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Midterm Study Guide
| Question | Answer |
|---|---|
| What is the density of a substance with a mass of 52 grams and a volume of 16 mL (density = mass/volume)? | 3.25 |
| The number of protons in the nucleus of an atom | Atomic number |
| What are the parts of an atom? | Nucleus-protons (positive) + neutrons (neutral) Electrons (negative) move around the nucleus |
| Be able to count the number of atoms of each element Ex: How many atoms of Magnesium are in the compound: MgBr2 | There is 1 atom of Magnesium |
| An atom of the same element with the same number of protons but different number of neutrons | isotope |
| What happens when atoms gain electrons? What happens when they lose them? | Gain-become negative ions Lose-become positive ions |
| How are atoms arranged in solids, liquids, and gases? | Solids-tightly packed Liquids-close together but able to move Gases-far apart |
| Process by which a gas turns into a liquid | Condensation |
| Matter phase change from solid directly to gas | Sublimation |
| Process by which matter changes from a liquid to a gas | Evaporation |
| Temperature at which matter changes from a solid to a liquid | Melting point |
| Temperature at which matter changes from a liquid to a solid | Freezing point |
| Made up of one uniform component | Homogeneous (coffee, tea, lemonade) |
| Made up of to or more distinct components | Heterogeneous (Chex mix, pizza, sand/gravel) |
| What happens when a substance loses heat energy? What happens when a substance gains heat energy? | Loses-temperature decreases Gains-temperature increases |
| What color does litmus paper turn with acids? What color does it turn with bases? | Acids-red Bases-blue |
| A reaction that absorbs heat from the area | Endothermic-feels cold |
| A chemical reaction that gives off heat energy | Exothermic-feels hot |
| What are the signs of a chemical change? | Formation of bubbles, light produced, color change, smell change, change in temperature |
| A change only in appearance of matter | Physical change (ice melting, cutting paper) |
| A process that changes substances into new substances | Chemical change (burning wood, digesting food, iron rusting) |
| What factors increase reaction rate? | temperature, surface area, concentration |
| What is on the left side of a chemical equation? | Reactants |
| What is on the right side of a chemical equation? | Products |
Created by:
raymie.sonnier
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