Chem 123 Lab Quiz 1

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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


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