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WorksheetsSemester 1 Chemistry Review 2021
Total questions: 80
Worksheet time: 1hrs 10mins
A phosphorous isotope consists of 15 protons, 15 electrons, and 16 neutrons. What is its mass number?
30
15
31
46
What is an orbital?
region of an atom that contains the protons and neutrons; also called the nucleus
A 3D region around the nucleus that indicates the probable location of an electron
The number of protons and neutrons in the nucleus of an atom
The electrons in the outermost energy level or shell, of an atom
Which of the following can be explained by the nuclear model of the atom? Select all correct answers.
Atoms have electrical charges.
Electrons have wave-like properties.
Electrons exist at specific energy levels.
Most of the space in an atom is taken up by electrons.
Atoms of the same element may have different mass numbers.
True
False
Which atomic particle has about the same mass as a neutron but has a positive electrical charge?
neutron
electron
proton
orbital
The 2s subshell is at a lower shell than the 1s subshell.
True
False
Refer to the periodic table. Which element has the highest electronegativity?
carbon
lithium
fluorine
oxygen
Which element is most similar in behavior to lithium?
calcium
magnesium
chlorine
sodium
How many valence electrons does sulfur have?
2
4
6
8
What is ionization energy?
the energy required to move an electron from an atom
measure of the attraction that an atom has for the electrons it shares in a molecule
half the distance between the nuclei of identical atoms that are bonded together
same thing as electron configuration
Electronegativity generally ______________ across a period and _________down a group.
increases, decreases
decreases, increases
stays the same, decreases
increases, stays the same
Ionization energy generally ________ as you go across the PT from left to right.
stays the same
decreases
increases
fluctuates wildly
How does the atomic radius change as you move left to right on the periodic table across a period?
does not change
generally increases
generally decreases
fluctuates wildly
What statement is the best explanation for why the atomic radius generally increases with atomic number in each group of elements?
The number of neutrons increases
A new octet forms
The nuclear charge increases
The number of occupied shells increases
What gas is unreactive according to its position of the periodic table?
oxygen
sodium
chlorine
argon
Choose the correct electron configuration for Neon
1s22s22p63s23p4
1s22s22p63s23p2
1s22s22p63s2
1s22s22p6
What is this image?
electron dot notation for chlorine
electron dot notation for carbon
electron configuration for carbon
electron configuration for cesium
How can you avoid mixing the wrong chemicals together?
color code
read labels
taste them
touch the solution
What should you do with your hair before an experiment?
shave it
dye it
tie back your hair
leave it as is
Choose the correct behavior during a lab
Don't throw things or climb on stuff
Stand on the ceiling
Walk your fish
Drink the chemicals
Why is it necessary to keep your lab table/workspace clean and not dirty?
Having a dirty workspace helps you focus more
it's not necessary
Keeping it clean will help you stay organized and yield better results
none of the above
Leave your workstation ________ before leaving the lab.
messy
chemicals and equipment out
clean
disorganized
What should you do if you get stuck on assignment/lab in class?
freak out and panic
just roll with it
ask a teacher or classmate for help
board a plane and fly to Alaska
What do you do if you spill a chemical?
Leave it
Mix another chemical with it
Wipe it up yourself
Ask the teacher for assistance if needed
What do you do when an accident happens?
tell the teacher
leave it alone
play with the mess
try to hide it
Where should your test tube be pointed?
at someone else
at yourself
at nothing; pointed straight up
at your friend's head when the teacher isn't looking
How should you smell odors or fumes in the lab?
Rub the substance all over your hand and smell your hands
Stick the substance into your nose
Use a hand to wave the odor toward your nose
Hold the substance up to your nose and inhale deeply
What should you do if you want to leave your lab station?
check your surroundings
finish your work and leave
ask the teacher if you may leave
ask your friend if you may leave
Choose the correct option for chemical disposal:
Discard the chemicals in the trash
Discard the chemicals in the sink
Discard the chemicals on your friend
Discard the chemicals according to written and/or verbal instructions
When moving a hot beaker, what tool should you use?
beaker tongs
plastic gloves
bare hands
paper towels
What should you do when carrying chemicals?
Run with them
Perform a backflip with a beaker in your hand
Walk with them
Drop them on the ground
Which of the following is appropriate behavior during lab?
Talk to your group and work on the lab
Go and talk to a person in another group
Play around with the equipment instead of performing the experiment
Go on your phone, ignore your labmates, and don't participate in the lab
Are you allowed to eat and drink during a lab (or anytime in science class)?
yes, as long as you don't make a mess
yes, and you don't have to clean up
no, because lunch is after this class
no, because it makes the classroom messy and unsafe
Where should you return your equipment, chemicals and goggles?
Drink the chemicals and eat the goggles
To the sink
Give them to the teacher or pile them on her desk in a big heap
Return to the designated location
Which Lewis Dot Model drawing correctly shows an O2 molecule?
Which of these Lewis structures is incorrect?
How many bonds are there in the compound CH3Cl?
3
4
6
7
Which of the following elements is an exception to the "Octet" rule?
Carbon (C)
Hydrogen (H)
Oxygen (O)
Sodium (Na)
How many bonds does Carbon (C) form?
1
2
3
4
How many bonds does Oxygen (O) form?
1
2
3
4
How many bonds does Hydrogen (H) form?
1
2
3
4
How many bonds do the elements in Group 17 ("Halogens") form?
(F, Cl, Br, I)
1
2
3
4
Which of the following is a correct drawing of the molecule H2?
Which of the following is the correct Lewis dot diagram drawing for the molecule Cl2?
Which of the following is a covalent molecule?
(Use the Periodic Table)
NaCl
MgO
O2
K2S
Which of the following is a covalent molecule?
(Use the Periodic Table)
CCl4
MgCl2
KF
K2S
How many atoms of hydrogen are in a sugar molecule with the formula C6H12O6
12
6
24
18
How many valence electrons does Oxygen have?
2
4
6
8
