Density, molarity, and conversions, oh my
1 mol of NaCl contains how many particles?
6.022 x 1023
LiCl
lithium chloride
Melting, vaporization, and sublimation are examples of ______ phase changes, meaning that they ______ energy.
An pencil has a mass of 7.9g. When dropped into a beaker of water containing 21.4 mL of water, the water level rises to 33.6 mL. What is the density of the pencil?
.65 g/mL
To determine whether a precipitate will form in a double displacement reaction, consult your _______ ____.
solubility table
Molarity and moles have a ____ relationship, whereas molarity and L have a _____ relationship. (hint: think about proportionality)
direct; inverse
Copper (II) sulfate
Covalent compound formulas may be ______ or ______, where ionic compound formulas are always ______.
molecular or empirical; empirical
How many grams of oxygen are in 8376 g of H2O?
7437 g oxygen
An Arrhenius acid produces ____ when added to water.
H+ ions
Equal masses of chlorine gas (3.2 g/L) and oxygen gas (1.43 g/L) are housed in separate containers. Which container has a smaller volume?
chlorine gas
H2SO3
sulfurous acid
In chemical reactions, the _____ reactant determines how much product can be formed.
limiting
In the following chemical reaction, how much product (in mol) can be formed? We begin with 4 mol of N2 and 6 mol of Br2
N2 + 3Br2 --> 2NBr3
4 mol NBr3
One of the products in an acid-base reaction is always ___.
water H2O
A nanometer contains how many meters?
10-9
Hexapotassium tetrafluoride
K6F4
Atoms gain and lose electrons in order to become _____ with their nearest noble gas.
isoelectronic
How many mL of 4.3 M HCl can be created from 15 mL of 8.97 M HCl?
31 mL
_______ ___ are present in complete ionic equations but are not present in net ionic equations.
Spectator ions
In limiting reactant problems, when we convert between substances, we use the _____; when we convert between units, we use the _____.
mole ratio; molar mass
MnPO4
manganese (III) phosphate
When writing the formula for a chemical compound, use _____ to ensure that the formula is neutral; when balancing a chemical equation, use _____ to ensure that the equation is balanced.
subscripts; coefficients
Find the molecular formula of a compound that is 29.4% nitrogen and 70.6% oxygen that is experimentally determined to have a molar mass of 184.06 g/mol
N4O8
_____ dissociate into ions when dissolved in water.
Electrolytes