WorksheetsLast
Total questions: 60
Worksheet time: 30mins
A Chemical Reaction is a Process in Which New Substance(s) are formed from a starting substance.
True
False
Which is the Correct Chemical Symbol for Carbon
Cn
Ca
Cr
C
All of the following are common properties of metals except
being able to form alloys
malleable
ductile
brittle
Which event must always happen for a chemical reaction to occur
effective collisions between reactants
a catalyst must be added
a gas must be formed
a precipitate must be formed
Rutherford's model of the atom differs from Thompsons Model in that
it has electrons
it has a large dense negatively charged nucleus
a small positively charged nucleus
one of them have no nucleus
Which Orbital Represents a Noble Gas
A
B
C
D
What is the maximum number of electrons that can ocuppy the 1s sublevel?
2
8
6
1
what is the total number of sublevels found in the fourth principal energy level?
4
3
2
1
The smallest particle of matter with unique properties is called an
atom
molecule
formula unit
ion
Which substance represents a compound
C
O2
Co
CO2
What is the name of NO3-
Nitrate
Nitrogen Oxide Gas
Nitrite ion
Nitride ion
Arsenic and Silicon are similar in that they both
are transition metals
have the same covalent radius
have the same ionization energy
are metalloids
How is an element classified if it has a partially filled d sublevel in the ground state
as a transition metal
as an alkali metal
as a halogen
as an alkaline earth metal
All of the following are pressure units except
boyle's
atm
torr
mmHg
Pascals
What do the coefficients tell about the ratio of the reactants
2H2 + O2---->2H2O
1:2
3:2
4:2
2:1
In a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is defined as the
heat of vaporization
heat of reaction
activation energy
ionization energy
Which is an Arrhenius base
NaOH
NH3
NC1
NaCl
For a given chemical reaction, if the reaction occurs without any outside intervention it would be classified as:
non-spontaneous
spontaneous
synthesis
single replacement
a
b
c
d
The gene-chromosome theory was proposed in 1930. The theory was based on other experimental results using fruit flies. Which statement best describes the term theory as used in the gene-chromosome theory?
A theory is never revised as new scientific evidence is presented
A theory refers to a scientific explanation that is strongly supported by a variety of experimental data.
A theory is a hypothesis that has been supported by one experiment performed by two or more scientists
A theory is an assumption made by scientists and implies a lack of certainty
The graph shows a heating-cooling curve for a substance. At point B the substance is solid. At point D the substance is liquid. During which segment is the substance melting?
D and E
C and D
A and B
B and C
Which Statement must be true for any chemical reaction at equilibrium?
The concentration of the products is less than the concentration of the reactants
The concentration of the products and the concentration of the reactants are constant
The concentration of the products and the concentration of the reactants are unequal
The concentration of the products is greater than the concentration of the reactants
A sample of silver metal has a mass of 144 g and a density of 10.5 g/cm3. What is the volume of the silver sample?
1,500 cm3
15.8 cm3
13.7 cm3
0.073 cm3
Fluorine is Classified as a group 7A (17) nonmetal. The fluoride ion is most likely expected to have a charge of
+7
-1
+1
-7
The elements Na (sodium) and Li (lithium) have similar chemical properties because they both have the same...
Mass Number
Number of valence electrons
Number of completely filled sublevels
atomic number
The kinetic Molecular theory assumes that the particles of gas:
are arranged in a regular geometric pattern
have collisions that result in the system losing energy
are in random, constant, strait line motion
have strong attractive forces between them
What is the standard (IUPAC) name for FeS
Iron (II) sulfate
iron (III) sulfide
iron (II) sulfide
iron (II) sulfate
What happens to the particles of a substance if the temperature decreases?
The avg. Kinetic energy of the particles remain the same.
The total kinetic energy of the particles increase
The particles motion will increase
The avg kinetic energy of the particles decreases
Lowering the temperature of a reacting system decreases the rate of reaction by lowering the kinetic energy of the particles in the system.
true
false
In a fusion reaction, reacting nuclei must collide. Why are collisions between nuclei difficult to achieve?
Nuclei are oppositely charged and attract each other
Nuclei are are positively charged and repel each other
Nuclei are negatively charged and repel each other
nuclei are oppositely charged and repel each other
Water has a gram molecular mass of 18.0 g/mol how many grams of water would be contained in 2.50 mol of water
0.139 g
45.0 g
2.50 g
7.20 g
given the following chemical equation which number would appear in front of H2 In the balanced chemical equation?
1
2
3
4
The temperature at which the forces holding its crystal lattice together are broken and it becomes liquid
heat of fusion
melting point
boiling point
heat of vaporization
The substance(s) that enter(s) a chemical reaction is (are) defined as the
products
recatants
coefficients
catalysts
The law of conservation of energy states that energy CAN be created and destroyed.
