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WorksheetsAdvanced Chemistry Benchmark
Total questions: 30
Worksheet time: 8hrs 30mins
In the following list, only ___ is an example of a chemical change.
butter melting
an egg frying
a tire inflating with air
water evaporating
When table salt (NaCl) is placed in water (H2O), the resulting substance looks the same throughout. NaCl + H2O is an example of which type of matter?
Compound
Element
Heterogenous mixture
Homogenous mixture
Atoms carry no charge because they ___.
have an equal number of electrons and protons.
have an equal number of neutrons and electrons.
have an equal number of protons and neutrons.
have neutrons in their nuclei.
Oxygen’s atomic number is 8. This means that an oxygen atom has ___.
8 neutrons in its nucleus.
8 protons in its nucleus.
a total of 8 protons and neutrons.
a total of 8 neutrons and electrons.
Which statement about an element’s relative atomic mass is correct?
It is based on an isotope’s charge, so negatively charged ones have a greater effect than positive ones.
It is determined by counting the number of isotopes in a sample of the element.
It is equal to one-twelfth the mass of the most common isotope.
It is a weighted average, so common isotopes have a greater effect than uncommon ones.
I do not know
Light behaves as both a(n) ___ and a(n) ___.
gas and particle
wavelength and matter
wave and particle
spectrum and frequency
If the wavelength of light emitted by the hydrogen atom at 486 nm were to increase to 656 nm, what would happen to the frequency of the light?
Frequency will decrease
Frequency will increase
Frequency will stay the same
Frequency and wavelength are not related
During a flame test, a lithium salt produces a characteristic red flame. This red color is produced when electrons in excited lithium atoms ___.
are lost by the atoms
are gained by the atoms
return to lower energy states
return to higher energy states within the atoms
On the modern periodic table, the elements are arranged in order of increasing ___.
energy level
atomic number
neutron number
valence number
As the elements are considered from the top to the bottom of Group 15, which sequence in properties occurs?
nonmetal → metalloid → metal
metal → nonmetal → metalloid
metal → metalloid → nonmetal
metalloid → metal → nonmetal
As the elements of Period 2 are considered in succession from left to right, there is a general decrease in ___.
nonmetallic character
metallic character
ionization energy
electronegativity
Which trends are observed when the elements in Period 3 on the periodic table are considered in order of increasing atomic number?
The atomic radius increases and the ionization energy generally decreases
The atomic radius increases and the ionization energy generally increases
The atomic radius decreases and the ionization energy generally decreases
The atomic radius decreases and the ionization energy generally increases
What is the correct chemical name for Al2O3?
dialuminum trioxide
aluminum oxide
aluminum oxygen
alumina
Which of the following chemical equations are correctly balanced?
4 P + 5 O2 → 2 P2O5
AgNO3 + 2 Cu → 2 Cu(NO3)2 + Ag
H2O + O2 → H2O2
Ag2O → 2 Ag + O2
I do not know
Predict the product(s) of the chemical reaction from the given reactants:
Na + Cl2 → ?
NaCl2
NaCl
2 Na + Cl
Na + 2 Cl
I do not know
What is the molar mass of barium iodide?
126 grams
137 grams
256 grams
391 grams
I do not know
The decomposition of 25.0 g of calcium hydroxide, Ca(OH)2, in the lab produces 13.5 g of calcium, 10.8g of oxygen, and 0.68 g of hydrogen. What is the percent composition of calcium in this sample of calcium hydroxide.
2.27%
43.2%
54.0%
99.92%
I do not know
A student is trying to figure out how many moles of potassium chloride are made from 4.0 grams of
chlorine gas. Which step in the student’s work above is incorrect?
Step 1
Step 2
Step 3
There is no mistake
I do not know
In order to to determine the limiting reactant in a particular reaction, one must know each of the following EXCEPT...
the coefficient of each reactant in a balanced equation
the molar mass of each reactant present
the mass of each product formed
the mass of each reactant present
I do not know
Which of the following statements is true?
In an endothermic process heat is transferred from the surroundings to the system.
In an exothermic process heat is transferred from the surroundings to the system
The surroundings will feel cooler in an exothermic process.
The surroundings will feel warmer in an endothermic process.
I do not know
The minimum energy required to transform reactants into an activated complex is called
Activation energy
Kinetic energy
Potential energy
Heat energy
I do not know
A gas sample is confined in a 5-liter container. Which of the following will occur if the temperature of the container is increased?
I. The kinetic energy of the gas will increase.
II. The pressure of the gas will increase
III. The density of the gas will increase.
I only
II only
I and II only
I and III only
I do not know
For an ideal gas, which pair of variables are inversely proportional to each other (if all other factors remain constant)?
P, V
P, T
V, T
n, P
I do not know
Which one of the following statements is TRUE?
Increasing the pressure on a gas usually decreases its volume.
Doubling the pressure on a liquid will halve its volume.
Increasing the pressure on a solid will decrease its mass.
Decreasing the pressure on a solid significantly reduces its volume.
I do not know.
Which of the following is a property of an acid?
Does not react with metals
Feels slippery
Tastes sour
Turns red litmus paper blue
I do not know
In the following reaction, which compound is consider a salt?
H2SO4 + 2 KOH → K2SO4 + 2 H2O
H2SO4
KOH
K2SO4
H2O
I do not know
In the following reaction, which compound is consider an acid??
H2SO4 + 2 KOH → K2SO4 + 2 H2O
H2SO4
KOH
K2SO4
H2O
I do not know
A(n) ___ is a laboratory method for determining the concentration of an unknown acid or base.
acid-base reaction
indicator
neutralization
titration
Which pH indicates a basic solution?
1
2
7
10
I do not know
The following reaction can best be classified as a(n) ___ reaction.
HCl + LiOH → LiCl + H2O
decomposition
neutralization
oxidation-reduction
synthesis
I do not know
