Chemistry lab

Determine where to dispose of each type of waste. syringe tips __________ unused soild reagent __________ titrant solution __________ broken flask ____________

-sharps container -solid waste container -nalgene bottle with cap -box lined w/ puncture resistant bag

How many kilometers is 2584.5 cm?

0.025845

A block has a mass of 4.465 g and a volume of 143.2 cm3. Calculate the density in g/cm3.

0.0311

Perform the calculation, rounding your answer to the proper number of significant figures. 0.8730 ÷ 9.650 =

0.09047

Steps to clean up a liquid spill

1. Surround the area with absorbent material then cover the spill. 2. Scoop up the material and place in a plastic bag 3. Place the bagged waste in a solid waste container 4. Wipe down the area with detergent and water

A 2.69 g piece of zinc (density = 7.14 g/mL) is added to a graduated cylinder that contains 12.13 mL H2OHX2O . What will be the final volume reading on the graduated cylinder, in mL?

12.506

Perform the calculation, rounding your answer to the proper number of significant figures. 0.384 + 5.28 + 15.0007 =

20.66

Perform the calculation, rounding your answer to the proper number of significant figures. 0.867 + 3.72 + 18.0045 =

22.59

A graduated cylinder contains 10.00 mL water. A 14.74 g piece of aluminum is added to the water, and the volume rises to 15.46 mL. What is the density of the aluminum in g/mL?

3.10

A 24.5 g sample of solution has a density of 0.768 g/mL. What is the sample volume (in mL)?

31.901

A series of measurements in the lab led to an experimental result of 32.9 mL, with a calculated standard deviation of 0.3 mL. What is the standard way to report this result?

32.9 ± 0.3 mL

Perform the calculation, rounding your answer to the proper number of significant figures. 0.982 x 4.71 x 8.3 =

38

Read the Safety Data Sheet (click SDS icon below) of hydrogen peroxide to identify the recommended way to store this substance. Select one: A)In a tightly closed container in a dry and well-ventilated place B)In a glass, leak-proof bottle on a shelf or cabinet C)In an open container in a bright and humid environment D)In a well-ventilated container in a closed, dry area

A

When should lab participants look at the Safety Data Sheet (SDS) of a substance? Select one: A)Before using the substance B)Only if the substance is perceived to be dangerous C)After completing work with the substance D)While working with the substance in lab

A

When should you start a new chemical waste container in the lab? Select one: A)When the contents of the current container are a couple inches below the brim of the container B)When the contents of the current container completely fill the container to the brim C)When you accidentally spill chemicals down the side of the current container D)When you need to dispose of another chemical that is compatible with chemicals in the current container

A

In general, which characteristics are necessary for a location to be suitable for chemical storage? Select one or more: A)poorly-ventilated B)dry C)dark D) warm

A B C

Which types of signs are posted to convey information about chemical storage? Select one or more: A)Hazard signs such as "Flammable," "Oxidizer," and "Corrosive" B)National Fire Protection Association (NFPA) diamond C)Gas Cylinder sign D)Exit sign

A B C

Which signs are typically posted in areas of active lab work? Select one or more: A)Sign prohibiting food and drink B)Chemical storage signs C)Personal protective equipment (PPE) sign D)Safety equipment signs

A B C D

Identify the types of information that are necessary to communicate with emergency responders. Select one or more: A)Any chemicals involved in an incident B)How the incident happened C)The history of safety incidents in the lab D)Any other hazards present in the lab

A B D

Which steps are necessary for cleaning a spill involving broken glass? Select one or more: A)Stop the spread of the spill. B)Soak up any spilled liquid with absorbent material. C)Pick up large pieces of glass with gloved hands. D)Wash off the broken glass for recycling.

A,B,C

When working in a fume hood, what is the best position of the hood sash?

As low as possible, no more than halfway up

When is the best time to clean glassware during the lab session?

As soon as practical after use

In case of accidental contact with chemicals, how long should the eyes be flushed at the eyewash station? Select one: A)5 minutes B)15 minutes C)Until the irritation is gone D)30 minutes

B

What is the last step of any spill cleanup procedure? Select one: A)Post a sign in the area of the spill, alerting others to stay away. B)Wipe down the affected area with detergent and water. C)Sweep the area with a broom and dustpan. D)Soak up the spill with absorbent material, then discard.

B

What is the main precaution to take if a Gas Cylinder sign is present in the lab? Select one: A)Remove the strap from around the gas cylinder to use it in the lab. B)Visually check that the gas cylinder is restrained but keep a safe distance from it. C)Test out the regulator on the gas cylinder to make sure it is working properly. D)Open the valve on the gas cylinder periodically to release pressure.

