Chem 1211K Lab Final Exam
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
The reaction between sodium hydroxide and hydrochloric acid is considered which type?
Neutralization
Most laboratory chemical spills are cleaned up in a similar manner, but acid and base spills require an extra step. What is this extra step?
Neutralize the spill before cleaning it up.
Determine the safest option in the lab if you need your vision to be corrected.
Wear corrective glasses or lenses under your safety goggles for the whole experiment, but always check with your TA or Instructor for your school's policy
Suppose an air bubble is trapped in the eudiometer before starting the experiment. After the experiment is finished, the resulting value of R would be
too large
Perform the calculation, rounding your answer to the proper number of significant figures. 0.8730 ÷ 9.650 =
0.09047
How many moles of H2 can be formed if a 2.83 g sample of Mg reacts with excess HCl ?
0.116
Calculate the moles of ammonia present in a 2.864 g sample if the molar mass of ammonia is 17.030 g/mol.
0.1682
Suppose you are titrating vinegar, which is an acetic acid solution of unknown strength, with a sodium hydroxide solution according to the equation HC2H3O2+NaOH⟶H2O+NaC2H3O2 If you require 30.05 mL of 0.1835 M NaOH solution to titrate 10.0 mL of HC2H3O2 solution, what is the molar concentration of acetic acid in the vinegar?
0.551
The temperature of a room is 19.1 °C. What is this temperature expressed in Kelvin (K)?
292.3
What is the correct reading for the graduated cylinder in the close-up?
40.5 mL
Changing gloves often will minimize the spread of chemicals. To properly remove gloves, first__
Changing gloves often will minimize the spread of chemicals. To properly remove gloves, first, grasp the exterior of one glove with a gloved hand, and then, peel off the first glove . Then insert a bare finger between the interior edge of the second glove and the skin, and remove the second glove.
The H2 produced in a chemical reaction is collected through water in a eudiometer. If the pressure in the eudiometer is 760.0 torr and the vapor pressure of water under the experimental conditions is 20.9 torr, what is the pressure (torr) of the H2 gas?
739.1
Sulfuric acid, H2SO4, is an important industrial chemical, typically synthesized in a multi-step process. What is the percent yield if a batch of H2SO4 has a theoretical yield of 3.4 kg, and 2.7 kg are obtained at the end of the process?
79%
What is the value of 218 calories in joules (J)?
912.1
A balloon is inflated outside on a cool morning. As the temperature rises, reaching its peak in the afternoon, the volume of the balloon will
A balloon is inflated outside on a cool morning. As the temperature rises, reaching its peak in the afternoon, the volume of the balloon will increase. As the temperature cools down again in the evening, the volume of the balloon will decrease.
After a mixture has been poured through filter paper, the
After a mixture has been poured through filter paper, the solid component remains on top while the liquid flows through. To collect the solid, spread the filter paper on a watch glass and allow the solvent to evaporate.
After a recrystallization, a pure substance will ideally appear as a network of
After a recrystallization, a pure substance will ideally appear as a network of large crystals. If this is not the case, it may be worthwhile to reheat the flask and allow the contents to cool more slowly.
Why should you use a finely ground solid when determining the melting point of a sample?
Air pockets in a coarse sample could disrupt heat distribution. Uniform, small particles heat more consistently throughout the sample.
What is the correct formula for aluminum hypochlorite?
Al(ClO)3
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
The indicator phenolphthalein is added to the _____________.
Analyte
When performing a melting point determination, how should you report your findings?
As a range from the temperature when melting starts to the temperature when it ends
What parts are present in every chemical equation?
At least one reactant At least one product An arrow
What is the advantage of fluted filter paper shown compared with cone-shaped filter paper?
Fluted filter paper has more surface area suitable for collecting solid.
If a pH meter is not able to give an accurate measurement, it may need to be
If a pH meter is not able to give an accurate measurement, it may need to be calibrated. This process requires two buffers of known pH.
The equivalence point of any acid-base titration can be determined visually from a titration curve by finding the place where
the curve has the steepest slope.
