Chem final
Determine the oxidation number of the underlined element in P5O10
+4
Determine the oxidation number of the underlined element in NaNO3-
+5
DEtermine the oxidation number of the underlined element in N2H5+
-2
Liquid propane boils at 231K. What is its boiling point in degree C?
-42 degree C
Heating MgSO4*7H20 at 150degreeC produces MgSO4*H20. If heating 24.4 g of pure MGSO4*... at 150degree C were to give 13.7 g of pure ... calculate the value for x
1
Calculate the molarity of the resulting solution prepared by diluting 25 mL of 18.0% ammonium chloride, NH4Cl, (density=1.05 g/mL) to a final volume of 80.0 mL.
1.10M
IF 45.0 mL of .250 M PbCl4 solution reacts with 20.0 mL of (NH4)2SO4, what is the molarity of the (NH4)2SO4?
1.13M
What is the specific heat of a 5.75 gram piece of metal if the additoiin of 175 joules of heat cases a 22.3 degree C temperature increase?
1.36 J/g*C
How many molecules are contained in 5.00 grams of NH3?
1.77X10^23
What mass of SrF2 can be prepared from the reaction of 10.0 g of Sr(OH)2 with excess HF?
10.3 g
Write the balanced formula unit equation for the complete neutralization of dilute H3PO4 with Ca(OH)2 in aqueous solution. what is the sum of the coefficients? (Do not forget coefficients of one.)
12
How many moles of carbon dioxide could be produced if 10 moles of octane, C8H18, are combined with 20 moles of oxygen?
12.8 mol
What mass of water is contained in 160 grams of 22.0% KCl solution?
125 g
Balance the following equation with the smallest whole number coeficients. What is the coefficient for O2 in the balanced equation
13
Calculate the molarity of a solution that contains 70.0 g of H2SO4 in 280 mL of solution
2.55M
The answer to the following calculation, rounded to the proper number of significant digits is
2.7 g/cm^3
What mass of tungsten is present in 10.0 lbs of wolframite, FeQO4?
2.75 kg
Determine the formula weight of K3PO4
212 amu
If a 10 g ball of iron at 160 degree C is dropped into 50 g of water at 20.0 degree C in an insulated container, what will be the final temperature of the water? The specific heat of iron is .444 J/g*C and that of water is 4.18 J/g*C
23 degree C
The 1970 standard established by the U.S. government for carbon monoxide emission for automobiles limited exhaust to 23 grams of CO per vehicle mile. Assume that in a given metropolitan area there are 82,700 automobiles, driven an average of 13.5 miles per 24 hour period. How many tons/day of CO could legally be discharged into the areas atmosphere
28.3 tons/day
A compound contains only calcium and fluorine. A sample of the compound is determined to contain 2.00g of calcium and 1.90 g of fluorine. According to the Law of Definite Proportions how much calcium should another sample of this compound contain if it contains 2.85 g of fluorine?
3.00 g
What is the molarity of 175 mL of solution containing 2.18 grams of Na2SO4*10H2O?
3.87X10^-2
What mass of fluoristan, SnF2, would contain the same mass of tin as 306 grams of cassiterite, SnO2
318 g
How many moles of O2 are required to react with 23.5 moles of methanol?
35.3
Witherite is a mineral that contains barium carbonate. If a 1.68 g sample of witherite were to react completely with 24.6 mL of .2558 M HCl, what would be the percent of barium carbonate in the witherite sample? ( Barium carbonate is the only compound present that reacts with the hydrochloric acid.)
37.0%
How many grams of CaCl2 equal 3.40 moles of CaCl2?
377 g
What volume of .130 M HCl solution will just react with .424 gram of Ba(OH)2?
38.1 mL
What volume of .132 M KOH solution would react completely with 25.8 mL of .198 M HCl according to the following equation? HCl+KOH-->KCl+H2O
38.7 mL
When heated lead nitrate decomposes according to the following equation. What is the coefficient for NO2 when the this equation is balanced with the smalles whole number coefficients? Pb(NO3)2-->PbO+O2+NO2
4
The sum 2.834+5.71520+2.12+178.1+250.2619 expressed to the proper number of significant figures is
439.0
The density of octane is .702. What is the mass of 65 mL of octane?
