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Misc.
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Exo- / Endo-
Balancing Equations
Atoms
100
What is the equation to solve for Density?
Density = mass/volume (remember: "Density loves you!")
100
Compare and Contrast a scientific law and a scientific theory
scientific law = what happens scientific theory = why it happens (remember 3 things a theory has to do/be) both hold equal strength
100
What do the prefixes "exo-" and "endo-" mean?
exo- outside endo - inside
100
What does a subscript look like and what does it mean for the atom?
a small number set slightly below the symbol; tells how many of that atom are included in the compound
100
Define a Molecule
a group of atoms, chemically combined
200
Define a diatom
the atom of an element that is too unstable to be left alone
200
Define and Provide an example of a physical change
Only changes form (what it looks like) Answer will vary
200
Which reaction type feels warm to the touch? Why is that?
Exothermic; There is extra energy from the reaction that needs to be released into the environment
200
What is a coefficient and when is it used?
large number in front of an element or compound; used to balance equations
200
What is the relationship between an Atom and a Molecule?
Molecules are made-up of atoms
300
List all the Diatoms
Hydrogen, Iodine, Bromine, Oxygen, Nitrogen, Chlorine, Florine
300
Changing from one state of matter to the next is an example of what type of change? Explain
physical change; it is still the same substance, just in a different form
300
Define 'activation energy'.
the minimum amount of energy needed to start specific a chemical reaction
300
Identify the four types of chemical equations
synthesis, decomposition, single replacement, double replacement
300
How are Molecules held together?
Chemical Bonds
400
How is the Law of Conservation of Mass related to balancing an equation?
Law says, matter can't be created or destroyed therefore all the matter you had on one side has to equal the amount of matter you have on the other side
400
Contrast an inhibitor and a catalyst.
inhibitor = slows rxn catalysts = lowers activation energy = faster rxn
400
Draw and label an exothermic graph
check notes for answer
400
Contrast reactants and products
reactants are the substances you begin a chemical reaction with (on the left), products are the substances you're left with after the reaction (on the right)
400
Define a Characteristic Property and give an example of one
Something that is true for all samples of a substance and never changes, and answers will vary
500
Identify the various measures that can control chemical reactions.
temperature, surface area, concentration, catalysis, inhibitor
500
What are the 5 signs of a chemical change?
1) temperature change 2) color change 3) odor change 4) properties change 5) gas/percipitate produced
500
Draw and label an endothermic graph
check notes for answers
500
Balance the following equation: ____ Al + ____ HCl "yields" ____ H2 + ____ AlCl3
2 Al + 6 HCl "yields" 3 H2 + 2 AlCl3
500
Atoms are made-up of these subatomic particles
electrons, protons and neutrons (extras: protons and neutrons are made of up quarks and down quarks)