Chemistry Final
In an equation, the symbol for a substance in water solution is followed by
(aq).
which coefficients correctly balance the formula equation CaO+ H₂O = Ca(OH)₂
1,1,1
the formulas for the products of the reaction between sodium hydroxide and sulfuric acid are
A. Na2SO4 and H20
which is an example of effusion
A. air slowly escaping from a pinhole in a tire
the decomposition of a substance by an electric currant is called
A. electrolysis
For the reaction represented by the equation 2H2 + O2 -> 2H2O, how many moles of water can be produced from 6 mol of oxygen?
C. 12 mol
sulfur trioxide react with excess water to produce 575 g
D. 93.9%
if chlorine gas is produced by a halogen replacement, the other halogen in the reaction must be
D. Fluorine
magnesium bromide (aq) + chlorine (g) yields
D. MgCl2(aq) and Br2(l)
which reactants controls the amount of product formed in a chemical reaction
D. limiting reactant
A chemical formula written over the arrow in a chemical equation signifies
a catalyst for the reaction
In a chemical reaction
the mass of the reactants equals the mass of the products
Chapter 10
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Chapter 8
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Chapter 9
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How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water?
.O2
which coefficients correctly balance the formula equation NH₄NO₂(s) = N₂(g)+ H₂O(l)?
1,1,2
For the reaction represented by the equation Pb(NO3)2 + 2KI → PbI2 + 2KNO3, how many moles of lead(II) iodide are produced from 300. g of potassium iodide and an excess of Pb(NO3)2?
A. 0.904 mol
For the reaction represented by the equation 2Na + 2H2O → 2NaOH + H2, how many grams of hydrogen are produced if 120 g of sodium and 80 g of water are available?
A. 4.5 g
For the reaction represented by the equation CH4 + 2O2→ CO2 + 2H2O, how many moles of carbon dioxide are produced from the combustion of 100? g of methane?
A. 6.23 mol
For the reaction represented by the equation N2 + 3H2 -> 2NH3, how many moles of nitrogen are required to produce 18 mol of ammonia?
A. 9.0 mol
what determines the average kinetic energy of the molecules of any gas
A. Temperature
according to the kinetic molecualr theory, particles of matter
A. are in constant motion
an insoluble gas that forms in a double-displacement reaction in aqueous solution
A. bubbles out of solution
to balance a chemical, it may be necessary to adjust the
A. coefficients
in what kind of reaction does a single compound produce two or more simpler substances?
A. decomposition reaction
in what kind of reaction does one element replace a similar element in a compound?
A. displacement reaction
the reaction represented by the equation Pb(NO₃)₂(aq)+ 2Kl(aq) = PbI₂(s)+ 2KNO₃(aq) is a
A. double-displacement reaction
the units of molar mass are
A. g/mol
the replacement of bromine by chlorine in a salt is an example of a single displacement reaction by
A. halogens
the density of a substance undergoes the greatest change when the substance changes from a
A. liquid to gas
a balanced chemical equation allows one to determine the
A. mole ratio of any two substances in the reaction
predict what happens when nickel is added to potassium chloride
A. no reaction occurs
what is the study of the mass relationships among reactants and products in a chemical reaction?
A. reaction stoichiometry
the reaction represented by the equation 2Mg(s)+ O₂(g) = 2MgO(s) is a
A. synthesis reaction
if the percentage yield is equal to 100%, then
A. the actual yield is greater than theoretical yield
in the chemical equation wa + xb --> yc + zd if one knows the mass of a and the molar masses of a b c and d one can determine
A. the mass of any of the reactants or products
what can be predicted by using an activity series?
A. whether a certain chemical reaction will occur
in the reaction represented by the equation n2 +3h2 --> 2nh3 what is the mole of nitrogen to ammonia
B. 1:2
in the reaction represented by the equation c + 2h2 --> ch4 what is the mole of hydrogen to methane
B. 2:1
For the reaction represented by the equation 2Na + Cl2→ 2NaCl, how many grams of chlorine gas are required to react completely with 2.00 mol of sodium?
B. 70.9 g
under which conditions do real gases most resemble ideal gases
B. Low pressure and high temperature
an element in the activity series can replace any element
B. below it on the list
predict what happens when calcium metal is added to a solution of magnesium chloride
B. calcium chloride forms
when heated, a metal carbonate decomposes into a metal oxide and
B. carbon dioxide
the equation AX = A+ X is the general equation for a
B. decomposition reaction
the reaction represent by the equation 2KClO₃(s) = 2KCl(s) + 3O₂(g) is a
B. decomposition reaction
in what kind of reaction do the ions of two compounds exchange places in aqueous solution to form two new compounds?
B. double- displacement reaction
in most chemical reactions the amount of product obtained is
B. less than the theoretical yield
a chemical reaction involving substances a and b stops when b is completely used. b is the
B. limiting reactant
in the chemical reaction represented by the wA+xB+zD a comparison of the number of miles to A to the number of moles C would be a
B. mole ratio
what is the ratio of the actual yield to the theoretical yield, multiplied by 100
B. percentage yield
the coefficients in a chemical equation represent the
B. relative numbers of moles of reactants and products
a chemical equation is balanced when the
B. same number of each kind of atom appears in the reactants and in the products
which is an example of gas diffusion
B. the odor of perfume spreading throughout a room
what happens to the volume of a gas during compression
B. the volume decreases
Which of the following is a formula equation for the formation of carbon dioxide from carbon oxygen?
