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Unit 3 Test Study Guide

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  • Give at least 2 ways the periodic table is organized
    Rows called Periods; Columns called Groups; Increasing atomic number; Valence Electrons
  • Describe what happens during the following phase changes: Condensation and Evaporation
    Condensation - Gas to Liquid; Evaporation - Liquid to Gas
  • What is the difference between a molecule and a compound?
    A compound has to be 2 or more DIFFERENT elements chemically bonded together
  • What is Nitrogens atomic number? Atomic mass?
    Atomic Number = 7; Atomic Mass = 14
  • How many Hydrogen atoms are on the reactant side? How many Hydrogen atoms are on the product side?
    Reactant Side H = 16; Product Side H = 12
  • State of matter that has a definite volume but not a definite shape is known as what?
    Liquid
  • List 3 examples of electromagnetic energy
    Light, microwaves, radio waves, x-rays, gamma rays
  • Using the example of salt water, describe what a solution, solute and solvent are.
    Solution - mixture that appears to be a single substance (salt water); Solute - what gets dissolved (salt); Solvent - substance that dissolves the solute (water
  • What is the coefficient for water (how many water molecules are there)?
    6
  • What are 2 examples of radiation?
    The warm sun melting a snowman and Feeling the warmth from a fire
  • What is the term used for the left side of a chemical equation? Right Side?
    Reactants and Products
  • What are 2 examples of conduction?
    Sitting down on a hot seat of your car and A pot sitting on a hot burner
  • What are 2 examples of convection?
    Water boiling on a stove and Air currents
  • Metal Rusting, Digesting food, Fireworks, and roasting marshmallows are examples of what type of change?
    Chemical Change
  • Describe the energy transformations that takes place when you use a dishwasher
    Electrical -> Mechanical -> Thermal + Sound + Electromagnetic (Light on dishwasher)
  • Folding paper, breaking glass, melting ice cream, and chewing food are all examples of what type of change?
    Physical Change
  • Describe the difference between a heterogenous and homogenous mixture? Give one example for each.
    Heterogenous - particles are not evenly spread out - Ex. Pasta Salad; Homogenous - particles are evenly spread out - Ex. Air
  • How many Protons, Neutrons, and Electrons does Lithium have?
    Protons = 3; Neutrons = 4; Electrons = 3
  • Describe what happens in a convection current?
    Warm less dense fluid rises, while cooler more dense fluid sinks
  • Describe or Draw a Bohr Model for Fluorine - Found in Period 2
    Should have 9 protons and 10 Neutrons in the Nucleus; 2 electrons in shell 1 and 7 electrons in shell 2
  • Describe the energy transformation that takes place when you set off a firework
    Chemical -> Electromagnetic -> Thermal + Sound
  • NaCl (Sodium Chloride or Salt) is an example of what?
    Compound
  • Give an example of Chemical Energy? Nuclear Energy?
    Chemical - batteries, food, fuel; Nuclear - Fusion (sun) Fission (Power Plants)
  • What are the two subatomic particles found in the nucleus of an atom and what are their charges?
    Protons - Positive; Neutrons - Neutral (No Charge)
  • Describe the Law of Conservation of Mass and how is it similar to the Law of Conservation of Energy
    Both state that these cannot be created or destroyed they can only change forms
  • What determines the number of shells in a Bohr Model of an atom?
    The period (row) of the element; For example, Hydrogen would have 1 shell
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