Determine where to dispose of each type of waste.
unused solid reagent>>Solid waste containerbroken flask>>Box lined with puncture resistant bag syringe tips>>Sharps container titrant solution>>Nalgene bottle with cap
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
Suppose 0.0350 g Mg0.0350 g Mg is reacted with 10.00 mL of 6 M HCl10.00 mL of 6 M HCl to produce aqueous magnesium chloride and hydrogen gas.
Magnesium metal
What practice will not help you make an accurate volume reading on a buret at the beginning of a titration?
Make sure that the meniscus starts exactly at 0.00 mL.
Mass is conserved in an experiment if the
Mass is conserved in an experiment if the sum of the individual component masses equals the mass of the mixture of the components.
When taking pH measurements of solutions, why is it important to stir thoroughly after adding each reagent?
Mixing helps ensure that the measured pH is reflective of the entire solution.
What is the correct formula for manganese(II) fluoride?
MnF2
Hydrochloric acid and sodium hydroxide react to form _____________.
NaCl + H2O
What is the first step for response to an emergency situation?
Remain calm and quiet, gather information, and assess the situation.
Refer to the periodic table to find the correct molar mass for each element and compound.
S >>32.059 g/mol CH4CH4 >>16.042 g/mol C2H6C2H6 >>30.067 g/mol O >>15.999 g/mol Cl >>35.446 g/mol O2 >>31.998 g/mol
When performing a multiplication or division calculation, significant figures in the calculated result are dictated by the
When performing a multiplication or division calculation, significant figures in the calculated result are dictated by the significant figures of the measured numbers. The calculated result should have the same number of significant figures as the measured number in the calculation with the fewest significant figures.
Which compounds could be represented by the empirical formula CH2
c3h6 c2h4 c8h16
What is the name of the compound with the formula of Cr2S3 ?
chromium(III) sulfide
Identify each lab safety sign pictured.
gas cylinder exit safety shower eyewash station NFPA diamond
Perform the calculation, rounding your answer to the proper number of significant figures. 0.517 x 5.28 x 3.7 =
10
Potassium hydrogen phthalate is ____________.
A primary standard
When a known quantity of compound, at a known concentration, is added to a known volume of another compound to determine the concentration of the latter, the process is referred to as _____________.
A titration
A titration curve is a plot of
A titration curve is a plot of titrant volume on the x-axis and pH on the y-axis.
Using the letters on the image, identify the significance of each section on the NFPA diamond.
A. Health B. Flammability C. Reactivity D. Special Hazards
Using the letters on the image, identify each component of the liquid waste set-up.
A>>Funnel B>>Primary container C>>Waste label D>>Secondary container
How should students prepare to use chemicals in the lab?
Become familiar with the chemicals to be used, including exposure or spill hazards. Locate the spill kits and understand how they are used.
Determine when to put on disposable gloves for work in the lab.
Before handling any glassware or chemicals for the experiment
When using a pH meter to monitor a stirring reaction mixture, where should you place the pH sensor electrode?
Between the stirring vortex and the side of the glassware
Read each statement regarding food and beverages in the lab and determine if each is true or false.
Chewing gum is okay in the lab as long as you don't blow bubbles.>>False Beverages are allowed in lab as long as they are in containers with lids.>>False Tobacco products of all kinds are prohibited in lab. >>True Food items should not be brought into the lab. >>True
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.
Which term describes a solution having a very well-known concentration of solute?
Standard solution
When equal moles of an acid and a base are mixed, after reaction the two are compounds are said to be at the _______________.
Stoichiometric point
Suppose you mix two solutions in a test tube and the test tube becomes hot. This is
Suppose you mix two solutions in a test tube and the test tube becomes hot. This is a sign of a chemical reaction because chemical changes can release heat.
Identify the description that applies to the substance represented by each NFPA diamond.
