CHE 101 McClure
Mole & Gram Conversions
Homework 4B
1. Indicate the significance of Avogadros number.
Avagadro's number allows you to calculate how many molecules are in a mole of a substance or vice versa.
Avogadro's number is an absolute number: there a
Dung Nguyen
CHE 101 McClure
Density
Homework 1E
1. If an object weighs 50 grams and has a volume of 30cc, what is its density in g/mL?
Density is the ration of mass to the volume.
Density = mass / volume
First change cc into mL as follows:
30cc *1.0 mL /
CHE 101 McClure
Mole & Mass Ratios
Homework 4C
In the following problems, use the balanced equation to calculate how many grams of
various chemicals in the equation are needed or produced, given either the number of moles
or the number of grams of one che
CHE 101 McClure
Activity Series
Homework 5A
1. Given that the following reactions occur, rank the elements Li, K, Ca, and Ba in an activity
series from highest to lowest.
2 K + BaCl2
2 KCl + Ba
Li + KCl
LiCl + K
Ba + CaCl2
BaCl2 + Ca
Lowest to highest: Ca
CHE 101 McClure
Activity Series
Homework 5B
1. Given the following facts:
Mg(+2) reacts with HCl to form magnesium chloride and H2 gas.
Mg + 2 HCl = MgCl2 + H2
Ga(+3) reacts with HCl to form gallium chloride and H2 gas.
2 Ga + 6 HCl = 2 GaCl3 + 3 H2 (gas)
CHE 101 McClure
Concentration
Homework 6A
1. If 4.0g of NaHCO are dissolved in 6 L of water, calculate the concentration in g/L, g/dL, %,
mg/dL, mg%, M (mol/L) and mM (mmol/L).
0.5L x 10dL/L = 5 dL H2O
20g/5dL = 4g/dL or 4%
4g/dL x 1000mg/g = 4000 mg/dL o
1. Activation Energy is the amount of energy required to get the reaction started.
Exothermic reaction is a chemical reaction that releases energy by light or heat. It is the opposite
of an endothermic reaction.
Endothermic: if the energy required to brea
Dung Nguyen
CHE 101 McClure
1.
Conversions
Homework 1B
Fill in the blanks:
1.27
50 in = _ meters
51.1811
1.3 m = _ inches
2. If a stick is 50 cm long, what is its length in meters? Millimeters? Decimeters?
Micrometers?
meters: 0.5
millimeters: 500
decimet
Dung Nguyen
CHE 101 McClure
Area
Homework 1C
1. A square is 10 inches on each side. Calculate the area in in2, mm2, and cm2.
100 sq. in, 64516 sq.mm, 645.16 cm2
2. A square is 50 cm on each side. Calculate the area in cm2, m2, and in in2.
2500cm2, 0.25sq.
Dung Nguyen
CHE 101 McClure
Volume
Homework 1D
1. A cube is 10 inches on each side. Calculate its volume in m3, cm3, and dm3
100sq.in = 1000 cubic inch
answers: 0.0163871 cubic meter, 16387.1 cubic cm, 16.3871 cubic dm
2. A cube is 15cm each on each side.
Dung Nguyen
CHE 101 McClure
Calorie Problems
Homework 1F
1. If you heat 50mL of water from 25C to 70C, how many calories are required? How many
kilocalories is that?
Use q = mCpdT
density of water = 1 g/ml
So, 50 ml = 50 g
q = 50 x 4.18 x (70-25) = 9405 J
CHE 101 McClure
Periodic Table
Homework 2A
1. What do the rows or periods on the periodic table represent?
Rows of elements are called periods. The number row an element is in,
corresponds to how many shells it has.
2. What information does the group A nu
CHE 101 McClure
Atomic Structure
Homework 2B
1. Define the three subatomic particles of an atom, including charge, location, and importance.
Charge
Proton:
Neutron:
Electron:
Location
in the nucleus
in the nucleus
outside nucleus
+1
0
-1
Importance
identi
Name
Ammonium Ion
Hydrogen Carbonate ion
Hydrogen Sulfate Ion
Nitrite Ion
Nitrate Ion
Cyanide Ion
Hydroxide Ion
Dihydrogen Phosphate Ion
Carbonate Ion
Sulfate Ion
Monohydrogen Phosphate Ion
Phosphate Ion
Formula
NH4
HCO3
HSO4
NO2
NO3
CN
OH
H2PO4
CO3
SO4
H
Dung Nguyen
1. Describe the difference between an orbit and an orbital. What are the 4 types of orbitals?
- An orbit is a fixed path around a heavy object on which a lighter object moves due to
gravitational forces or electromagnetic forces while an orbit
CHE 101 McClure
Isotopes
Homework 2C
1. Why are atomic masses on the periodic table not whole numbers?
Because thereare different isotopes of the elements.The atomic weight is the average based
on the proportions that they occur in naturally
2.
