Chemistry Homework - Concepts of Atoms, Bonding, and Reactions

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Added on 2022/09/16

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This chemistry homework assignment covers fundamental concepts in chemistry, including subatomic particles, atomic structure, and chemical bonding. The assignment presents multiple-choice questions that assess understanding of protons, neutrons, electrons, and their charges. It explores significant figures, the octet rule, and the properties of elements in the p-block. The assignment also delves into ionic and covalent bonding, electronegativity, atomic size, and electron configurations. Furthermore, it examines the differences between mixtures and compounds, and the revisions made to Dalton's atomic theory. The homework assesses knowledge of physical and chemical changes, balancing chemical equations, and identifying reaction types like combustion and decomposition. Finally, it includes questions about the naming of chemical compounds and the identification of catalysts. The assignment is designed to reinforce key concepts in introductory chemistry.

Subatomic particles
that have a positive
charge are:
Answer: neutrons
protons
electrons
quarks
Which of the following has the same number of significant
figures?
Answer: 101.0 g, 22.45 g,
1111g
0.0001 g, 1000 g,
1.0 x 103 g
3003 g, 88 g,
0.022 g
999 g, 3.13 g,
0.10 g
Bondingoccursdueto
Answer: the Pauli exclusionprinciple.
Hund's rule.
thelaw of conservation.
theOctet rule.
Elements located in the p
block:
Answer: are made up of metals, nonmetals, and metalloids.
are made up of elements that are solid, liquid and gases at
room temperature.
areallnonmetals.
both a & b.
When a metal and a nonmetal bond, the result is a(n) ______.

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Answer: metalliccompound
covalentcompound
ioniccompound
Which element below would have the highest electronegativity
value?
Answer: barium
lead
sodium
fluorine
Which element
below would have
the highest atomic
size?
Answer: barium
oxygen
sodium
fluorine
The symbol for carbon is
___.
Answer: C
Ca
Co
Cu
The electron configuration
for potassium is ____.
Answer: 1s22s22p23s23p34s1
1s22s23s23p63d7

[Ar]4s1
[Kr]3s23p3
When two elements share electrons, this is known as ____.
Answer: covalentbonding
ionicbonding
metallicbonding
How is a mixture different from a compound?
Answer: A mixture is a man-made substance, while a compound is a naturally
occurring substance.
A mixture can contain many elements, but a compound can only contain
two elements.
A mixture can always be seperated into its parts with a magnets, but heat
must be applied before a compound can be separated.
A mixture can be separated into its parts through physical action, but a
compound can only be separated into its parts by a chemical action.
In the early 1800s, John Dalton formulated his Atomic
Theory. Later experiments caused important revisions to be
made. Of Dalton''s statements below, which one had to be
changed to reflect new evidence of the atomic stucture of
matter?
Answer: Atoms of different elements can physically mix together.
All elements are composed of submicroscopic indivisible
particles called atoms.
Atoms of different elements can chemically combine
with one another in simple whole-number ratios to form
compounds.
Atoms of any one element are different from those of
any other element.

Select the correct statement about subatmoic particles:
Answer: The mass of a neutron nearly equals the mass of a proton.
Electrons, protons, and neutrons have roughly the same
mass.
Protons are positively charged and are the lightest weight
particle.
Neutrons have no net charge and are the lightest weight
particle.
Which of the following
shows correctly an ion pair,
and the ionic compound they
would form?
Answer: Sn+4 and N-1; Sn4N
Cr+3 and I-1; CrI
Li+1 and O-2; LiO2
Au+1 and S-2; Au2S
Which of the following sets
of names and formulas is
incorrect?
Answer: strontiumiodide, SrI2
oxygendifluoride, OF2
calciumhydroxide, Ca(OH)2
potassiumphosphate, K3PO3
Which of the following is
a physical change?
Answer: milksouring
eggsfrying
ironrusting
ice melting
Atoms, which contain
charged particles, are still

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neutral. This can be best
explained by the fact that:
Answer: the have more neutrons than electrons and protons
they have equal numbers of protons and electrons
atoms constantly discharge their charges.
the electron charge is so tiny that it does not effect the
atom.
The respiration equation C6H12O6 + O2 -----> CO2 + H2O is an
example of a ____ reaction.
Answer: combustion
decomposition
single
replacement
doublereplace
ment
synthesis
What is the correct
name for FePO4?
Answer: ironphosphate
iron (I)
phosphate
iron (II)
phosphate
iron (III)
phosphate
Which of the following speeds up
a reaction without being used up?
Answer: products

reactants
catalyst
aqueous
You place two chemicals in a test tube and observe
the following. Which indicates that a chemical
reaction (chemical change) has taken place?
Answer: bubblesform
the test tube gets hot
a precipitateforms
all of theabove
Which state of matter always has a definite shape and
a definite volume?
Answer: solid
liquid
gas
plasma
When the equation, Fe + O2 ----> Fe2O3, is
balanced, the coefficient for oxygen is ___.
Answer: 1
2
3
4
References:
Mies, F. H. (1981). Quantum Theory of Atomic Collisions in Intense Laser Fields. Theoretical
Chemistry,127-198. doi:10.1016/b978-0-12-681907-6.50008-2
Irimia R, Gottschling M (2016) Taxonomic revision of Rochefortia Sw. (Ehretiaceae, Boraginales).
Biodiversity Data Journal 4: E7720. https://doi.org/10.3897/BDJ.4.e7720. (n.d.).
doi:10.3897/bdj.4.e7720.figure2f

Ball, D. W., & Key, J. A. (2014, September 16). Introductory Chemistry – 1st Canadian Edition.
Retrieved from https://opentextbc.ca/introductorychemistry/chapter/ions-and-ionic-compounds-
2/