The National Fire Protection Association (NFPA) diamond gives a visual guide to the hazards that apply to a substance. The diamond is made up of four inner diamonds, each representing a certain type of hazard: blue for health, red for fire, yellow for reactivity, and white for special hazards. Numbers from 0 to 4 in the three upper diamonds represent increasing levels of risk, and special hazards are listed in the bottom white diamond. --- - moderately unstable or reactive - has a flash point below room temperature - oxidizer, not flammable - stable, has health risks but no special hazards
In the Ideal Gas Law lab, how is the temperature of the hydrogen gas determined?
The temperature of the water bath is measured after the reaction, which is assumed to be the same temperature as the gas.
How does the titration curve of a diprotic acid differ from that of a monoprotic acid?
There are two equivalence points.
Identify the aspects of the pictured graph that are missing or contain errors.
Title y-axis numeric range x-axis label
The liquid dispensed from a burette is called ___________.
Titrant
Suppose you are given the mass of each element in a compound sample. To calculate the empirical formula, start by
To calculate the empirical formula, start by converting the mass of each element to moles using each element's molar mass. Then, calculate the ratio between the elements by dividing the moles of each element by the smallest number of moles present.
What is the recommended order of measurements to report the most accurate melting point possible?
Use slow heating to confirm the careful measurement. >>Third step Use quick heating to estimate the melting point. >>First step Use slow heating to carefully observe melting. >>Second step
In lab, you may need to evaluate the odor or smell of a chemical. What is the best way to smell a chemical sample?
Use your hand to gently waft the smell toward you.
What is the main precaution to take if a Gas Cylinder sign is present in the lab?
Visually check that the gas cylinder is restrained but keep a safe distance from it.
Match each lab incident to the item of PPE that will protect you from it. Each item of PPE will only be used once.
While picking up a buret, an unknown solution left by a previous solution drips onto your hand.>>Gloves While checking on a stirring solution, the solution splashes up towards your face.>>Goggles 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 While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench.>>Lab coat
What is the last step of any spill cleanup procedure?
Wipe down the affected area with detergent and water.
Which is NOT a good source of information about the hazards that affect waste disposal in a chemistry lab?
Your lab partner
Predict the products of hydrochloric acid reacting with zinc metal.
ZnCl2 H2
Which types of signs are posted to convey information about chemical storage?
- Hazard signs such as "Flammable," "Oxidizer," and "Corrosive" - National Fire Protection Association (NFPA) diamond - Gas Cylinder sign
What is the value of the gas constant, R, in units of
0.0821
Suppose you heat a metal object with a mass of 32.2 g to 95.2 oC and transfer it to a calorimeter containing 100.0 g of water at 17.6 oC. The water and metal reach a final temperature of 22.3 oC. What is the specific heat of the metal in J/g-oC?
0.84
Calculate the volume of a box, in cubic centimeters, which is 423 cm long, 12 cm wide, and 25 cm high. Report your answer with correct significant figures in cubic centimeters.
130000
Knowing that one day is 24 hours and one hour is 60 minutes, how many minutes are in 9.4 days?
14000
In case of accidental contact with chemicals, how long should the eyes be flushed at the eyewash station?
15 minutes
What is the correct way to report the length of the rectangle in centimeters?
15.60cm
Suppose you are titrating an acid of unknown concentration with a standardized base. At the beginning of the titration, you read the base titrant volume as 1.19 mL. After running the titration and reaching the endpoint, you read the base titrant volume as 18.42 mL. What volume, in mL, of base was required for the titration?
17.23
In a melting point measuring experiment, the literature melting point for the standard is 180 -182 °C, and the experimental value is 178 - 180 °C. The experimental value of an unknown compound measured using the same instrument is 175-176 °C. What is the actual melting point of the unknown?
177 -178 °C
Consider the given graph of an object's mass and volume. What is the density of the object, in g/mL?
2
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?
2.7
Calculate the area of a rectangle in cm2 with a width of 6.5 cm and height of 3.1 cm. Be sure to include the proper number of significant figures.
20
Perform the calculation, rounding your answer to the proper number of significant figures. 0.867 + 3.72 + 18.0045 =
22.59
What is the correct reading of the volume in the pictured buret?