C + O2 = CO2
For the reaction represented by the equation 2Na+2H2O-->2NaOH+H2, how many grams of sodium hydroxide are produced from 3.0 mol of sodium with an excess of water?
C. 120 g
For the reaction represented by the equation Cl2 + 2KBr → 2KCl + Br2, how many grams of potassium chloride can be produced from 300 g each of chloride and potassium bromide?
C. 188 g
The Haber process for producing ammonia commercially is represented by the equation N2(g)+3H2(g)--> 2NH3(g). To completely convert 9 mol hydrogen gas to ammonia gas, how man mols of nitrogen gas are required?
C. 3 mol
in the reaction represented by the equation n2 + 3h2 --> 2nh3 what is the mole of hydrogen to ammonia
C. 3:2
For the reaction represented by the equation AgNO3+NaCl-->NaNO3+AgCl, how many moles of silver chloride, AgCl, are produced from 7.0 mol of silver nitrate AgNO3?
C. 7.0 mol
which process can be explained by the kinetic molecular theory
C. Condensation
what is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions?
C. activity series
if one knows the mole ratio of a reactant and product in a chemical reaction, one can
C. calculate the mass of the product from a known mass reactant
according to the kinetic molecular theory, gases condense into liquids because of
C. forces between molecules
in one type of synthesis reaction, an element combines with oxygen to yield an
C. oxide
the equation A+ BX = AX+ B is the general equation for a
C. single- displacement reaction
the reaction represented by the equation Cl₂(g)+ 2KBr(aq) = 2KCl+ Br₂(l) is a(n)
C. single-displacement reaction
the reaction represented by the equation Mg(s)+ 2HCl(aq) = H₂(g)+ MgCl₂(aq) is a
C. single-displacement reaction
the equation A+ X = AX is the general equation for a(n)
C. synthesis reaction
according to the kinetic molecular theory, which is the most significant difference between gases and liquids
C. the distance between the particles
in a double displacement reaction hydrogen chloride and sodium hydroxide react to produce sodium chloride. another product is
C. water
For the reaction represented by the equation Cl2 + 2KBr → 2KCl + Br2, how many moles of potassium chloride are produced from 119 g of potassium bromide?
D. 1.00 mol
For the reaction represented by the equation 2H2+O2-->2H2O, how many grams of water are produced from 6.00 mol of hydrogen?
D. 108 g
For the reaction represented by the equation C + 2H2 ---> CH4, how many moles of hydrogen are required to produce 10 mol of methane, CH4?
D. 20 mol
which equation is not balanced
D. 2H2 + O2 + H2O
which equation is not balanced?
D. 2H₂+ O₂ = H₂O
For the reaction represented by the equation SO3 + H2O → H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid in an excess of water?
D. 320 g
In the equation 2KClO3-->2KCl+3O2, how many moles of oxygen are produced when 3.0 mol of KClO3 decompose completely?
D. 4.5
in the reaction represented by the equation 2al2o3--> 4al+3o2 what is the mole of aluminum to oxygen
D. 4:3
For the reaction represented by the equation 2Na + Cl2→ 2NaCl, how many grams of sodium chloride can be produced from 500 g each of sodium and chloride?
D. 824 g
which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?
D. Stoichiometry
what is the measured amount of a product obtained from a chemical reaction
D. actual yield
the reaction represented by the equation 2Hg)(s) = 2Hg(l)+ O₂(g) is a
D. decomposition reaction
the equation AX+ BY = AY+ BX is the general equation for a
D. double-displacement reaction
predict what happens when lead is added to nitric acid
D. hydrogen is released
predict what happens when zinc is added to water
D. hydrogen is released
oxides of active metals, such as CaO, react with water to produce
D. metal hydroxides
when the limiting reactant in a chemical reaction is completely used the
D. reaction stops
the kinetic molecular theory explains the behavior of
D. solids, liquids, and gases
in what kind of reaction do two or more substances combine to form a new compound?
D. synthesis reaction
to determine the limiting reactant in a chemical reaction involving known masses of a and b. one could first calculate
D. the number of moles of b and the number of moles of a available
unlike in an ideal gas, in a real gas
D. the particles exert attractive forces on each other
In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is
H2
What is the small whole number that appears in front of a formula in a chemical equation?
a coefficent
When a solid produced by a chemical reaction separates from the solution it is called?
a precipitate
Which observation does not indicate that a chemical reaction has occurred?
change in the total mass of substances
tell what type of chemical reaction is represented by the following formula equation. then balance the equation
combustion C3H8(g)+5O2(g) ---> 3CO2(g)+4H20(l)
A chemical equation is balanced when
same number of each kind of atom appears in the reactants and in the products
