AnswersChemistry 1A - Mr. KaanWriting and Balancing Chemical Equations

Writing and Balancing Chemical Equations — Cumulative exam Answers

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The MSDS for propane gives it a health rating of 1, a flammability rating of 4, and a reactivity rating of 0. According to the MSDS, which best describes propane?

A
highly corrosive
B
highly toxic
C
highly flammable
D
highly reactive
42
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Which statement correctly contrasts science and pseudoscience?

A
Science is objective, whereas pseudoscience is subjective.
B
Science lacks a process for collecting data, whereas pseudoscience relies on collecting data.
C
Pseudoscience is constantly updated, whereas science does not change based on new information.
D
Pseudoscience is published in academic journals, whereas science appears mostly on the Internet.
43

How did the development of the earliest idea about atoms differ from the later work of scientists?

A
It was based on sound evidence.
B
There were explanations for the idea.
C
It was based on the thoughts of an early philosopher.
D
There were experiments conducted to support the idea.
44

A Lewis electron structure of a molecule is shown. Judging by the electron domain geometry, which type of hybrid orbitals does this molecule have?

Question illustration
A
s
B
sp
C
sp2
D
sp3
45

What is the chemical symbol for magnesium?

A
Mo
B
Mn
C
Mg
D
Md
46

Which compound contains only a nonpolar covalent molecule?

A
O2
B
HCl
C
H2O
D
NO3
47

Which is the IUPAC name for NO?

A
nitric oxide
B
binitrogen oxide
C
dinitrogen dioxide
D
nitrogen monoxide
48

Which statement best describes the formula equation Cl2(g) + 2KBr(aq) 2KCl(aq)+ Br2(l)?

Question illustration
A
Carbon iodide reacts with potassium bromide to form potassium carbon iodide and bromine.
B
Bromine gas reacts with a solution of potassium chloride to form potassium bromide and chlorine gas.
C
Potassium bromine gas reacts with liquid chlorine to form potassium chloride in solution and bromine gas.
D
Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine.
49

Which procedure could a student use to examine an intensive property of a rectangular block of wood?

A
Find the mass.
B
Record the length.
C
Measure the volume.
D
Determine the density.
50

The chemical equation for the formation of ammonia is unbalanced.3H2(g) + N2(g) NH3(g)If three molecules of hydrogen react with one molecule of nitrogen, how many molecules of ammonia would be formed?

Question illustration
A
1
B
2
C
3
D
4
51

Which is the formula mass of Na2SO4?

A
119.06 amu
B
125.98 amu
C
142.05 amu
D
174.12 amu
52

What is the percent by mass of magnesium sulfate in MgSO4 · 7H2O?Use .

Question illustration
A
12.04%
B
48.83%
C
51.17%
D
86.98%
53

Which task most likely involves a calculation that uses moles?

A
measuring a sugar sample on a balance
B
counting the number of jellybeans in a jar
C
determining the number of atoms in a jar of liquid
D
finding the rate of expansion of a gas-filled balloon
54

What is the true ratio of atoms in a molecule or formula unit called?

A
the molecular formula
B
the molar mass
C
the percent composition
D
the empirical formula
55

To show the electron configuration for an atom, what is the advantage of using an orbital notation compared to a dot structure?

A
Orbital notation takes up less space.
B
Orbital notation shows the spin of the electrons.
C
Orbital notation makes it easier to count the electrons.
D
Orbital notation shows the electron distribution in shells.
56

The diagram shows Niels Bohr’s model of an atom. What happens when the electron moves from the first energy level to the second energy level?

Question illustration
A
Energy is absorbed, and an emission line is produced.
B
Energy is released, and an emission line is produced.
C
Energy is absorbed by the atom.
D
Energy is lost from the atom.
57

What is the ratio of ions needed to produce neutral potassium chloride?

A
one potassium ion to one chloride ion
B
two potassium ions to one chloride ion
C
one potassium ion to two chloride ions
D
two potassium ions to three chloride ions
58

Which is the formula for nitrogen trihydride?

A
NH3
B
N3H
C
3NH
D
N3H3
59

What name should be used for the ionic compound Co(SO)?

Question illustration
A
cobalt(III) sulfide
B
cobalt(III) sulfate
C
cobalt(III) trisulfide
D
cobalt(III) trisulfate
60

Which particle is J. J. Thomson credited with discovering?

A
electron
B
neutron
C
proton
D
photon

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