25.60 mL
A 24.5 g sample of solution has a density of 0.768 g/mL. What is the sample volume (in mL)?
31.9
Calculate the volume, in cubic centimeters, of a box which is 125 cm long, 37 cm wide, and 68 cm high. Report your answer with correct significant figures in cubic centimeters.
310000
Knowing that one day is 24 hours and one hour is 60 minutes, how many minutes are in 3.0 days?
4320
Identify which balance was used to make each mass reading.
5.43 g >>A balance with ±0.01 g tolerance 1.230 g >>A balance with ±0.001 g tolerance 6.539 g >>A balance with ±0.001 g tolerance 4.0000 g >>A balance with ±0.0001 g tolerance 0.90 g >>A balance with ±0.01 g tolerance
Perform the calculation, rounding your answer to the proper number of significant figures. 6.16 - 0.00086 =
6.16
Suppose you are measuring the mass of a solid sample on a balance using a weigh boat. You record the data in a table. Mass of weigh boat = 1.092 g Mass of weigh boat and sample = 7.683 g What is the mass of the solid sample (in g)?
6.591 grams
Using the letters on the image, identify each component of the Bunsen burner.
A >>Barrel B >>Air inlet C >>Gas inlet D >>Gas regulator
A calorie is defined as 4.184 J. This number
A calorie is defined as 4.184 J. This number is an exact number which means that it has infinite significant figures.
What information does not need to be included a chemical waste label?
A description of the experiment the chemicals were used for
After assembling a gravity filtration apparatus, begin the separation of a mixture by
After assembling a gravity filtration apparatus, begin the separation of a mixture by decanting it into the filter paper. Pour the entire contents of the mixture into the filter paper, stirring the solid in the filter paper if needed to speed up the filtration. After all the liquid has drained through the filter paper, finish by rinsing the solid with solvent.
What are the best practices for safely handling waste in the lab?
Always wear appropriate Personal Protective Equipment. Check labels or instructions before any disposal.
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
At the melting point, the solid form of a substance
At the melting point, the solid form of a substance is in equilibrium with the liquid form of the substance.
Determine whether or not each chemical formula is an empirical formula.
Ba3(PO4)2 >>Empirical formula CaCO3 >>Empirical formula C6H12O6 >>Not an empirical formula NaMnO4 >>Empirical formula K2C2O4 >>Not an empirical formula
What are the best practices while sharing a lab balance with other students?
Brush off any chemical dust around the balance after each use. Alert your TA or instructor about any issues with the balance.
Changing gloves often will minimize the spread of chemicals. To properly remove gloves, first,
Changing gloves often will minimize the spread of chemicals. To properly remove gloves, first, grasp the exterior of one glove with a gloved hand, and then, peel off the first glove . Then insert a bare finger between the interior edge of the second glove and the skin, and remove the second glove.
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.
What color is phenolphthalein when the solution is acidic?
Colorless
For each reaction, determine whether it is an example of combustion or not.
Combustion / Not Combustion
Complete the electron configuration of a calcium atom by selecting the correct orbitals.
Complete the electron configuration of a calcium atom by selecting the correct orbitals. 1s2 2s2 2p6 3s2 3p6 4s2
Identify the necessary parts to build a calorimeter.
Cover Thermometer An interior styrofoam cup An exterior styrofoam cup
A 7.298 g sample of copper reacts with oxygen, forming a copper oxide. The final mass of the copper oxide is 8.217 g. What is the formula of the copper oxide?
Cu2O
Determine whether each of the properties described applies to volumetric or graduated glassware.
Designed to measure one specific volume of liquid >>volumetric Capable of measuring a range of volumes of liquid >>graduated Used for applications in which great accuracy is needed >>volumetric
Identify the characteristics of a good recrystallization solvent.
Dissolves a chemical sample well at high temperatures. Does not dissolve a chemical sample well at low temperatures.
Determine each type of reaction.