Research o
CHE 101 McClure Electron Con uration Homework 2F
1. Give the electron conguration for the following atoms using a box orbital diagram:
Li, B, Ni, Ar, As, Zn
. i :
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cfw_HE 101 McClure lsotoges Homework 2C
._. Whv are atomic masses on the periodic tabie not whole numbers?
Because $OMPL95 Of- qH elemh have. reo+op35;(m0M, o oi
60mg elemN-i they;- have. 50m atom/.1955 00!- olfitrm. imam
Maa) m Qka, ma i5 C
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Encetrlofeccx
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CHE 101 McClure Heisenberg Homework 2E
1.
2.
3.
Describe the difference between an orbit and an orbital. What are the 4 types of
orbitals?
Debi-\- 15 0~ cued. Perk cw electron: travel
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one. [0\
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CHE 101 McClure Calorie Problems Homework 1F
Wlt
v
1. If you heat 50mL of water from 25C to 70C, how many calories are required? How many l le-lpz ISHZO
kilocalories is that? (in H5 C, m =
CHE 101 McClure Area Homework 1C
1. A square is 10 inches on each side. Calculate the area in i112, mmz, and cmz. ' \
11M : 25 Li m M
l~=?.'5'-lcr/\
- Sam) M
A Law m
ID
2. A square is 50 cm on each side. Calculate the area in cmz, m2, and in in2. 1
43(60m
CHE - l0!
CHE 101 McClure Volume Homework ID
1. A cube is 10 inches on each side. Calculate its volume in ma, cm3, and dm3 _ l link: 2451' 0"
E .OZSlM
'6 _
Vmg : lOK .OZ'Sle) 2 loGLl xlO 1mg
2: .259 elm
Vat : (luv 2.5%,.)33 11953740 m3
Van? ._ (to
CHE 101 McClure Conversions Homework 13
1. Fill in the blanks:
i 60'
50in = L?) meters 31153;? x )4; rial-101
Bio? inches EJx 5% E Shit in)
M
1.3m
2. If a stick is 50 cm long. what is its length in meters? Millimeters? Decimeters?
Micrometers? Base to 6
CHE 101 McClure Densit
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CHE ~ not
Homework 1E
1. If an object weighs 50 grams and has a volume of 300C, what is its density in glmL? 0 : v
2. If a block has a dimension of Scm X 100m X 30cm, what is its volume? If the mass is Fawn/13 ; _ :
Clash Mieleru
CHE 101 McClure Periodic Table Homework 2A
1. What do the rows or periods on the periodic table represent?
[Aiken Mourns LoH to ligi-y-l- at- C1 ran, the, Number 0c Valor-JUL 9,195,319,;
Emerita-.555. cfw_vi-laid Moldy-'3 down the. rows of t
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CHE 101 McClure Atomic Structure Homework ZB
1. Define the three subatomic particles of an atom including charge, location, and importance.
PLLWH' . Lanceea panKm) cht/ Modems;
09. the. oJ'om. 4" charge; EMVorl-an-cheMHH
Neutron 1
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CHE 101 McClure
Mole & Gram Conversions
Homework 4B
1. Indicate the significance of Avogadros number.
2. Describe the relationship between a mole of a substance and Avogadros number.
3. What is the mass of one mole of the following: potassium, lithium, an
CHE 101 McClure
Exothermic & Endothermic
Homework 4D
1. Explain the meaning of the following terms: activation energy, exothermic, endothermic, reversible
reaction, irreversible reaction, and catalyst.
ACTIVATION ENERGY: Is the amount of energy required t
CHE 101 McClure
Mole & Mass Ratios
Homework 4C
In the following problems, use the balanced equation to calculate how many grams of
various chemicals in the equation are needed or produced, given either the number of moles
or the number of grams of one che
Bulls "mag well oleFmed Palm 0' 09bit: *3 Dillkrwi Mrjll levels minim and Mom cm; ONlf-C0U'l-ohu
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CHE 101 McClure Bohr's Model Homework ZD
1. Give the electron configuration for the followi