B

Which is NOT a good source of information about the hazards that affect waste disposal in a chemistry lab? Select one: A)Your instructor's directions B)Your lab partner C)The chemical Safety Data Sheets D)The chemical bottle labels

B

What are the best practices for safely handling waste in the lab? Select one or more: A)Remove gloves for better manipulation of the waste containers. B)Always wear appropriate Personal Protective Equipment. C)Check labels or instructions before any disposal D)Place any paper towels from the clean-up in the trash

B C

What should you do every time you are about to heat glassware on a hot plate? Select one or more: A)Measure the height and width of the glassware B)Check that there are no cracks in the glassware C)Ensure that the glassware is designed for heating D)Inspect the hot plate for frayed cords

B C D

What are the best practices for safely handling waste in the lab? Select one or more: A)Place any paper towels from the clean-up in the trash. B)Always wear appropriate Personal Protective Equipment. C)Remove gloves for better manipulation of the waste containers. D)Check labels or instructions before any disposal.

B D

Determine when you should remove your goggles in the lab room. Select one: A)Whenever your goggles become foggy or uncomfortable B)Whenever you need to lean in close to get a volume reading C)When everyone in the room is done handling any chemicals or glassware D)When you have finished cleaning up your chemicals and glassware

C

Under what conditions should a student inform the instructor of a lab injury? Select one: A)The instructor needs to be alerted only if he or she needs to call 911. B)The instructor should be alerted only if the injury involves broken skin. C)The instructor must be informed of all laboratory injuries. D)The instructor should be alerted only if the lab injury appears different from injuries the student has experienced previously.

C

What action is NOT necessary before lighting a Bunsen burner? Select one: A)Make sure there are no holes in the hose connected to the burner. B)Check that the gas regulator and air inlet on the burner can be adjusted. C)Leave the gas cock open for a few minutes before lighting to clear the line. D)Clear the burner area of flammable materials such as solvents and papers.

C

What is the main precaution to take if a Gas Cylinder sign is present in the lab? Select one: A)Open the valve on the gas cylinder periodically to release pressure. B)Test out the regulator on the gas cylinder to make sure it is working properly. C)Visually check that the gas cylinder is restrained but keep a safe distance from it. D)Remove the strap from around the gas cylinder to use it in the lab.

C

What should you do after finishing work with a reagent bottle? Select one or more: A)Place the bottle in the Solid Waste container. B)Leave the bottle open in case someone else needs it. C)Close the bottle D)Return the bottle to its proper storage location

C D

Convert 0.565 miles to feet 0.565 miles×( C )/( D ) what do C and D represent and how many feet?

C= 5280 D=1 mile answer= 2983.2

How to chnage gloves

Changing gloves often will minimize the spread of chemicals. To properly remove gloves, first, grasp the exterior of one glove with a gloved handinsert a gloved finger into one glovegrasp the exterior of one glove with a bare hand, and then, peel off the first glove rip off the first glovewash off the first glove Then insert tongsa bare finger a gloved finger between the interior edge of the second glove and the skin, and remove the second glove.

When using a properly stabilized balance, how should you ensure that you get the most accurate mass reading possible?

Close the side shields on the balance during reading. Measure the mass of the sample at room temperature

What are the substances making up a mixture called

Components

Which reaction in the set of copper reactions is an example of a decomposition?

Cu(OH)2(s)Δ−→CuO(s)+H2O(g)

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? Select one: A)Conduct a second trial of the experiment with the excess chemical. B)Clean a spatula thoroughly, then use it to add the chemical back into the reagent bottle. C)Discard the chemical down the sink under running water. D)Check and see if anyone else can use the chemical. If not, discard in the proper waste container.

D

Determine when to put on disposable gloves for work in the lab. Select one: A)Before entering the laboratory room B)After setting up all the glassware but before handling chemicals C)After cleaning all the glassware for the experiment D)Before handling any glassware or chemicals for the experiment

D

What information does not need to be included a chemical waste label? Select one: A)Names of the chemical compounds present in the container B)The date the waste container was filled completely C)Relative amounts of chemical compounds in the container D)A description of the experiment the chemicals were used for

D

What is the first step for response to an emergency situation? Select one: A)Yell for help and assist with the evacuation of the lab. B)Discuss the situation with the other students until everyone agrees on what to do. C)Run outside the building as quickly as possible and call 911. D)Remain calm and quiet, gather information, and assess the situation.

D

Which chemical waste situation should always be supervised or performed by an instructor? Select one: A)Cleaning up solutions from a titration experiment B)Cleaning up solid residue from a precipitation experiment C)Cleaning up a broken beaker containing sodium chloride solution D)Cleaning up a broken mercury thermometer

D

This is the process of separating a liquid from a solid (sediment) by gently pouring the liquid from the solid so as not to disturb the solid.