Double replacement / Decomposition/ Combination/Single replacement/ Combustion
When using vacuum filtration to separate a dissolved solid from an undissolved solid, what techniques should you use to ensure a quantitative separation?
Dry the solid on the filter paper after the separation. Carefully rinse the flask into the filter funnel with a small amount of water. Wash the solid on the filter paper with a small amount of water. Wet the filter paper before pouring the mixture into the filter funnel.
How do you determine the last digit in any measured number?
Estimate one digit past the smallest precisely known digit or marking.
Determine whether each melting point observation corresponds to a pure sample of a single compound or to an impure sample with multiple compounds.
Experimental melting point is close to literature value >>Pure sample of a single compound Experimental melting point is below literature value >>Impure sample of multiple compounds Narrow melting point range >>Pure sample of a single compound Wide melting point range >>Impure sample of multiple compounds
What is the best course of action if solid material remains in the flask after the heating step of a recrystallization?
Filter the hot mixture.
In the reaction of magnesium metal with hydrochloric acid, how do you determine when the magnesium metal has reacted completely? Select all that apply.
Gas bubbles are no longer produced. The magnesium metal is gone.
Identify the step that is not recommended when responding to an emergency.
Gather your belongings.
If you drop or break glassware in lab, first _ Then, _. Finally, place all that material into the _.
If you drop or break glassware in lab, first get thick gloves or dustpan . Then, carefully collect all the broken glassware. Finally, place all that material into the broken glass container.
In order to dissolve a chemical sample in a recrystallization solvent, add the room-temperature solvent
In order to dissolve a chemical sample in a recrystallization solvent, add the room-temperature solvent just until it covers the sample in an Erlenmeyer flask on a hot plate. Turn on the heat, starting at a low setting and increasing gradually. Using a pipet, add additional solvent from a second container on the heat source. Swirl the sample flask after each addition, and try to add as little solvent as possible in order to dissolve the solid.
In the context of a balanced chemical equation, a
In the context of a balanced chemical equation, a subscript is a number to the lower right of an element or ion within formula and it applies to only the part of the formula it follows. A coefficient is a number to the left of a formula and it applies to the entire formula it precedes. Only coefficients should be added or changed when balancing chemical equations.
What should you do every time you are setting up glassware for a vacuum filtration?
Inspect the tubing for any holes. Ensure that the glassware is designed for use with a vacuum. Check that there are no cracks or defects in the glassware.
Magnesium reacts with oxygen in the air when
Magnesium reacts with oxygen in the air when lit with a Bunsen burner. Unlike other reactions, you should not look directly at this reaction.
Move to the safety shower if you spill hazardous chemicals on your
Move to the safety shower if you spill hazardous chemicals on your skin or clothing. Stand under the shower and pull the lever. Remove clothing and continue flushing the area for 15 minutes.
It is often helpful to remember the acronym PASS when using a fire extinguisher. Fill in the word that corresponds with each letter to complete the steps needed for operation of this device.
P: Pull the pin. A: Aim the nozzle at the base of the fire. S: Squeeze the lever slowly. S: Sweep the spray from side to side over the fire.
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
Identify the common indicators that a chemical reaction has occurred.
Precipitate being formed Bubbles being produced A color change A change in temperature
Consider the given plot of absorbance vs. concentration. Which line is the best-fit line to represent the black data points?
Red line (B)
What should you do every time before you leave the lab?
Remove your gloves. Wash your hands. Remove your labcoat, if you are wearing one.
Which formula is not an example of an ionic compound?
SO3
If crystal growth does not start on its own after the solution in the flask returns to room temperature, identify the best ways to promote this process.
Scratch the bottom of the flask gently with a stirring rod. Add a bit of solid as a seed crystal.
How should spill cleaning materials be discarded?
Seal in a labeled plastic bag, then place in the solid waste container.
What characteristics should a good sample for melting point determination have?
Solid phase Thoroughly dry Small particles
Which property is the basis of the purification technique recrystallization?
