Chem Rxns
What is 1 type of evidence that a chemical reaction has occurred?
precipitate formation, gas formation, energy given off, color change
How many particles are in 1 mole?
Avogadro's number:
6.02 x 1023
How old will Ms. A be this September?
40
What type of bonding occurs between only nonmetals?
Covalent (creates molecules)
What are the 3 phases of matter?
gas, liquid, solid
What is conserved in a chemical reaction?
mass, matter
(energy only within the reaction + surroundings)
f.u.
How many years has Ms. A been teaching chemistry?
9
(every year I have taught)
How can you determine, just by looking at a formula, whether you are working with an ionic or covalent compound?
ionic: metal + nonmetal
(elements from both the L and R sides of the P.T.)
covalent: only nonmetal (on R side of P.T.)
What is the name of the Group 7 elements?
Halogens
A + B -> AB
synthesis
What do you need to be able to convert from grams of a substance to moles of that substance?
molar mass....found on the P.T.
What is Ms. A's favorite chemistry word?
STOICHIOMETRY
Describe how ionic bonding works.
(How do ionic compounds come together and form a bond?)
The metal gives up 1 or more electrons, becoming a positive ion.
The nonmetal accepts electrons, becoming a negative ion.
The + and - ions are attracted to each other electrostatically.
What information does the Atomic Number tell us?
It's an atom's identity- tells us which element we are working with.
How do you know you're dealing with a combustion reaction? (at least 2 reasons!)
Fuel & oxygen are reactants
Water & carbon dioxide are products
You want to find out how many particles are in a given mass of a substance.
How many steps will this dimensional analysis problem require?
1st: grams --> moles
2nd: moles --> particles
What is Ms.A's favorite activity (outside of school)?
Biking or Dancing
Name the compound:
FePO4
iron(III) phosphate
How can you determine how many neutrons an atom has, given the element type and its mass number?
Find the element on the P.T.
Determine it's Atomic Number- this is the number of p+
Subtract this number from the Mass Number given.
What is a feature of a single replacement reaction?
One single element reacts with a compound;
The individual element replaces its counterpart in the compound.
What is the "mole ratio" and how is it found?
Coefficients in a Balanced Chemical Reaction
Use to determine the ratio of any 2 substances in a reaction.
Colombia
Hong Kong
Saipan (kind of another country b/c it's on the other side of the world, but actually "belongs" to the USA...)
What is the formula AND name when the following elements combine:
aluminum + sulfur
aluminum sulfide
Al2S3
If I say "two atoms are isotopes of each other", what does this mean?
They are two atoms of the same element- they have the same number of p+'s.
However, they have different numbers of neutrons, which means they also have different Mass Numbers.