Answers26-27 WHS-Chemistry-1stSixWeeksThe History and Arrangement of the Periodic Table

The History and Arrangement of the Periodic Table — Cumulative exam Answers

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Consider the chemical equation for the combustion of sugar._C6H12O6(s) + _O2(g) _CO2(g) + _H2O(l)Which sequence of coefficients should be placed in the blanks to balance this equation?

Question illustration
A
1, 6, 6, 6
B
6, 1, 6, 1
C
3, 3, 3, 6
D
1, 3, 3, 6
2
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Which symbol can be used to indicate a chemical reaction that takes place in the presence of a catalyst?

A
350 degrees Celsius over a right-pointing arrow.
Option A
B
Upper P t over a right-pointing arrow.
Option B
C
0.5 a t m over a right arrow.
Option C
D
Delta over a right arrow.
Option D
3

Which characteristic best identifies a decomposition reaction?

A
a single compound as a reactant
B
a single compound as a product
C
an element and a compound as reactants
D
an element and a compound as products
4

Which shows the correct relationship between the molecular formula and the empirical formula for C2H10N2?

A
molecular formula = 2 empirical formula
Option A
B
empirical formula = 2 molecular formula
Option B
C
molecular formula = 62.1 empirical formula
Option C
D
empirical formula = 14 molecular formula
Option D
5

What is the percent by mass of oxygen in carbon dioxide (CO2)?Use .

Question illustration
A
27.29%
B
57.12%
C
72.71%
D
79.99%
6

Which type of reaction is represented by the generic equation AB + CD AD + CB?

Question illustration
A
combustion
B
decomposition
C
single replacement
D
double replacement
7

The equation shows lead reacting with sulfuric acid to produce lead sulfate and hydrogen gas.Which type of chemical reaction does this equation represent?

Question illustration
A
synthesis
B
decomposition
C
single replacement
D
double replacement
8

This formula equation is unbalanced.Pb(NO3)2(aq) + Li2SO4(aq) PbSO4(s) + LiNO3(aq) Which coefficient should appear in front of LiNO3 in the balanced equation?

Question illustration
A
1
B
2
C
3
D
4
9

What is the word equation for atoms of magnesium reacting with molecules of oxygen to produce magnesium oxide?

A
magnesium + magnesium oxide oxygen
Option A
B
magnesium + oxygen magnesium oxide
Option B
C
magnesium oxide + oxygen magnesium
Option C
D
magnesium + oxygen magnesium + oxygen
Option D
10

Which reaction will most likely take place based on the activity series?Li > K > Ba > Ca > Na > Mn > Zn > Cr > Fe > Cd > Ni > H > Sb > Cu > Ag > Pd > Hg > Pt

A
Pt + FeCl3
Option A
B
Mn + CaO
Option B
C
Li + ZnCO3
Option C
D
Cu + 2KNO3
Option D
11

What is the percent by mass of potassium in K3Fe(CN)6?Use .

Question illustration
A
16.96%
B
21.88%
C
25.53%
D
35.62%
12

Which represents the empirical formula for X4Y8?

A
XY2
B
X2Y4
C
X4Y8
D
XY
13

Consider the unbalanced equation for the oxidation of butene.C4H8 + 6O2 CO2 + H2OFor each molecule of C4H8 that reacts, how many molecules of carbon dioxide and water are produced?

Question illustration
A
two carbon dioxide molecules and two water molecules
B
four carbon dioxide molecules and four water molecules
C
two carbon dioxide molecules and four water molecules
D
four carbon dioxide molecules and two water molecules
14

Which chemical equation is unbalanced?

A
C + O2 CO2
Option A
B
Sr + O2 2SrO
Option B
C
6H2 + 3O2 6H2O
Option C
D
H2 + H2 + O2 H2O + H2O
Option D
15

Using the activity series provided. Which reactants will form products?Na > Mg > Al > Mn > Zn > Cr > Fe > Cd > Co > Ni > Sn > Pb > H > Sb > Bi > Cu > Ag

A
Ag +NaNO3
Option A
B
Fe + Al2O3
Option B
C
Ni + NaCl
Option C
D
Fe + Cu(NO3)2
Option D
16

Which formula equation represents the burning of sulfur to produce sulfur dioxide?

A
Upper S (s) plus upper O subscript 2 (g) right arrow with delta above upper S upper O subscript 2 (g).
Option A
B
2 upper H subscript 2 upper s (s) plus 3 upper 0 subscript 2 (g) right arrow 2 upper H subscript 2 upper O (l) plus 2 upper S upper 0 subscript 2 (g).
Option B
C
4 upper F e upper S subscript 2 plus 11 upper O subscript 2 right arrow 2 upper F e subscript 2 upper O subscript 3 plus 8 upper S upper O subscript 2.
Option C
D
2 upper S upper O subscript 2 (g) plus upper O subscript 2 (g) right arrow with upper V subscript 2 upper O subscript 5 above arrow 2 upper S upper O subscript 3 (g).
Option D
17

Which statement best relates an empirical formula with a molecular formula?

A
They are always different for the same compound.
B
Subscripts of empirical formulas can be reduced.
C
Molecular formulas can be determined from empirical formulas.
D
They both show the actual ratio of elements for a compound.
18

In which type of chemical reaction do two or more substances combine to form one substance?

A
synthesis
B
decomposition
C
single replacement
D
double replacement
19

Considering the activity series given for nonmetals, what is the result of the below reaction? Use the activity series provided. F > Cl > Br > IBr2 + NaF

Question illustration
A
no reaction
B
Na + FBr2
C
NaBr + F2
D
Na2F + Br2
20

What is the empirical formula for a compound if a sample contains 1.0 g of S and 1.5 g of O?

A
SO
B
SO3
C
S2O2
D
S2O3

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