45.6 grams
A dolomite ore contains 40% pure MgCO3*CaCO3. No other compounds of magnesium or calcium are present in the ore. What mass of magnesium and what mass calcium are contained in 100 grams of this ore?
5.27 g Mg- 8.69 g Ca
An ore of lead is 45% pure lead sulfide, PbS, and 55% impurities in which no other lead compounds are present. What mass of lead is contained in 150 grams of this ore?
58.5 g
How many grams of nitric acid can be prepared from the reaction of 69.0 grams of nitrogen dioxide with 36 grams of water?
63.0 grams
The reaction of 5.0 g of fluorine with excess chlorine produced 5.6 g of ClF3. What percent yield of ClF3 was obtained?
69%
Acrylonitrile, C3H3N is a molecule used to produce a plastic called Orion. How many grams of acrylonitrile could be produced by reacting 583 g of propene, C3H6 with excess ammonia, Nh3 and Oxygen?
735 g
If a reaction of 5.0 g of hydrogen with 5 g of carbon monoxide produced 4.5 g of methanol, what was the percent yield?
79%
Propane (C3H8) burns in oxygen to form CO2 and H2O aaccording to the following equation. How many grams of O2 are required to burn 3.01X10^23 propane molecules?
80.0 g
One of the reacitons that take place inside a blast furnace to produce iron is the reduction of iron ore by carbon monoxide. Choose the answer that represents the sum of all the coefficients when this equation is balanced the smallest whole number coefficients Fe2O3+CO-->CO2+Fe
9
Perform the indicated mathematical operations and express the answer in scientific notation rounded off to the proper number of significant figures
9.6X10^8
What mass of phosphoric acid, H3PO4, would actually react with 7.17 grams of LiOH
9.80 g
Which of the following is the BEST definition of a salt?
A compound that contains a cation other than H+ and an anion other than OH- or O2-
Which element/symbol pair is incorrect?
Ag/Gold
Which element and group are not correctly matched?
Al (alkali metal)
Which of the following matched pairs of name and formula has an error?
Al(NO2)3
Which of the following statements is not an idea from Daltons atomic Theory?
Atoms can only be transformed into atoms of another element by nuclear reactions
Which on eof the following salts is insoluble in water?
Ba3(AsO4)2
Which of the following sets illustrates the Law of Multiple Proportions?
BrF, BrF3, BrF5
A compound contains carbon, oxygen, and hydrogen. Analysiss of a sample showed that it contained by mass 53.4% carbon and 11.1% hydrogen. What is the simplest formula for this compound?
C2H5O
Butane, a highly combustible hydrocarbon found in disposable lighters, has the chemical formula:
C4H10
A compound contains only carbon, Hydrogen and Oxygen. Analysis of a sample showed that it contained 54.53% C and 9.15% H. Its molecular weight was determined to be approximately 88 g/mol. What is its molecular formula?
C4H8O2
Analysis of a sample of a covalent compound showed that it contained 14.4% hydrogen and 85.6% carbon by mass. What is the empirical formula for this compound?
CH2
Which of the following is not a metathesis reaciotn?
CH4(g)+2O2(g)-->CO2+2H2O
Suppose you have a 100 gram sample of each of the following compounds. Which sample contains the smallest number of moles of the compound?
CrCl3
What is the formula for Copper(II) nitrate?
Cu(NO3)2
Which of the following is an intensive property of matter
Density
Which of the following represents the net ionic reaction for all strong acid/strong base reactions that produce a soluble salt?
H++OH--->H2O
Which of the following reactions is not a decomposition reaction
H2(g)+Cl2-->2HCl
Which one of the following is a weak electrolyte?
H2CO3
What are the oxidation numbers (oxidation states) of the elements in HCO3?
