chem 7 & 8
what is the oxidation number of phosphorus in the PO3-/4 ion?
+5
the chemical formula for an ionic compound represents one ___.
formula unit
the platinum (ii) ion and the platinum (iv) ion ____.
have charges of 2+ and 4+, respectively.
if a certain metal is placed in an ionic solution containing another metal and no reaction occurs, then the metal originally in the solution is ___.
higher on the activity series
predict what happens when lead is added to nitric acid.
hydrogen is released
an active metal and a halogen react to form a(n) ____.
salt
what type of chemical reaction does the following chemical equation represent? 2HCl(aq)+Cr(s) yields H2(g) +CrCl2(aq)
single-displacement
oxides of active metals, such as CaO, react with water to produce ___.
metal hydroxides
which equation below violates the law of conservation of mass?
KCl + Br2 yields KBrCl2
what is the empirical formula for a compound that contains 12.62% Li, 29.17% S, and 58.21% O?
LiSO2
what is the correct formula for the compound made of magnesium and nitrogen?
Mg3N2
magnesium bromide (aq) + chlorine (g) yields ____.
MgCl2(aq) and Br2(l)
what is the formula for the compound dinitrogen tetroxide?
N2O4
what is the molecular formula for the compound that is made up of 30.45 g N and 69.55 g O, and has a formula mass of 92.02 amu?
N2O4
in a chemical equation, the formula of a substance in water solution is followed by the symbol ___.
(aq)
the formation of solid product in a chemical reaction is represented by the symbol ___.
(s)
what is the oxidation number of nickel in NiCO3?
+2
how many moles of compound are there in 15.0 g of potassium dichromate, K2Cr2O7? (the molar mass of K2Cr2O7 is 294.2 g).
0.0510 mol
what is the molar mass of pure tin?
118.71 g/mol
how many atoms are present in one formula unit of barium acetate, Ba(C2H3O2)2?
15
which set of coefficients will balance the equation below? NaOH+Cu(NO3)3 yields Cu(OH)2+NaNO3
2, 1, 1, 2
which coefficients correctly balance the formula equation below?
2, 2, 3
which equation is not balanced?
2H2 + O2 yields H2O
which reaction can be predicted from the activity series?
2H20(aq)+2Na(s) yields 2NaOH(aq)+H2(g)
which reaction does not occur?
2HF(aq)+Cl2(g) yields F2(g)+2HCL(aq)
what is the total number of molecules that is represented by the following chemical equation?
4
what is the correct formula for copper (I) cyanide?
CuCN
what is the formula for carbonic acid?
H2CO3
you have an unknown metal, x. you conduct two experiments. the results are shown in the table below. which of the following statements is a logical conclusion based on the experimental data?
the unknown metal is higher on the activity series that zinc, but below sodium.
what can be predicted by using an activity series?
whether a certain chemical reaction will occur
the activity series helps to predict ___.
whether or not a specific chemical reaction is possible
which of the following molecular formulas does not have the corresponding empirical formula xy2z?
xyz
metal x replaces the ions of metal y from solution, but it cannot replace the ions of metal z from solution. the order these metals should have in the activity series (from top to bottom) is ___.
z, x, y
what is the name of the compound made of zinc ions, Zn2+, and fluoride ions, F-?
zinc fluoride
which of the following equations represents the balanced equation for the reaction of iron and oxygen?
4Fe3O2 yields 2Fe2O3
what is the mass percentage of cobalt in cobalt (ii) fluoride, CoF2?
60.80%
what is the mass of 4.80 mol of barium hydride, BaH2?
669 g
what symbol indicates a reversible reaction?
<--- ---->
what is the formula for the compound made of aluminum ions , Al3+, and sulfate ions, SO2-/4
Al2(SO4)3
an ion of bromine with a single negative charge has the symbol and the name ___.
Br- (bromide ion)
what is the molecular formula for the compound with a formula mass of 58.12 amu and empirical formula of C2H5?
C4H10
if calcium is listed above magnesium in the activity series, and magnesium is listed above zinc, which of the following reactions is possible?
