1.1 Chemistry in context Read Online
1.2 Phases and classification of matter Read Online
1.3 Physical and chemical properties Read Online
1.5 Measurement uncertainty, accuracy, and precision Read Online
1.6 Mathematical treatment of measurement results Read Online
Your alarm goes off and, after hitting “snooze” once or twice, you pry yourself out of bed. You make a cup of coffee to help you get going, and then you shower, get dressed, eat breakfast, and check your phone for messages. On your way to school, you stop to fill your car’s gas tank, almost making you late for the first day of chemistry class. As you find a seat in the classroom, you read the question projected on the screen: “Welcome to class! Why should we study chemistry?”
Do you have an answer? You may be studying chemistry because it fulfills an academic requirement, but if you consider your daily activities, you might find chemistry interesting for other reasons. Most everything you do and encounter during your day involves chemistry. Making coffee, cooking eggs, and toasting bread involve chemistry. The products you use—like soap and shampoo, the fabrics you wear, the electronics that keep you connected to your world, the gasoline that propels your car—all of these and more involve chemical substances and processes. Whether you are aware or not, chemistry is part of your everyday world. In this course, you will learn many of the essential principles underlying the chemistry of modern-day life.
Question: Which of the ions listed below has the smallest radius? (Not sure of the correct answer)
Choices:
Li+
Na+
O^2-
Cl-
Ca2+
Question: When the following equation is balanced, the coefficient of oxygen is _____. __C4H10 (g) + ___O2 (g) ? ___CO2 (g) + ___H2O (l)\
Choices:
1
4
8
13
6
Question: Calculate the mass of ammonium nitrate that must be heated to generated 10.0 g N2O according to the following balanced chemical equation: NH4NO3 (s) ? N2O (g) + 2 H2O (l)
Choices:
18.2 grams
0.227 grams
9.10 grams
80.1 grams
44.0 grams
Question: Which of the following is an example of a physical property?
Choices:
temperature
corrosiveness
flammability
combustibility
both b and c
Question: A 250-ml stoppered flask contains a substance that occupies 25.0 mL. Which of the following statements is TRUE about the substance in the flask? (Not sure of the correct answer)
Choices:
The substance CANNOT be a solid
The substance CAN ONLY be a liquid
The substance CAN ONLY be a gas
The substance CANNOT be a gas
The substance CAN ONLY be a liquid
Question: Which of the following NOT isoelectronic with the others? (not sure of the correct answer)
Choices:
oxide ion
fluoride ion
sodium ion
magnesium ion
calcium ion
Question: Calculate the molarity of a 2.00L solution of glucose (C6H12O6) which contains 50.0 grams of glucose. ( Don't have the correct answer for this problem yet.)
Choices:
180. M
3.60M
0.139M
0.277M
7.22M
Question: The value of \Delta?Ho for the reaction below is -126 kJ. _________ kJ are released when 2.00 mol of NaOH is formed in the reaction. 2Na2O2 (s) + 2H2O (l) ? 4NaOH (s) + O2 (g) (don't have correct answer for yet)
Choices:
-3.9 kJ
-7.8 kJ
-126 kJ
-252 kJ
-63 kJ
Question: Which of the following is the highest temperature?
Choices:
96oF
302 K
38oC
the freezing point of water
Question: The change in the internal energy of a system that absorbs 2,500 J of heat and that does 7,655 J of work on the surrounding is ______J
Choices:
-5,155
1.91 x 10^7
5,155
10,155
-10,155
Question: Which of the following substances would be classified as a homogeneous solution?
Choices:
water
copper wire
concrete
soft drink
sodium chloride
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