Chem Exam 2
what is the oxidation state of the underlined element of Cl2
0
you have 14.2 g Na how many moles is that?
0.618 moles Na
We have 8.25 g of C. How many moles is that?
0.687 moles C
What are the steps to find the ratio of a compound?
1. convert mass to moles 2. write out the pseudoformula 3. divide by the lowest number percent (once you divide if one of the numbers isnt a whole number you have to multiple till you get a whole number)
what are the steps to finding empirical formula?
1. find mass of each element 2. convert g of reactant to moles 3. write a pseudoformula using moles 4. divide each by lowest value 5. if subscripts are not .1 of a whole number multiply till you get one.
whats the molecular formulas weight of C6H12O6?
180.18g molecular formula weight. you multiply the atomic mass by how ever may subscripts the element has. so C is 12.01 times 6.
You have 27000 tons of PbS. How much lead could be produced from the 27000 tons of PbS? Mass % Pb= mass Pb/mass PbS * 100%
23382 tons Pb
Balance N2H4(l) >>> NH3 (g) + N2 (g)
3, 4, blank
What's the empirical formula weight of C1H2O1?
30.03g empirical formula weight
how much is 1 mole?
6.02 x 10^23
what is the mass of MgCl2 ?
95.21g MgCl2
Determine whether each redox reation occurs spontaneously in the forward direction. a) Ni(s) + Zn charge 2+(aq) >>> Ni charge 2+(aq) +Zn(s) b) Ni(s) + Pb charge 2+(aq) >>> Ni charge 2+n(aq) + Pb(s) c) Al(s) + 3Ag possitive 1 charge(aq) >>> 3Al 3+ charge(aq) + Ag(s) d)Pb(s) + Mn 2+ charge (aq) >>> Pb 2+ charge(aq) + Mn(s)
B and C occur spontaneously in the forward direction.
Formula for Boron Pentachloride
BCl5
Nicotine, a stimulant found in tobacco, has the mass percent composition: C, 74.03% H, 8.70%, N, 17.27%. the molar mass of nicotine is 162.26 g/mol. Find the molecular formula of nicotine.
C10H14N2
the molecular formula is C6H12O6. what is the emperical formula?
C1H2O1
Acetate
C2H3O2 negative charge
Butanedione, a component of butter and body odor, has a cheesy smell. elemental analysis of butanedione gave the mass percent composition: C, 55.80% H, 7.03% O, 37.17%. The molar mass of butanedione is 86.09 g/mol. Determine the molecular formula of butanedione.
C4H6O2
identify the oxidized substance in CH4 + 2O2 > CO2 + 2H2O
CH4
Cyanide
CN charge -1
Carbonate
CO3 charge -2
What do oxidation-reduction reactions produce?
Carbon dioxide and water
What is H2CO3
Carbonic acid
Acids
Chemical formula starts with an H and also contains nonmetals.
Hypochlorite
ClO charge -1
Chlorite
ClO2 charge -1
Chlorate
ClO3 charge -1
Perchlorate
ClO4 charge -1
write the formula for Cobalt (111) Bromide
CoBr3
write the name for CoCl2
Cobalt (11) Chloride
write the formula for Copper (11) Hydroxide
Cu(OH)2
electrolytes
Gatorade has electrolytes. its an ionic compound dissolved in water. produce ions in water.
Hydrogen Carbonate
HCO3 charge -1
what is the acid HCl
Hydrochloric acid
What is the name of the acid HF
Hydroflouic acid
One of the random things he talked about
In Chicago someone took capsules and put KCN charge negative in them and put them back on the shelf's and 7 people died.
Write the name for PbCl4
Lead (IV) Chloride
which is the most difficult to reduce Li, K, Ca, Na
Li+
whats the reducing agent and the oxidizing agent Mg(s) + Cu^2 (aq) > Mg^2(aq) + Cu(s)
Mg reducing Cu^2 oxidizing
Write the formula for Magnesium Flouride
MgF2
Ammonium
NH4+
Nitrite
NO2 negative 1 charge
Nitrate
NO3 charge -1
Write the formula for Sodium Oxide
Na2O
use double displacement reaction for Sodium Sulfate and barium chloride 1. write the correct chemical formula 2. identify the solid or precipitate 3. balance the equation.