Ca(s) + MgCl2(aq) --->
what is the correct notation for a calcium ion whose outershell is a full octet?
Ca^2+
what is the correct formula for the compound platinum (VI) fluoride?
PtF6
what is the chemical formula for the compound made of tin (iv) ions and chloride, Cl-, ions?
SnCl4
what is the total number of molecules represented by the following equation?
___
in the expression 3CO2, the numbers 3and 2 are, respectively, ___.
a coefficient and a subscript
what will be the result of the reaction described by the following chemical equation? PCl5(g)<--- --->PCl3(g)+Cl2(g)
a mixture of PCl5(g), PCl3(g), and Cl2(g)
the term acid usually refers to ___.
a solution of the acid compound in water
what is the correct name for the acid CH3COOH
acetic acid
the ability of an element to react is the element's ___.
activity
what is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions?
activity series
to balance a chemical equation, you must ___.
adjust the coefficients
from a complete and correctly written chemical equation, you can obtain the ___.
all of the above
which of the following is true regarding double-displacement reactions?
all of the above
which of the following may indicate that a chemical reaction has occurred?
all of the above
the formula mass of any compound is described in units of ___.
amu
the activity series of metals indicates the ease with which metal ___.
atoms lose electrons
an element in the activity series can replace an element ___.
below it on the list
in a single-displacement reaction, an element in the activity series most likely can replace any element ___.
below it on the list
which of the following is a product in the reaction described by the word equation below? iron + copper (ii) sulfate yields iron (ii) sulfate + copper
both (a) and (b)
in the reaction described by the word equation sodium + water yields sodium hydroxide + hydrogen gas ___.
both (a) and (c) (sodium hydroxide is a product and water is a reactant)
predict what happens when calcium metal is added to a solution of magnesium chloride.
calcium chloride forms
a mixture of propane and oxygen react to form carbon dioxide and water. what type of chemical reaction is this?
combustion
calcium carbonate, CaCO3, reacts to form calcium oxide, CaO, and carbon dioxide, CO2. what type of reaction is this?
decomposition
what is the correct name for the compound P2Cl4?
diphosphorus tetrachloride
oxidation numbers are used to indicate the ___.
distribution of electrons among the bonded particles in a compound
the simplest whole-number ratio of moles of each element in a compound is known as the ___.
empirical formula
which of the following is true regarding the law of conservation of mass?
it dictates that the number of atoms of each element must be the same on both sides of a chemical equation
which of the following is not true regarding a properly written chemical equation?
it must show the formation of a precipitate or a gas
if metal x is lower than metal y in the activity series, then metal x ___.
loses electrons less readily than does metal y
what is the correct name for the compound Ni2O3 using the stock system?
nickel (iii) oxide
what is the correct name for the NO-3 ion?
nitrate
the salt calcium nitrate, Ca(No3)2, contains the anion from ___.
nitric acid
predict what happens when nickel is added to a solution of potassium chloride.
no reaction occurs
predict what happens when zinc is added to water.
no reaction occurs
which of the following is true regarding single-displacement reactions?
one element replaces another in a compound
what does CH4 represent in the balanced chemical equation shown below?
one molecule of CH4
atoms have an oxidation number of zero in a(n) ___.
pure element
you mix solution a with solution b in a beaker. which of the following observations does not help you prove that a chemical reaction has occurred?
solution a, solution b, and the mixture are all yellow
what follows an element's symbol in a chemical formula to indicate the number of atoms of that element in one molecule of the compound?
subscripted number
in which type of reaction do two or more compounds react to form one product?
synthesis
what type of chemical reaction is represented by the following word equation? iron + oxygen yields iron (ii) oxide
synthesis
the molar mass of water is equal to ____.
the mass of 1 mol of O plus the mass of 2 mol of H
which of the following indicates that a chemical equation is balanced?
the numbers of atoms of each elements are the same on both sides of the equation
the greek letter delta (/\) above the arrow in a chemical equation means ___.
the reactants are heated