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WorksheetsEXTRA CREDIT PSCI semester review - replace lowest tier 2 grade
Total questions: 75
Worksheet time: 1hrs 15mins
Atoms of elements that are in the same group/family generally have the same number of:
valence electrons
protons and neutrons
atomic number
energy levels
Hydrogen-1, hydrogen-2, and hydrogen-3 are all isotopes of each other. This means that:
they have the same number of protons but different numbers of neutrons
they are all identical
they have different numbers of protons from each other
they have different numbers of electrons from each other
The element square in this question has multiple pieces of information on it. What doe each of the numbers represent?
7 is the number of neutrons/14.007 is the number of protons
7 is the mass number/14.007 is the number of electrons
7 is the number of protons/14.007 is the average atomic mass
7 is the mass number/14.007 is the freezing point
If you had to teach a 7th grade student on the correct way to write an element's symbol, you should tell them:
element symbols are always written in all capital letters
element symbols are always written in all lowercase letters
element symbols don't need a specific capital/lowercase letter, anyway you write it is OK
element symbols should have one capital letter followed by a lowercase letter if it has a second letter
Why does ARGON not form compounds?
its too reactive, it would explode
it only forms molecules not compounds
it has an empty outer electron shell (energy level)
it has a full outer electron shell and does not need to gain or lose electrons to be stable
Which statement about alkaline earth metals is correct?
these elements are usually gases
these elements are located in group 2
these elements have 2 energy levels
these elements have 3 valence electrons
An ionic bond is formed between what types of elements?
metal and nonmetal
metalloid and metal
metal and metal
nonmetal and nonmetal
Atoms join together for the purpose of:
balancing subatomic particles
filling their outer energy level with electrons to be stable
gaining an overall positive charge
adding mass to the nucleus
In a chemical formula, when a number is written as subscript after an element's symbol (ex: Cu2) it means:
the number of protons for that element
the mass of that element in a compound
the number of electrons that atom contains
the number of atoms of that element present in the compound
Make a prediction about the charge of transition metals such as cobalt and iron, will they gain or lose electrons to become an ion?
they will gain electrons so they get a negative oxidation number (charge)
they will lose electrons so they get a positive oxidation number (charge)
they will gain electrons so they get a positive oxidation number (charge)
they will lose electrons so they get a negative oxidation number (charge)
_____________ are negatively charged ions.
cations
anions
onions
neutrons
Which of the following is true about ionic compound and its formula?
it is between a cation and anion and the cation is written first
it will always include subscripts, even 1's
it is always between a metalloid and a nonmetal
they are always between nonmetals
Is it OK for a student to work alone in the school lab, without adult supervision
YES
NO
Is it OK to perform lab experiments in the school lab without reading the instructions or directions first?
YES
NO
Is it OK for students to touch electric HOT PLATES with their bare hands after plugging it in to check if its hot?
YES
NO
A possible answer to a scientific question that can be tested is called a:
new theory
scientific method
hypothesis
experimental process
What unit of measurement is used to measure length?
meter (m)
grams (g)
degrees Fahrenheit (F)
milliliters (mL)
What piece of laboratory equipment is used to measure liquid volume?
meter stick
digital balance
ruler
graduated cylinder
Using the picture of this graduated cylinder, what is the closest precise measurement of the liquid it contains?
20mL
24mL
25mL
28mL
A beach ball floats on water because it is:
lighter than air
more dense than the water
less dense than the water
the plastic is lighter than air
Which statement about the atom's nucleus is correct?
the nucleus is the least dense area of the atom
the nucleus is made up of protons (+) and electrons (-)
the nucleus is made up of protons (+) and neutrons (0)
the nucleus houses the electron (-) energy levels (shells)
An atom's mass number equals the number of:
protons
electrons
protons and electrons added together
protons and neutrons added together
Evaporating water produces gaseous water. Which has occurred during this process?
A physical change has NOT resulted in a new substance.
A chemical change has NOT resulted in a new substance.
A chemical change has resulted in a new substance.
A physical change has resulted in a new substance.
According to the periodic table, which pair of elements has similar chemical properties?
Al and Ga
Ge and Se
Ba and Bi
K and Kr
What coefficients must be used in order to balance the equation shown below?
_____Fe + ____O2 ----> ______Fe2O3
4,3,2
2,3,2
2,1,2
4,1,2
The chemical formula for water, H2O, means that each water molecule contains which of the following?
Two hydrogen atoms and one oxygen atom
Two hydrogen atoms and two oxygen atoms
Two hydrogen atoms and zero oxygen atoms
One hydrogen atom and two oxygen atoms
A neutral atom of chlorine has an atomic number of 17 and a mass number of 35. How many protons, neutrons, and electrons does this atom have?
35 protons, 35 electrons, and 17 neutrons
18 protons, 18 electrons, and 17 neutrons
17 protons, 17 electrons, and 18 neutrons
17 protons, 17 electrons, and 35 neutrons
The molecules in a given sample of matter move independently of one another. The substance takes the shape of its container. When the substance is moved from one container to another, its shape changes, but its volume remains the same. What type of substance is being described?
solid
liquid
gas
plasma
According to placement in the periodic table, which of these BEST explains why an ionic bond is the most likely type of bond formed between a metal and a nonmetal?
