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Mid-Term Study Guide

QuestionAnswer
What formula do you calculate density? density= mass / volume
What is the density of a substance whose mass is 52 grams and whose volume is 16 mL? 3.25 mL
What is the definition of atomic number? The number of protons in the nucleus of an atom, atomic number determines the chemical properties of the atom
How are elements arranged on the periodic table? By increasing atomic numbers
What is inside of the nucleus? Nucleus= protons (positive) + neutrons (neutral)
What is the atomic mass? Atomic mass is the number of protons plus neutrons
What is the charge of the electron and what does it do inside of the nucleus? Electrons (negative) move around the nucleus
How many atoms of Magnesium are in the compound: Mgbr2? 2
What are periods on the periodic table called? Rows
What are groups on the periodic table called? Columns
Is Carbon a nonmetal , metal , or metalloid ? Nonmetal
What does Magnesium , Potassium , and Sodium have in common? They are all metals.
What is the definition of an isotope? Each of two or more forms of the same element that contain equal numbers of neutrons in their nuclei
What happens when an atom gains electrons? Becomes a negative ion
What happens when an atom loses electrons? Becomes a positive ion
How are solids arranged? Tightly packed
How are liquids arranged? Close together but able to move
How are gasses arranged? Far apart
What is the definition of condensation? The conversion of a vapor or gas to liquid
What is the definition of sublimation? The transition of a substance directly from the solid to the gas phase without passing through the liquid phase
What is the definition of evaporation? The process of a substance in a liquid state changing to a gas state
What is the definition of melting point? The temperature at which a given solid will melt
Created by: jalynndavis