liquid to solid | freezing |
| what is the name of liquid to gas | vaporization/boiling |
| what is the name of gas to liquid | condensation |
| what is matter defined as | anything that has mass and takes up space |
| what is it called when 2 different elements are combined | compound |
| what phase changes are exothermic | freezing, condensation, deposition |
| what phase changes are endothermic | Melting, vaporization, sublimation |
| what does lower and higher temperature mean when talking about kinetic energy | the lower the temp the lower the kinetic energy the higher the temp the higher the kinetic energy |
| what does potential energy do when enegy leaves during a phase change or gains energy | when a phase change occurs and energy id gained so is potential energy same with when energy is realesed |
| What’s the difference between a physical property and a chemical property? | Physical can be observed without changing identity; chemical describes how a substance reacts or changes. |
| What is kinetic energy? | Energy of motion. |
| What does the law of conservation of matter state? | Matter cannot be created or destroyed, only rearranged. |
| Why are changes of state and dissolving physical changes? | Because they don’t change the identity of the substance. |
| What are pure substances | Substances with a fixed composition — elements or compounds. |
| How do you distinguish between elements, compounds, and mixtures? | Elements = one type of atom, compounds = chemically bonded atoms, mixtures = physically combined. |
| What are some typical separation techniques? | Filtration, distillation, magnetism, chromatography. |
| What is energy? | The ability to do work or cause change. |
| What is the SI unit for energy? | The joule (J). |
| What is potential energy? | Stored energy due to position or composition (in chemical bonds). |
| What is the law of conservation of energy? | Energy cannot be created or destroyed, only transformed. |
| What is the difference between endothermic and exothermic? | Endothermic absorbs heat; exothermic releases heat. |
| What’s the difference between heat and temperature? | Heat = total energy transfer; temperature = average kinetic energy. |
| What direction does heat flow? | from warmer to cooler objects |
| What happens to kinetic and potential energy during phase changes? | Kinetic energy stays constant, potential energy changes. |
| What is a heating or cooling curve? | A graph showing temperature changes as a substance is heated or cooled through phase changes |
Created by:
Fernando.Quezada