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Chemistry 1 Test
| Question | Answer |
|---|---|
| physical change | They don't change the composition of a substance, only the physical properties. |
| change in state of matter | When a substance changes from one state of matter to another. |
| Is ice-cream melting a physical change or chemical change? | Ice-cream melting is a physical change because the composition stays the same. |
| When a substance changes directly from a gas to a solid, or from solid to gas, it is called ________. | Sublimation |
| Is sublimation a physical change or a chemical change? | Sublimation is still a physical change because the composition of the substance remains the same. |
| How many kinds of physical changes are there? | There are 2 kinds of physical changes. Change in size or shape, and change in state of matter. |
| change in size or shape | When a substance changes in size or shape. |
| What kind of physical change is shredding paper? | Change in size or shape. |
| What kind of physical change is stretching a rubber band? | Change in size or shape. |
| Chemical Change | The result in the formation of one or more new substance with new chemical and physical properties. |
| Color change | When a substance changes color, the chemical composition of the substance may have changed. |
| Temperature change | When a substance is combined with another substance, there may be an increase or decrease in temperature. |
| Formation of a precipitate | When two solutions are combined, they may form a solid substance. This solid substance is called a precipitate and indicates that a chemical change has occurred. |
| Atom | The smallest part of an element. |
| Protons | particles that are found in the nucleus of an atom. They are positively charged particles. |
| Neutrons | Particles that have no charge. They are found in the nucleus of an atom. |
| Electrons | They are negatively charged particles that orbit the nucleus. |
| Democritus Influence to Atomic Theory | He theorized that if you cut a paper into pieces you would eventually get to a particle that you can't cut physically. |
| Dalton's Influence to Atomic Theory | Theorized that atoms were too small to be seen by the human eye. He proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass. |
| Thompson 's Influence to Atomic Theory | Used a cathode ray to detect electrons and theorized that electrons are embedded in the nucleus/nuclei of an atom. |
| Rutherford's Influence to Atomic Theory | Used a gold foil experiment involving alpha particles; theorized atoms had a dense core which was a positive nucleus |
| Bohr's Influence to Atomic Theory | Theorized electrons were orbiting the nucleus (also had the most accurate model) |
| Compounds | Pure substance composed of two or more different elements joined by chemical bonds. Also they can only by separated by chemical means. |
| Mixtures | A combination of two or more pure substances that are not chemically combined. |
| Homogeneous Mixtures | You can't see all of the parts like pancakes. |
| Heterogeneous Mixtures | You can see all of the parts like pizza, and salad. |
| Elements | They are pure substances that can't be separated into simpler substances Physical or Chemical means. |
| Melting point | It is the point where the solid melting into a liquid. |
| Boiling Point | It is the point where the liquid goes into a gas. |
| Density | Density is a property that describes their relationship between the mass of a material and its volume. |
Created by:
zapak
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