Chem 123 Lab Quiz 1
In case of accidental contact with chemicals, how long should the eyes be flushed at the eyewash station?
15 min
Remove clothing and continue flushing the area for
15 min
When testing the pH of a solution with litmus paper, dip ____ in the solution. Add a _____ of the solution to the paper. Observe the ____ of the litmus paper and determine whether the solution is acidic or basic.
A stirring rod, drop, color
After the liquid is drained from the pipet, the final drop is pushed through with the pipet bulb.
Affects Accuracy
Air bubbles are present as the liquid is drawn up into the pipet and dispensed.
Affects Accuracy
The liquid level in a pipet is read from the top of the curve rather than the meniscus.
Affects Accuracy
Pipets are washed with detergent and then put to use immediately.
Affects contamination
The pipet is not cleaned thoroughly between uses.
Affects contamination
When inputting a formula into Excel or other spreadsheet software, what components are required for the formula to function properly?
An equal sign at the beginning of the formula, Closing parentheses for any opening parentheses
Identify the types of information that are necessary to communicate with emergency responders.
Any chemicals involved in an incident, How the incident happened, Any other hazards present in the lab.
What purposes can funnels serve in the lab?
Assistance for pouring liquids into burets, Support for filter paper during a gravity filtration, Help for transferring solid chemicals from weigh boats.
Pouring an approximate volume of liquid into a buret
Beaker
A student removes a chemical sample from a reagent bottle to be used in an experiment. What should he do with any excess chemical remaining from this sample after the experiment is complete?
Check and see if anyone else can use the chemical. If not, discard in the proper waste container.
copper(II) nitrate + sodium hydroxide → ____ + sodium nitrate
Copper (II) Hydroxide
When using a clamp and ring stand to hold glassware and tools, what is the best position for the clamp?
Directly above the base of the ring stand
When you are done using most glassware in the lab, what should you do?
Dispose of any chemicals in the proper waste container., Clean the glassware with a detergent solution., Return the glassware to the appropriate location to dry.
Containing a stirred reaction mixture
Erlenmeyer Flasks
Wearing gloves means you do not need to wash your hands before leaving lab.
FALSE
Fire on a person
Fire Blanket
Identify the step that is not recommended when responding to an emergency.
Gather your belongings.
Measuring out a volume of liquid
Graduated Cylinder
Identify the precautions to take with exits in the lab.
Locate the exits prior to the start of lab., Do not block a door with an EXIT sign.
What information is needed in order to be prepared for an emergency?
Location of all exits, Contact information for emergency personnel, Location of lab phone and first aid kit, Understanding of where to go should an emergency occur.
Identify effective techniques for accurate pipet use.
Measure liquid by aligning the meniscus with the volume line., Do not let liquid enter the pipet bulb or pump.
Are students permitted to work alone in lab?
NO
What needs to be included in the label for each axis of a graph?
Name of quantity displayed on axis, Units of quantity displayed on axis
Acronym for using a fire extinguisher
PASS - Pull , Aim, Squeeze, Sweep
Which signs are typically posted in areas of active lab work?
Personal protective equipment (PPE) sign, Sign prohibiting food and drink, Safety equipment signs, Chemical storage signs
____ The pin
Pull
Move to the safety show if you spill hazardous chemicals on your
Skin or clothing
What is most precise work?
Smaller standard deviation
At the end of the procedure, A Cycle of Chemical Reactions of Copper, what is the expected final product?
Solid Cu Dust
What visible signs indicate a precipitation reaction when two solutions are mixed?
Solid settling out in the test tube, A hazy or cloudy appearance
When taking a measurement with a pH meter, keep the instrument in the ____ until it is needed. Rinse the pH meter with _____ and gently pat dry. Place the meter in the sample solution, and record the measurement when the pH ____.
Storage solution, Deionized water, stabilizes.
TC
To contain
To measure out a volume of liquid, start by choosing the appropriate graduated cylinder and moving the bumper to the ___ of the graduated cylinder to protect it from breakage. Then, pour the liquid into the graduated cylinder until the ____ of the meniscus aligns with the desired volume marking when you look at the graduated cylinder from ____.
Top, bottom, eye level
What shoe is best for lab?
Your feet should be completely covered with a rugged material in lab. Leather or leather-like sneakers or other shoes are a good choice for this.
copper(II) phosphate + hydrochloric acid → _____ + phosphoric acid
copper (II) chloride
chemicals in eyes
eyewash station
Large fire on the bench top
fire extinguisher
Cuts or minor burns
first aid kit
The purpose of the best-fit line on an experimental scatterplot is to ____
identify any linear trend in scattered data
copper(II) chloride + ____ → magnesium chloride + ____
magnesium, copper
The best-fit line allows us to
predict behavior between measured data using its slope
Stand under the shower and ____ the lever
pull
In the presence of an acid, litmus paper will turn
red
chemicals on clothes
safety shower
copper(II) sulfate + ____ → copper(II) phosphate + sodium sulfate
sodium phosphate
_____ the lever slowly
squeeze
copper(II) hydroxide + ____ → copper(II) sulfate + water
sulfuric acid
_____ the spray from side to side over the fire
sweep
TD
to deliver
According to the lab procedure, what are the required components for graphs to be produced in lab?
x- and y-axes with proper labels, Title, An appropriately-scaled data range
____ the nozzle at the base of the fire
aim
In the presence of a base, litmus paper will turn
blue
