CHE 107 exam 1 review
If a solution has a temperature of 255K, what is the temperature in degree celsius?
-18 ºc
The boiling point of liquid nitrogen is 77 K. What is the temperature on the Celsius scale?
-196ºC
Chart: Which number represents an element that is not classified as a main-group?
1
Which number represents a element classified as a transition metal?
1
The mass of a neutron is approximately which of the following?
1 amu
How many milligrams (mg) are there in 1 kilogram (kg)?
1 x 10^6
How many millimeters (mm) are there in 1 kilometer (km)?
1 x 10^6
The average distance between nitrogen and oxygen atoms is pm in a compound called nitric oxide. What is this distance in milimeters?[1 picometer= 1 x 10^-12 meter]
1.15 x 10^-7
The area of Africa is approximately11.7 million square miles. Which of the following is the correct way to express this number in scientific notation?
1.17 x 10^7
Given the calculation: 15.72/9.16=? what is the answer reported to the correct number of sigfigs?
1.72
Determine the density of an object that has a mass of 149.8 g and displaces 12.1 mL of water when placed in a graduated cylinder.
12.4 g/ml
Which of the following contains two species which are a pair of isotopes?
12C, 13C
A person weighs 77.1 kg. What is his weight in pounds?
170 pounds
Chart: Which number represents the element with the smallest number of protons?
2
Table: Which number represents an element classified as a metalloid?
2
Predict the charge that a calcium ion would have
2+
Given the calculation 17.712/7.610=?, what is the answer reported to the correct number of sig figs?
2.327
Because of the high heat and low humidity in the summer in Death Valley, California, a visitor requires about one quart of water for every two miles traveled on foot. Calculate the approximate number of liters required for a person to walk 10. kilometers in Death Valley.
2.9 L
How many valence electrons does an atom of Al posess?
3
Predict the charge that an aluminum ion would have
3+
The width, length, and height of a large, custom-made shipping crate are 1.22 m, 3.22 m, and 0.83 m, respectively. The volumeof the box using the correct number of significant figures is ______ m^3.
3.3
How many mm are in 3.20 cm?
3.30 x 10^1 mm
The outside temperature is 35ºC, what is the temperature in K?
308k
How many electrons can be accommodated in the fourth shell of an atom?
32
A common piece of laboratory glassware isa 125 ml beaker. What is the volume in the English system of units?[1 quart=0.946 liter= 32 fl oz]
4.23 fl oz
How many significant figures are in the measurement, 30.300 m?
5
How many electrons cane accommondated in the 4p subshell.
6
What is the metric length of the 100. yard dash? [i inch=2.54 cm (exactly)]
91.4 m
Which of the following statements describes a mixture?
A mixture does not contain a fixed ratio by mass of the component elements.
Atoms of which of the following elements are the smallest?
Al
Aluminum and fluorine form a compound in which the aluminum to flurine ratio is 1:3. What is the correct formula for this compound?
AlF3
What does "X" represent the following symbol? 80 on top 35 on bottom then X.
Bromine
Which of the following is the correct lewis dot picture of the carbon atom?
C with four dots.
Which of the following is not a proper symbol for an element?
CO
Which of the following elements is a lanthanide?
Ce
What elements defined by the following information? P+= 17 nº= 20 e-= 17
Chlorine
Define Kinetic energy.
Energy associated with the motion of an object.
Which of the following contains only nonmetals?
F, Cl, Br, I
Choose the element from the list below.
Helium
Which of the following is true of 1 gram sample of iron?
It contains a very, very huge number of atoms, each of which has an extremely tiny mass.
Which of the following is true of specific heat of water?
It is unusually high.
Which state of matter retains its volume but adapts its shape to that of its container?
Liquid
Which of the following is the correct Lewis dot picture of the nitrogen atom?
N with five dots
Sodium bicarbonate has sodium, hydrogen, carbon, and oxygen atoms in the ratio 1:1:1:3.What is the correct formula for sodium bicarbonate?
NaHCO3
which of the following is a metalloid?
Si
The law of conservation of energy states which of the following?
The sum of kinetic energy and potential energy is conserved.
Which of the following objects has the largest kinetic energy?
They all have the same kinetic energy.
Which of the following describes the compressibility of liquids?
They are slightly compressible.
Sodium is a highly reactive metal and chlorine is a toxic gas, but when they come together with the resulting material, sodium chloride, is essential for life. Which of thw following is true when sodium and chlorine and brought into contact with one another?
They form a compound.
Which of the following elements is an actinide?
U
Two or more substances in variable proportions, where the composition is variable throughout are
a heterogeneous mixture.
Distillation is
a process in which the more volatile liquid is boiled off.
Gold is an example of
an element
A substance that can't be chemically broken down into simpler substances is
an element.
Which of the following is synonymous with "fact"?
an observation which is reproducible.
Which of the following are examples of intensive properties?
density
Which of the following are examples of extensive properties?
density.
Which of the following are examples of physical change?
dew forms on a blade of grass
Ions differ in the number of
electrons
Zinc can be uniformly mixed in different amounts with copper to form an alloy called brass. Brass is an example of which of the following?
homogeneous mixture
Describe the reaction of the noble gases with metals.
inert
The Scientific Method
is based on continued observation and experiment.
What are the elements in the "A" columns of the periodic table called?
main group elements
Kilogram is a measure of
mass
The properties of ductility, malleability, ability to conduct heat and electricity are characteristics of what type of material?
metallic elements
The factor 10^-3 corresponds to which prefix?
milli
Isotopes differ in the number of.
neutrons
A chemical change
occurs when methane gas is burned.
Which of the following correctly describes an electron?
on the scale of subatomic particles, it is light and has a -1 charge
Which of the following correctly describes a proton?
on the scale of subatomic particles, it is massive and has a +1 charge.
Which subatomic particle(s) are found in the nucleus?
protons and neutrons
Which of the following represents a physical change?
stretching a silver wire.
The number of elements occur naturally as diatomic molecules under normal atmospheric conditions. Which of the following does not occur naturally as a diatomic molecule?
sulfur
The statement, "In a chemical reaction, matter is neither created nor destroyed" is called
the Law of Conservation of Mass.
Which of the following is an example of matter?
the air you breathe
Which of the following is the definition of the calorie?
the amount of heat required to heat 1.0 g of water by 1.0 ºC
Give the composition of water.
two hydogen atoms and one oxygen atom.
Molecules can be described as
two or more atoms chemically joined together.