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Midterm Study Guide

QuestionAnswer
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