True
False
Which element K (potassium) or Ca (calcium) has a larger atomic radius
The radius of Potassium is smaller due to its larger nuclear charge
The radius of potassium is larger due to its larger nuclear charge
The radius of potassium is larger than calcium
The radius of the potassium atom is smaller than the calcium
The diffusion of two gases throughout a classroom is a chemical process (reaction)
true
false
Scientists make and test hypotheses as part of their normal activities. Some experimental results support the hypothesis, while others do not support it. Why do scientists consider any hypothesis valuable?
A hypothesis requires no further investigation if it is supported by the experiment
A hypothesis can be used to explain conclusions even if it is not supported by the experiment
A hypothesis requires no further investigation
A hypothesis may lead to further investigation even if it is not supported by the experiment.
Mendeleev is best known for his work with the periodic table. he used the table to predict the existence of a new element with characteristics similar to silicon. Years later, the predicted element was discovered in Germany. The new element had almost all of the properties predicted by Mendeleev. The fact that the predicted element was found at a later time by other researchers shows that:
Most scientists have biases that must be overcome prior to conducting studies
Theories must often be discarded by other scientists
Often the change in Scientific information occurs as small modifications of existing knowledge
Scientific ideas that do not match with those of the existing scientific community are often rejected
For a given amount of a specific substance, the energy required to melt the substance and the energy required to freeze the substance:
are unequal un magnitude, but opposite in sign
are unequal in magnitude and alike in sign
are equal in magnitude and alike in sign
are equal in magnitude but opposite in sign
Which attractive force Between particles is considered to be the weakest
Polar covalent Bond
London Dispersion Forces (LDF)
Hydrogen Bonds
Ionic Bonds
When studying energy changes, chemists refer to the system and surroundings. The system and the surroundings make up the:
enthalpy
Gibb's Free Energy
Entropy
Universe
Science has been defined by some as the search to put the world in order. Most areas of science have many classification schemes. Science investigators initially use classification systems to :
Organize their observations in a meaningful way
make more accurate inferences
make direct comparisons with standard units of measurement.
extend their powers of observations.
Which substance does the formula MgO represent
dimagnesium oxide
manganese dioxide
manganese oxide
magnesium oxide
The lowest possible temperature is defined as
absolute zero
zero degrees Fahrenheit
zero degrees Celsius
The temperature at which molecular motion reaches maximum
In which part of the electromagnetic spectrum does a photon have the GREATEST energy
Ultraviolet
Red
Violet
Infrared
In a voltaic cell Chemical energy is converted to
nuclear energy spontaneously
electrical energy, non spontaneously
electrical energy, spontaneously
nuclear energy non spontaneously
Which sample of the element has the highest entropy
Hg(l)
F2(g)
Br2(l)
Na(s)
If a substance falls between 1-3 on the pH scale that substance is considered to be a
strong base
weak acid
strong acid
weak base
A
B
C
D
WHich trends are observed as each of the elements within group 15 on the periodic table is considered in order from TOP to BOTTOM
Their metallic properties increase and their atomic radii increases
Their metallic properties decrease and their atomic radii decrease
Their metallic properties decrease and their atomic radii increase
Their metallic properties increase and their atomic radii decrease.
A scientist has found a new drug that appears to provide weight-loss in humans without dieting. The scientist has tested the drug on thousands of people and has found few side effects. The next step taken by the scientist should be...?
Establishing a marketing company to sell and distribute the drug to potential customers throughout the world.
begin to treat individuals with extreme obesity problems.
Notifying the media that a new weight-loss drug will soon be on the market
publishing the study results so other scientists can replicate the study to verify experimental results
A burning match is used to ignite a piece of magnesium ribbon. Once ignited, the magnesium burns brightly, releasing energy. Which type of energy did the burning match provide to activate this process.
Ionization energy
Heat of reaction
Activation energy
Heat of vaporization
Science involves measurement. Accuracy and precision are very important. Accuracy is how close a measurement it to its true value. Precision refers to the consistency of a group of measurements. Which measurement could be performed most accurately using only the human senses.
ripping a sheet of paper into squares that measure 2 cm on each side.
counting 23 shells from a beach
measuring the air pressure of a room
adding 20g of sugar to a gallon of water
A student calculates the density of an unknown solid. The mass is 10.04g and the volume is 8.21 cm3. How many significant figures should appear in the final answer
1
4
3
2
The element Cl (Chlorine) has an atomic number of 17
true
false
A cup of liquid water loses energy to its environment. Which phase change might occur as a result of this loss of energy.
freezing
sublimation
boiling
melting
Which species is an anion
Na+
Cl-1
CH4
H2O
Which of these is a metal?
O
Ne
C
Sn
Which group on the periodic table contains the elements known as the alkaline earth metals
Group 1
Group 2
Group 7
Group 8