Na2SO4 (aq) + BaCl2 (aq) >>> 2 NaCl (aq) + BaSO4 (s)
HNO3 negative 1 charge is?
Nitric Acid
Hydroxide
OH-
whats the molecular formula of P2O3?
P4O6
Phosphate
PO4 charge 3-
Name this compound PCl3
Phosphorous Trichloride
Sulfite
SO3 charge -2
Sulfate
SO4 charge -2
write the formula for Tin (11) Flouride
SnF2
Formula for Tin (IV) Oxide
SnO2
what is the name of NaCl?
Sodium Chloride
What is the mass of one mole of MgO?
You have one mole Mg which is 24.31g Mg. then one mole of O which is 16.00g O. You add the two and get 40.31 g MgO and thats your answer.
Binary Acids, whats the set up for naming them?
[Hydro] [ Bare name of the nonmetal and and -ic at the end] [ Acid]
Ionic compounds
a metal and a nonmetal
what is the oxidation state of Cl in each ion? a) ClO charge negative 1 b) ClO2 charge negative 1 c) ClO3 charge negative 1 d) ClO4 charge negative 1
a) +1 b)+3 c)+5 d)+7
what is the oxidation state of nitrogen in each compound? a) NO b) NO2 c) N2O
a) +2 b)+4 c) +1
Name these Compounds a) MgBr2 b) CaI2 c) Na2O d) AlN
a) Magnesium Bromide b) Calcium Iodide c) Sodium Oxide d) Aluminum Nitride
Write a molecular equation for the precipitation reaction that occurs (if any) when each pair of solution is mixed. if no reaction occurs, write no reaction. a) sodium carbonate and lead(11) nitrate b) potassium sulfate and lead(11) acetate c) copper(11) nitrate and barium sulfide d) calcium nitrate and sodium iodide
a) Na2CO3 (aq) + Pb(NO3)2 (aq) >>> PbCO3 (s) + 2NaNo3 (aq) b) K2SO4 (aq) + Pb(C2H3O2)2 (aq) >>> PbSO4 (s) + 2KC2H3O2 (aq) c) Cu(NO3)2 (aq) + BaS (aq) >>> CuS (s) + Ba(NO3)2 (aq) d) No Reaction
assign an oxidation state to each atom in each polyatomic ion a)CO3 charge 2- b) OH charge negative 1 c) NO3 charge negative 1 d) NO2 charge negative 1
a)C= +4 O= -2 b) O= -2 H= +1 c) N= +5 O= -2 d) N= +3 O= -2
Balance CH4 (g) + O2 (g) >>> CO2 (g) + H2O (g)
blank, 2, blank,2
soluble and insoluble
compound dissolve in a particular liquid compound that doesn't dissolve
oxyacids
contain polyatomic ions
the oxidation number of sulfur in SO3 is -6
false
Another thing he talked about
in Oklahoma City, two people were charged with a terrorist attack. they used ammonium nitrate mixed with diesel fuel and blew up a building.
which of the following are true of a reducing agent
it causes reduction and it is the oxidized substance
what is HNO2
nitrous acid
molecular compound
nonmetals only
What is OIL RIG?
oxidation is loss, reduction is gain
what is the oxidation state of the underlined element the C in CO2
plus 4
oxidation involves
the loss of electrons
an electrochemical cell is based on the coupling of a spontaneous redox reaction
true
corrosion of metals may be prevented by keeping them dry at all times
true
oxidation can be defined as the gain of oxygen atoms by another element
true
reduction is the gain of electrons
true
the oxidizing agent is the substance being reduced
true
two methods to reduce corrosion of metals
use non-corrosion metals like stainless steel paint iron, prevent oxygen and water from getting to the metal
What do neutralization reactions produce?
water and salt
Another thing he talked about
when phosphate runs off and goes into the ocean it makes algae blooms. it makes the water fertilized and it creates dead zones that have no fish that live there Ex the Gulf of Mexico.
