Chem 1 Modules 1-5
If you do not understand a direction or part of a lab procedure, you should:
Ask the instructor before proceeding
When moving from left to right across a period, ionization energy is increasing? By which other trend is this caused?
Decrease of atomic radius
If you accidentally injure or cut yourself, you should immediately:
Inform the lab instructor to get help
Which of the main chemical classes does Cerium belong to?
Metals
Safety goggles:
Must be worn whenever chemical lab is in progress
If you are really hungry during an experiment
NEVER bring food into the classroom!
Based on their phase of matter and what you already learned, which of the elements is clearly not a solid?
Neon
After Schrodinger developed his atomic model, the following subatomic particle was discovered:
Neutrons
Are there any conditions under which a student may work alone?
No
When heating substances in a test tube, be sure the open end of the tube points toward:
No other person
Which of the main chemical classes does Radon belong to?
Non-metals
How would you protect yourself from accidentally ingesting chemicals?
Not eating or drinking in the laboratory Remove gloves and wash hands prior to leaving the lab Do not touch your face with your gloved hand
When disposing of broken glass you should usually:
Place the glass in a special broken glass container
How many valence electrons does calcium have before and after forming an ionic bond with oxygen?
before - 2, after - 8
Based on their phase of matter shown on the Periodic Table, which of the elements is clearly a liquid?
bromine
In the atom, the positive charge is
concentrated in the center of an atom
The volume of ten small metallic spheres with a mass of 12.011 g was determined by placing the sample in a graduated cylinder that had water in it and measuring the volume difference. Graduated cylinder + water + sample = 8.22 mL Graduated cylinder + water = 6.89 mL According to the Table of Densities, the metal should be identified as:
copper
The angular momentum quantum number
describes the shape of the orbital
What is the mass of 15.35 cm3 of iron in grams if the density of this metal is 7.87 g/cm3?
121
Build the Lewis dot structure and answer the following question. What are the predicted bond angles in the molecule C2H2?
180
Applying the trends of oxidation states in the periodic table, what is a likely oxidation state (CHARGE) of calcium in ionic compounds?
2+
The mass of the copper sample is 0.230 kg. The density of copper is 8.96 g/cm3. Calculate the volume of the sample in cm3.
25.7
Build the Lewis dot structure and answer the following question. How many electron domains (groups) surround the central atom in the NH3 molecule?
4
The volume of an irregularly shaped bottle glass sample with a mass of 12.457g was determined by placing the sample in a graduated cylinder that had water in it and measuring the volume difference. Volume of graduated cylinder + water + sample = 15.8 mL Volume of graduated cylinder + water = 13.9 mL The density of glass should be reported as:
6.6g/cm3
Calculate the mass of gold in grams that occupy the same volume as 55.8 g of mercury. The density of mercury is 13.60 g/cm3 and the density of gold is 19.30 g/cm3.
79.2
Build the Lewis dot structure and answer the following question. What is the general formula for the molecular geometry of the SOCl2molecule?
AX3E
When disposing of waste chemicals you should usually:
Add them to the lab waste container provided for the experiment
All of the following statements regarding disposal are true EXCEPT All of the chemicals we use are safe to dispose of down the drain. Paper towels cannot be placed in recycling bins. All solid waste is disposed of in the trash can. Broken or cracked glass is placed in its own specially marked container.
All of the chemicals we use are safe to dispose of down the drain.
Approved eye protection devices (such as goggles) are worn in the laboratory:
Any time chemicals, heat or glassware are used.
What statement(s) is(are) incorrect about Bohrs atomic model Bohr could predict the orbitals of electrons of larger atoms Bohr considered electrons to have both a known radius and orbit Bohr could not predict the behavior of electrons in the presence of magnetic fields
Bohr could predict the orbitals of electrons of larger atoms
If you spill a chemical on a balance you should:
Carefully sweep the chemical into an appropriate waste container
When in the laboratory, you should wear ______
Closed-toed shoes
What is the first thing you should do to with a small spill?
Contain the spill with absorbent or paper towels
After completing an experiment, all chemical wastes should be:
Disposed of according to your instructor's directions
When gathering glassware and equipment for an experiment, you should:
Examine all glassware to check for chips or cracks Clean any glassware that appears dirty Read all directions carefully to know what equipment is necessary
The following statements are true about eyewash stations, except? Hold eyes open for 15 minutes to ensure they are cleansed of the chemical If water is too cold, wait until it gets comfortably warm Always keep access to the eyewash station open in the event of an accident Routinely check the eyewash station for operability
If water is too cold, wait until it gets comfortably warm
What do you think is the reason for an increasing atomic radius within one group?
Increasing number of electron shells
What information can be found on the Safety Data Sheet (SDS)?
Exposure control for the chemical. Exposure control for the chemical. The hazardous characteristics of the chemical.
The safety equipment pictured here is ( hand-held cylindrical pressure vessel containing an agent that can be discharged):
Fire Extinguisher
If the only chemical you can find is labeled with the wrong concentration:
Inform the lab instructor and get instructions
Describe the procedure for smelling a chemical.
Point vessel away from the face while gently fanning vapors toward nose
If you were to accidentally catch yourself on fire you should
Quietly proceed the lab to a fire blanket to warp up in it
Describe the procedure used to operate a fire extinguisher.
Remove pin from the handle; Aim extinguisher hose (if any) at the base of fire; Squeeze handle
Build the Lewis dot structures and answer the following question. Which of the following molecules is nonpolar?
SO3
What is the minimum personal protective equipment that must be used when handling chemicals in a laboratory?
Safety glasses and closed-toe shoes
When heating substances in the laboratory:
Someone should always watch
You wonder what would happen if you mixed chemicals or tried a new procedure. You should:
Stomp that curiosity down. Chemists only do what is in the given procedure.
Build the Lewis dot structure and answer the following question. What is the molecular geometry of the XeOF2 molecule?
T-shape
Long hair in the laboratory must be :
Tied back with a hair band, hairpins or other confining device
Why are no unauthorized experiments permitted in the lab?
The student lacks experience in the lab
When you have taken too much a chemical for an experiment you should:
Try to share the excess with nearby students or dispose of properly
What should you immediately do if you splatter a hazardous chemical on you?
Use the Emergency Shower to promptly wash off the chemical
You were heating a ceramic crucible and now you want to pick it up. You should:
Use tongs
If an acid is spilled on your hand, the best course of action is to:
Wash the acid off with running water in a sink
The positive subatomic particle is
proton
Build the Lewis dot structure and answer the following question. What is the molecular geometry of the SCl4 molecule?
see-saw
Build the Lewis dot structure and answer the following question. What is the hybridization of the central atom in the SF4 molecule?
sp3d
Build the Lewis dot structure and answer the following question. What is the electron domain geometry of the NF3 molecule?
tetrahedral
If an atom is in its ground state, and external energy was applied ....
the electron would move to an orbital further away from the nucleus
If someone is injured or property is damaged due to a student's negligence, who is legally responsible for damages?
the negligent student