An ionic bond forms when two atoms share electrons; a metal and nonmetal are likely to share electrons.
An ionic bond forms between oppositely charged ions; metals and nonmetals are likely to be oppositely charged.
An ionic bond forms when one of the atoms is nonreactive; metals tend to be nonreactive and form ionic bonds.
An ionic bond forms when one of the atoms is nonreactive; nonmetals tend to be nonreactive and form ionic bonds.
The covalent compound dinitrogen tetroxide tells you that this compound contains
two nitrogen atoms and four oxygen atoms.
four nitrogen atoms and two oxygen atoms.
four nitrogen atoms and four oxygen atoms.
two nitrogen atoms and two oxygen atoms.
When atoms are neutral, what is the best explanation for this?
The number of protons and the number of neutrons are equal.
The number of protons and the number of electrons are equal.
All atoms contain neutrons, which have no charge.
The number of neutrons and the number of electrons are equal.
The chemical equation shown below is an example of which type of chemical reaction?
Cr + Fe(NO3)2 ----> Fe + Cr(NO3)3
single displacement
decomposition
combustion
double displacement
Which of the following chemical reactions represents a synthesis reaction?
Cu + AgNO3 ----> Ag + CuNO3
2 CH4 + 4 O2 ----> 2 CO2 + 4 H2O
2 N2 + 3 H2 ----> 2 NH3
AlCl3 + 3 NaOH ----> 3 NaCl + Al(OH)3
Which of the following describes the process of grinding quartz down to produce sand?
Chemical change
Change of state
Physical change
Chemical reaction
If calcium and chlorine form a compound, what would the resulting chemical formula be?
CaCl3
CaCl2
Ca2Cl
CaCl
Which statement best describes compounds with covalent bonds?
They tend to be soluble in water.
They are formed between metals and nonmetals.
They conduct electricity well
They share electrons to form bonds.
Which of the following is an example of a chemical reaction?
A substance is dissolved in water.
Two solutions mixed in a beaker produce a solid.
A solution freezes in the freezer.
A metal strip bends when heated
In order for the following equation to be balanced, what coefficient must be placed in front of Al2O3?
4 Al + 3 O2 ----> ___ Al2O3
1
2
3
6
A student wants to transform a sample of gaseous carbon dioxide into solid carbon dioxide. What must she do to accomplish this task?
Add energy to the sample.
Remove energy from the sample.
Add mass to the sample.
Remove mass from the sample.
Which of the following is used to determine the identify of an atom?
number of neutrons
mass number
number of protons
number of valence electrons
The density of aluminum is 2.70 g/cm3. If a piece of aluminum has a volume of 54.0 cm3, what is its mass?
14.6 g
146 g
20.0 g
0.050 g
Of the balanced chemical equations shown below, which one most correctly represents a combustion reaction?
CaO + H2O ----> Ca(OH)2
2 N2 + 3 H2 ----> 2 NH3
2 CH4 + 4 O2 ----> 2 CO2 + 4 H2O
AlCl3 + 3 NaOH ----> 3 NaCl + Al(OH)3
Imagine you are performing an experiment with baking soda and vinegar. You place 5g of baking soda into a balloon and attach it to a small flask containing 10 grams of vinegar. You place your system on a balance and get a total reading of 65 grams. After lifting the balloon to allow the baking soda and vinegar to mix, you observe the balloon begin to fill with gas. When you take the mass of the system after the reaction using your balance, what will the mass be?
65 g
60 g
10 g
5 g
What is the chemical formula for the ionic compound formed between aluminum and oxygen atoms?
Al2O2
Al3O2
Al2O3
Al3O3
The chemical equation below shows the reaction between phosphorus and oxygen to form phosphorus pentoxide. Does the reaction obey the law of conservation of mass?
P4 + 5 O2 ----> 2 P2O5
No, because there are not the same number of phosphorus atoms on both side of the reaction.
No, because there are not the same number of oxygen atoms on both side of the reaction.
Yes, because there are equal numbers of phosphorus and oxygen atoms on both sides of the reaction.
Yes, because the reaction is a decomposition reaction.
What would happen if in a circuit the voltage is increase?
The time would increase
The current would increase
The current would decrease
The current would stay the same
In order to electrical current to flow through a wire the wire must be connected in a ____________ that includes a source of electrical current.
averager matter
Complete loop
In an incomplete loop
Interrupted Circuit
If lamp 1 is unscrewed from its holder, what will happen to lamp 2?
It will get brighter
It will stay the same brightness
It will go out
Nothing will happen
If lamp 2 is unscrewed from its holder, what will happen to lamp1?
It will stay lit
It will go out
It will get dimmer
It will dissapear
What is potential energy?
moving energy
stored energy
renewable energy
non renewable energy
What is kinetic energy?
moving energy
potential energy
stored energy
renewable energy
Four balls are thrown at the same velocity, with different masses. Which ball has the most kinetic energy?
The 20g ball
The 50g ball
The 24g ball
The 40g ball
What is the measurement of the average kinetic energy of the molecules of a substance?
Kinetic energy
Temperature
Velocity
Potential energy
