AnswersFL-2003350-Chemistry 1 HonorsTypes of Reactions

Types of Reactions — Unit test Answers

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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
2
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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
3

Consider the chemical equation. 2NBr3 + 3NaOH N2 + 3NaBr + 3HOBrIf there are 40 mol of NBr3 and 48 mol of NaOH, what is the excess reactant?

Question illustration
A
N2
B
NBr3
C
NaOH
D
HOBr
4

An element has six valence electrons available for bonding. Which group of the periodic table does this element most likely belong to?

A
group 2
B
group 4
C
group 16
D
group 18
5

Which compound has the highest melting point?

A
Al2(CO3)3
B
C12H22O11
C
C8H18
D
H2O
6

Which statement best describes the effect of low ionization energies and low electronegativities on metallic bonding?

A
The valence electrons are easily delocalized.
B
The valence electrons stay in a single orbital.
C
The valence electrons break free of the crystals.
D
The valence electrons move closer to the nuclei.
7

Lewis structures cannot

A
show the number of valence electrons.
B
show the location of bonds.
C
show the strength of bonds.
D
show how many bonds are present in a molecule.
8

Which element is likely to be the most brittle?

A
selenium
B
cobalt
C
platinum
D
zinc
9

Consider the chemical equation.2H2 + O2 2H2OWhat is the percent yield of H2O if 87.0 g of H2O is produced by combining 95.0 g of O2 and 11.0 g of H2?Use .

Question illustration
A
56.5%
B
59.0%
C
88.5%
D
99.7%
10

Which of the following compounds would be expected to have the strongest ionic bonds?

A
the compound that has the largest ions with the greatest charge
B
the compound that has the largest ions with the least charge
C
the compound that has the smallest ions with the greatest charge
D
the compound that has the smallest ions with the least charge
11

How do ionic bonds affect the properties of ionic compounds?

A
The bonds weakly hold ions together, increasing the melting point.
B
The bonds strongly hold ions together, reducing the boiling point.
C
The bonds prevent ions from moving throughout the crystal, so a solid ionic compound is a poor conductor.
D
The bonds prevent electrons from moving throughout the crystal, so a solid ionic compound is a good conductor.
12

Which is the Lewis structure for H3PO4?

A
mc013-1.jpg
Option A
B
A central upper P is single bonded left, right, above, and below to upper Os. The O above the P is single bonded to upper H on the left and the right, and has two electron dots above it. The O below the P is single bonded to an H below, and has pairs of electron dots to the left and right.
Option B
C
A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.
Option C
D
A central upper P is bonded to an upper H above, an upper O below, and upper O's bonded to upper H's to the left and the right. The O below the P has three pairs of electron dots, to the left, right, and below; the other two O's have pairs of dots above and below. A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.
Option D
13

Based on its location in the periodic table, what can most likely be predicted about phosphorus?

A
It has three valence electrons.
B
It has four valence electrons.
C
It has five valence electrons.
D
It has six valence electrons.
14

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
15

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
16

Which statement best describes the properties of metals?

A
They are shiny and bend without breaking.
B
They are dull and are good electrical insulators.
C
They conduct electricity well and are brittle.
D
They can be flattened and do not conduct heat well.
17

Which statement is true about ionic compounds?

A
Solid ionic compounds are good conductors of electricity.
B
Ionic compounds have varying solubilities in water.
C
Ionic compounds have very low melting points.
D
Ionic compounds are very easy to bend.
18

The equation shows the reaction between zinc metal and hydrochloric acid.Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g)What is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?

Question illustration
A
5.05 g
B
10.1 g
C
182 g
D
682 g
19

Which reason best explains why metals are shiny?

A
because their valence electrons reflect light
B
because their valence electrons absorb light
C
because their valence electrons oscillate between bands
D
because their valence electrons move to higher energy levels
20

Which statement correctly describes the actual yield and the theoretical yield of a reaction?

A
The actual yield is calculated from the reactant amounts, but the theoretical yield must be measured for each instance of a reaction.
B
The actual yield is calculated from the amount of the limiting reactant, and the theoretical yield is calculated from the amount of the excess reactant.
C
The actual yield depends on the reaction conditions, but the theoretical yield varies only with reactant amounts.
D
The actual yield represents the maximum yield possible, and the theoretical yield assumes perfect reaction conditions.

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