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
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
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 /
Laboratory Techniques and Measurements
Exercise 1: Length, Temperature, and Mass
Data Table 1. Length Measurements.
Object
Length (cm)
Length (mm)
Length (m)
CD or DVD
Key
Spoon
Fork
Data Table 2. Temperature Measurements.
Water
Hot from tap
Boiling
Boili
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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
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
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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
2e
1) An orbit is a fixed path around a heavy object on which a lighter object moves due to a
gravitational force or electromagnetic force while an orbital is an uncertain area around the
nucleus of an atom in which the probability of finding an electron
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?
2. If a block has a dimension of 5cm X 10cm X 30cm, what is its volume? If the mass is
500mg, what is its density in g/cc?
3. Alumin
CHE 101 McClure Acids & Bases, 9H Homework 7A
1. Give definitions for the following: acid, base, strong acid, weak acid.
Add A Subsmm- 04: tyroauces W Ions Do 0. saintam),
BO'OQJ F7 Substance. mi Produces DH' fans IN C SOIWIM.
i
5%on ilclvii Is Hikhi Imam
5. Calculate the fractional pH for the solutions with the following hydrogen ion concentrations:
_."66 ., r '
a) 2.2 (10-2)M a (OjCOoOZZ) 1 H4": )0 3 PH l-EQ h? ClolC
-5?
'5 m
" fall-
b) 4.5 (10)Ma L03 (0.000%) r. H: )0 _ 3 PH 335' a A "'
0) 5-8l10J5)M_ ,
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
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
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
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
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
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
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
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).
(4.0 g NaHCO) / (6L H2O) =0.667 g/L (4 g NaHCO) / (60 dL H20) =0.67 g/dL or 0
TEST BANK / CHAPTER 5
Multiple-Choice
1.
Anthropologists rely on fieldwork to
a.
b.
c
d.
ANS:
PG:
describe and explain diverse cultures.
study how people think rather than how they behave.
avoiding having to test hypotheses.
all of the above
A
89
2.
Anthr
TEST BANK / CHAPTER 5
Multiple-Choice
8.
What are the methodological advantages of photography?
ANS: allows us to see without fatigue, not selective - captures everything in any particular
frame, easier and less time-consuming mode of data collection than
302 Mid eld
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
_._- LOCJOCL
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
CHE 101 McClure Densit
josh Mumsenl
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 ; _ :