H=+1 C=+4 O=-2
Which of the following equations could not be a formula unit equation for the net ionic equation: H++OH--->H20
HCN+NaOH-->NaCN+H2O
Which of the following matched pairs of name and formula has an error?
HIO2
Each response below lists an ion by name and by chemical symbol or formula. Also each ion is classified as monatomic or polyatomic and as a cation or anion. Which response contains an error?
Hydroxide
Classify the following reaction by giving all of these reaction types that apply P4+10Cl2-->4PCl5
I and II
Classify the following reaction by giving all of these reaction types that apply Zn+2HCl-->ZnCl2+H2
I and IV
Which response lists all the physical changes but no chemical changes?
I, III, IV
Which response includes all of the following that involve chemical changes, and none that involve physical changes
I, III, and IV
Which response includes all of the following substances that are strongle electrolytes, and no others?
I,II, and III
Which response includes only soluble salts and no others?
I,V
Which response includes all of the following that are displacement reactions, and no other reactions?
II
Which response includes all the following that are chemical properties of carbon and no physical properties?
II
Which response includes all the following that are oxidation reduction reactions, and no others
II, V
Which response lists all of the following properties of sulfur that are physical properties and no other properties?
II,III, IV, and V
Which of the following statements about density is incorrect?
If oil and water are placed in a container, they form two layers with oil as the top layer because it has the greater density.
Which statement regarding nitric acid is false?
It only slightly ionizes in aqueous solution.
Calculate the percent composition of K2CO3
K=56.6% C=8.7% O=34.7%
Which of the following matched pairs of name and formula has an error
Mn2O3 manganese(II) oxide
A compound contains, by mass, 87.5% nitrogen and 12.5% hydrogen. Its molecular weight is found to be 32 g/mol. What is its molecular formula?
N2H4
Will a precipitate form when .1M aqueous solutions of NH4NO3 and NaBr are mixed? if it does form, identify the net ionic equation for the reaction.
NO PRECIPITATE FORMS
Ernest Rutherfords model of the atom did not specifically include the
Neutron
Which of the following is not a mixture?
Oxygen
Will a precipitate form when .1M aqueous solutions of HBr and Pb(CH3COO)2 are mixed? if a precipitate does form, identify the precipitate and give the net ionic equation for the reaction.
PbBr2 precipitates2[H++Br-]...
A compound contains sulfur, oxygen, and chlorine. Analysis shows that it contains by mass 26.95% sulfur and 59.61% chlorine. What is the simplest formula for this compound?
SOCl2
Which of the following is a metalloid?
Si
From the following ionic compounds, choose the name formula pair that is not correctly matched.
Sodium Sulfate
Which element has a mass that is 7.30 times that of Carbon-12
Sr
Name the molecular compound, H2SO4
Sulfuric Acid
When a solution is diluted, what is the relationship of the number of moles of solute in the more concentrated initial volume of solution to the number of moles of solute in the less concentrated final volume of solution?
The number of moles of solute in both solutions is the same
Which of the following is an extensive property of matter?
Weight
What is the total ionic equation for the following formula unit equation?
[Ba2+2Cl-]+[2Na++(SO4)2-]--> BaSO4+2[Na++Cl-]
Balancing a chemical equation so that it obeys the law of conservation of matter requires
adjusting the coefficients in front of the formulas so there are the same number and type
Which response includes all the compounds listed below and only the compounds?
another one or another combination
The chemical behavior of a group of elements is determined by the --------- of the atoms in the group.
atomic numbers
Which of the following has a negative charge?
electron
Crude oil can be separated into gasoline, diesel, heating oil, etc. by difference in boiling points. The form of matter which would best describe crude oil is
homogenous mixture
Classify the following reaction by giving the reaction type that applies.
metathesis
Which of the following reactions is (are) not metathesis reactions?
only 1
Classify the following reaction by giving all of these reaction types that apply. CaCO3-->heat-->CaO+CO2
only III
What is the correct name for NaClO?
sodium hypochlorite
In the following reaction oxygen is
the oxidizing agent and is reduced