Decantation

How can a solid dissolved in water be separated from the water?

Evaporation

A solvent is added to dissolve only one mixture component and then the liquids are separated.

Extraction

Which process is used to separate soluble compounds from insoluble compounds?

Extraction

This is the process of separating a solid from a liquid by means of a porous material.

Filtration

Which procedure cannot be performed on a hot plate, requiring a Bunsen burner instead?

Heating a crucible to remove water from a hydrate

What are minor components in a mixture called?

Impurities

which PPE matches the best with this incident:While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench.

Labcoat

What is the diamond sign?

NFPA diamond

what type of separation technique needs to be used when A solid mixture is heated. One component transitions directly between solid and gas.

Sublimation

How should the mass of copper metal at the end of the reactions compare to the starting mass of copper?

The produced mass of copper should equal the starting mass of copper.

What is the purpose of stirring a solution while it is being heated?

To help evenly distribute heat throughout the solution

The composition of homogeneous mixtures is ______________.

Uniform

The composition of heterogeneous mixtures is ______________.

Variable

Addition and subtraction sig figs

When performing an addition or subtraction calculation, significant figures in the calculated result are dictated by the decimal places of the measured numbers. The calculated result should have the same number of significant figures past the decimal point as the measured number in the calculation with the fewest digits past the decimal point.

what type of separation technique needs to be used when A solvent is added to dissolve only one mixture component and then the liquids are separated.

extraction

The green sign with an eye represents what?

eyewash station

A solid is caught on paper or a membrane while the liquid passes through.

filteration

what type of separation technique needs to be used when A solid is caught on paper or a membrane while the liquid passes through.

filtration

What is the sign with a red boarder and a black cylinder icon represent?

gas cylinder

which PPE matches the best with this incident While picking up a buret, an unknown solution left by a previous solution drips onto your hand.

gloves

which PPE matches the best with this incident. While checking on a stirring solution, the solution splashes up towards your face

googles

When a vinegar and oil salad dressing separates into two layers, the oil floats on top of the vinegar. The density of the oil ____________ the density of the vinegar.

is less than

Most of the ____ people encounter in everyday life consists of _____ of different substances.

matter, mixtures

blue flame you should________ the _________ further.

open, air inlet

to increase the size of the flame, you should________the ________ further.

open, gas regulator

The separation of the components of a mixture is based upon the fact that each component has different_________properties.The components of a mixture are separated based on their______ properties.

physical ,physical

How to turn on shower if chemicals spilled on you or clothing?Duration

pull,15 min

whereas_____substances have _____ the compositions, the composition of _____ can vary.

pure, fixed, mixtures

Sublimation is s phase change from and what pahse is not present?

solid to a gas without going through a liquid phase.

Sublimation is a phase change from_____ to ______. The _____ phase is not present in this change.

solid, gas, liquid

Steps to boil solution on a hot plate.

star by starting and stablizing the stir function, the turn heat to medium heat, then if necessary turn up heat setting

A solid mixture is heated. One component transitions directly between solid and gas.

sublimation

While setting up a beaker on a hot plate and the stirring becomes erratic what do you do?

turn down stirring speed and move the beaker to the center of the hot plate

What does each color of the NFPA diamond represent? yellow blue white red

yellow-reactivity blue-health red-fire white-special hazards

Identify which balance was used to make each mass reading. 1.230 g, 0.90 g, 5.43 g, 6.539 g, 4.0000 g

±0.001,±0.01, ±0.01, ± 0.001, ± 0.0001

what type of separation technique needs to be used when A liquid is carefully poured out, leaving the solid behind in the container.

decantation

A liquid is carefully poured out, leaving the solid behind in the container.

decantation

relative order of the metric prefixes of kilo-,micro-, centi-, and milli

(smallest)micro, milli, centi, kilo(largest)

What information is needed in order to be prepared for an emergency? Select one or more: A)Location of all exits B)Contact information for emergency personnel C)Understanding of where to go should an emergency occur D)Location of lab phone and first aid kit E)Full inventory of all chemicals present in the lab

a b c d

Convert 7860 feet to miles 7860 feet×( A )/( B ) what does a and b represent and how many miles?

a= 1 mile b= 5280 answer=1.488

In order to use a pipet, place a_________ at the top of the pipet. Use this object to fill the pipet such that the_______of the liquid is even with the volume line. Release the liquid, touching the tip of the pipet to the side of the container if necessary to release the last drop________the pipet tip.

bulb or pump, meniscus, outside

Each of the substances in the mixture retains its______idenity. Mixtures are separable into these components by ____ means.

chemical, physical

which PPE matches the best with this incident What kind of PPE would While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor.

closed-toe shoes