a salt with water bonded to the ions in the crystal structure
100
True or False Stoichiometry is calculations of the quantities in chemical reactions, based on an unbalanced chemical equation.
False
100
Name 3 units commonly used to measure pressure in gases.
atm, Torr, mmHg, kPa
100
What is a limiting reactant? (What does it do?)
A limiting reactant in a chemical reaction is the substance that -Is used up first -Stops the reaction -Limits the amount of product that can form
200
Where did the number for a mole come from?
The number of atoms in 12 g of pure Carbon-12
200
What is the name for BaCl2•2H2O ?
barium chloride dihydrate
200
True or False. The law of conservation of matter applies to mass and atoms, but volume is not always conserved.
True
200
In ideal gases, there is no _______________ or ______________ between gas particles.
attraction, repulsion
200
What is the formula for percent yield?
actual yield/theoretical yield x 100
300
Name 3 types of "representative particles".
molecules, atoms, formula units, ions
300
A substance that absorbs water from the air is said to be _____________.
hygroscopic
300
What is the empirical formula for glucose? (C6H12O6)
CH2O
300
What is the strongest type of intermolecular force?
hydrogen bonds
300
If a chemist was supposed to produce 68g of KCl, but only produced 47g, what was her percent yield?
69%
400
How many moles are there in 76.44 g H3PO4?
0.78 mol
400
What is the name for FeSO4•6H2O?
iron (II) sulfate hexahydrate
400
What is the rhyme to help you remember the steps to finding the empirical formula?
percent to mass mass to mole divide by small multiply by whole
400
I am going to draw a phase change diagram on the board. You must come to the board and label the states of matter and the phase changes
see board
400
21g of CaCO3 produce 7.2g of CaO, what is the % yield? CaCO3 --> CaO + CO2
61.2%
500
Why do we use the mole in chemistry?
it is used as a counting unit because individual atoms or molecules are far too small to work with by themselves
500
A 15.67 g sample of a hydrate of magnesium carbonate was heated to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?
MgCO3 · 5H2O
500
What is the empirical formula for a compound containing 50.0% C, 5.5% H, and 44.4% O?
C3H4O2
500
All polar compounds have which type of intermolecular force?
dipole-dipole
500
50g of Al are added to 100g HCl, how many grams of H2 are produced? 2Al + 6HCl --> 2AlCl3 + 3H2