Midterm Flashcards
Which of the following is an example of qualitative data?
It has a rectangular shape.
A student surveys his classmates to find out their favorite fruits. The data below shows his findings.
Kind of Fruit Number of Students
Berries 8
Melons 3
Apples 4
Oranges 5
Which type of graph should be used for this data?
pie graph
What state of matter does this picture show?
solid
Suppose an oxygen tank has a pressure of 120 atm at a temperature of 25°C. If the temperature increases to 31°C, what will the final pressure of the oxygen tank be if the volume and amount of the oxygen are held constant?
122 atm
A chemical change refers to…
a change that produces a different type of matter.
If the temperature on a hot summer day measures 98 °F, what is the temperature in kelvin?
310 k
Four teams of students were given 19.5 mL of water and asked to obtain four measurements. Which set of measurements is most precise?
Team A Team B Team C Team D
19.1 mL 19.4 mL 19.5 mL 20.1 mL
18.4 mL 19.5 mL 19.7 mL 19.1 mL
19.7 mL 19.3 mL 18.9 mL 19.4 mL
20.3 mL 19.5 mL 19.1 mL 18.5 mL
Team B
The weight of a child was reported as 23.8 kg. What is this weight in pounds? Report your answer based on the rules of significant figures.
52.4 lb
The law of conservation of mass states that…
the total mass before the chemical reaction must equal the total mass after the chemical reaction.
How many electrons are in the following atom: _{7}^{15}\textrm{N}
7
Lithium exists in two naturally occurring isotopes. Use the information provided to calculate lithium’s average atomic mass.
Isotope Atomic mass Natural abundance
Lithium-6 6.0151 amu 7.59%
Lithium-7 7.0160 amu 92.41%
6.94 amu
Where are the transition metals located on the periodic table?
the middle of the table
The empirical formula of a molecule is CH and its molecular mass is 78.0g/mol. What is its molecular formula? (Hint: Molar mass of carbon is 12.0 g/mol and hydrogen is 1.0 g/mol.)
C6H6
Correctly predict the ionic compound that would form between the atoms rubidium (Rb) and oxygen (O).
Rb2O
What is the formula for the base beryllium hydroxide?
Be(OH)2
Calculate the frequency (in Hertz) of an x-ray with a wavelength of 9.0 x 10-8 meters.
3.3 x 1015 Hz
What is the energy of electromagnetic radiation with a wavelength of 7.6 x 10-7 meters?
2.6 x 10-19 J
Which of the following is not one of Bohr’s postulates?
The atomic emission spectrum for hydrogen shows four wavelengths of visible light.
The following picture represents which orbital shape?
p
Identify the correct order for the following orbitals in order of highest energy to lowest energy for a many-electron atom: 2p, 4s, 6d, 3d, 1s.
6d, 3d, 4s, 2p, 1s
What is the condensed electron configuration for phosphorus?
[Ne]3s23p3
The information and data taken from the experiment and carefully reviewed and compared to the hypothesis is the definition of which of the following terms?
conclusion
A visual representation of numerical data on both the x-axis and y-axis is the definition of which type of graph?
line graph
What classification of matter is a jar of sand and water?
a heterogeneous mixture
Which mixture could not be separated using distillation?
removing sand from rice
Which of the following is equivalent to 1,000,000 g?
1 Mg
Round 0.013849 to three significant figures.
0.0138
If your height is 66 inches, how many centimeters tall are you? Report your answer based on the rules of significant figures.
170 cm
Which proposed model of the atom included a small positively charged nucleus?
Rutherford’s model
What is the atomic number of the following chemical symbol: C presubscript 6 presuperscript 13 ?
6
Where are the radioactive elements located on the periodic table?
actinides
Which is an example of an empirical formula? (Select all that apply.)
CH2; CH3; C2O3
Within the ionic compound CaO, which atom or group of atoms is considered the anion?
O
What is the formula for hydroiodic acid?
HI (aq)
Which list correctly shows visible light in increasing energy?
red, orange, green, violet
__________ refers to the generic lab for observing light being emitted from excited electrons within an atom.
A flame test
The two quantum numbers for electron spin are…
-½ , and +½.
How many valence electrons does carbon have? Carbon’s electron configuration is 1s22s22p2.
4
Using the five senses to collect information about the world is the definition of which of the following?
observation
Which measurement has the least amount of uncertainty?
3.123 L
What is the standard notation value of 7.221 x 10-4?
0.0007221
__________ is the total number of protons and neutrons in an atom.
mass number
Which is an example of a molecular formula?
C4H6O2
Within the ionic compound NaCO3, which atom or group of atoms is considered the cation?
Na
What is the charge of the cation in K3N?
+1
Which of the following provides the best explanation for the photoelectric effect?
When light of a certain frequency is shined on a clean metal surface, electrons are emitted from the surface.
Line spectra observed through gaseous elements in a glass tube being sent energy in the form of electricity is…
an atomic emission spectrum.
What specific orbital aligns with the following quantum numbers?
n=2
l = 0
ml = 0
2s
The Pauli exclusion principle states that no __________ electrons can have the same set of __________ quantum numbers.
2;4
Fluorine has __________ paired electron(s) and __________ unpaired electron(s) in the 2p subshell.
2;1
If heat energy were removed from a glass of juice, what would happen?
it would turn to a solid
Increased activity of molecules results in __________ force. This is due to the proportionality of __________ and pressure.
greater; temperature
There are variations in the numbers between what was actually poured and what was measured. What is the most reasonable explanation for this?
There are levels of uncertainty.
The number 7,899, expressed using scientific notation, is…
7.899 x 103
You need to figure out the density of an object. The volume is 48 mL and the mass is 8.0 g. What is the density?
170kg/cubic meter or 0.170g/mL
You have decided to paint one level of your house. It will take 4 gallons of paint to complete the job. How many liters of paint will you need?
15.16 L
In preparation for a marathon, you jog 6 miles per day. Convert your daily distance to kilometers.
9.66 km
In order for an atom to be neutral, it should have an equal number of __________ and __________.
protons; electrons
A helium atom with 2 protons and 4 electrons will have a net charge of…
-2
Carbon has three naturally occurring isotopes: Carbon-12, Carbon-13, and Carbon-14. What do the different numbers of each isotope represent a combination of? (Choose all that apply.)
neutrons; protons
Calcium has an atomic number of 20 on the periodic table. How many neutrons does a Calcium-48 isotope have?
28
Which of the following is not a step in the scientific method?
elimination
You notice that you tend to be more productive with work in the morning rather than the evening. You think that if you were to wake up an hour earlier, all of your work would be done before evening. According to the scientific method, what is the next step in this process?
test hypothesis
The exact whole number that represents the elements in a compound is called __________. The simplest whole number ratio of the elements in a compound is called __________.
molecular formula; empirical formula
If you have a wavelength of 487nm of K2CrO4, potassium chromate, with an absorbance of 0.02 and a concentration of 130 μM, what would happen to the absorbance rate if the volume of the identical solution increased in a container with a larger capacity?
The absorbance rate would increase.