Solubility
The Law of Conservation of Energy states that
The Law of Conservation of Energy states that no energy can be created or destroyed, only transferred or transformed. An example of the Law in the laboratory is the water in a calorimeter absorbing heat given off by a reaction or hot object.
Determine whether each observation generally corresponds to a physical change or a chemical change.
The color of a substance changes over time. >>Chemical change Bubbles are produced upon mixing two solutions. >>Chemical change A precipitate is formed from two solutions. >>Chemical change A solid dissolves into water. >>Physical change A solution heats up upon mixing with another. >>Chemical change A liquid freezes into a solid. >>Physical change
Identify the term that matches each description.
The energy needed to raise the temperature of 1 gram of a substance by 1°C >>Specific heat A measure of the amount of thermal energy in an object >>Temperature Energy that is transferred from one object to another >>Heat
Under what conditions should a student inform the instructor of a lab injury?
The instructor must be informed of all laboratory injuries.
Suppose that two students perform a titration experiment multiple times, resulting in the average concentrations reported here. Student A. 0.125 ± 0.008 M Student B. 0.12 ± 0.03 M
The more precise work was done by Student A because that student's data has a smaller standard deviation.
The pKa of an acid can be determined through
The pKa of an acid can be determined through titration with a strong base. Gradually increase the volume of the base, stopping after the equivalence point is reached. The pKa of the acid is equal to the pH at the midway volume to the equivalence point.
A sample of gas is subject to changes in conditions. Predict the effect of each change.
The pressure and the temperature are both decreased by 50%. What will happen to the volume? >>It will stay the same. The pressure and volume are increased. What will happen to the temperature? >>It will increase. The pressure is kept constant, while the temperature is decreased. What will happen to the volume? >>It will decrease. The volume and temperature remain constant, while some of the gas is let out of the container. What will happen to the pressure? >>It will decrease.
The purpose of the best-fit line on an experimental scatterplot is to
The purpose of the best-fit line on an experimental scatterplot is to identify any linear trend in scattered data. The best-fit line allows us to predict behavior between measured data using its slope.
The relationship between pressure and volume of a gas is
The relationship between pressure and volume of a gas is inverse so that as volume decreases, pressure increases.
To measure out a volume of liquid, start by choosing the appropriate graduated cylinder and moving the bumper to the
To measure out a volume of liquid, start by choosing the appropriate graduated cylinder and moving the bumper to the top of the graduated cylinder to protect it from breakage. Then, pour the liquid into the graduated cylinder until the bottom of the meniscus aligns with the desired volume marking when you look at the graduated cylinder from eye level.
To prepare a sample in a capillary tube for a melting point determination, gently tap the tube into the sample with the
To prepare a sample in a capillary tube for a melting point determination, gently tap the tube into the sample with the open end of the tube down. Continue tapping until the sample is a couple millimeters high. Then, with the closed end of the tube down, tap the sample down slowly or drop the tube into a longer tube to move the sample down faster. Finally, make sure that you can see some or all the solid in the magnifier when placed in the melting point apparatus before turning on the heat.
When an alarm sounds in the laboratory, it is important to respond
When an alarm sounds in the laboratory, it is important to respond calmly and remain quiet. Listen for any other instructions, turn off any equipment in use, and be prepared to leave immediately.
Determine when you should remove your goggles in the lab room.
When everyone in the room is done handling any chemicals or glassware
When taking a measurement with a pH meter, keep the instrument in the
When taking a measurement with a pH meter, keep the instrument in the storage solution until it is needed. Rinse the pH meter with deionized water and gently pat dry. Place the meter in the sample solution, and record the measurement when the pH stabilizes.
What is the equivalence point of a titration?
When the amount of acid and base are equal.
When should you start a new chemical waste container in the lab?
When the contents of the current container are a couple inches below the brim of the container
When using the Tare function on a balance, start by
When using the Tare function on a balance, start by placing the glassware on the balance. Then, press the Tare/Zero button to cancel out that mass. Finally, add your sample to the glassware and record the mass of your sample.
Hot filtration is a technique in which the mixture is heated and all the glassware is also heated for the filtration. When should you use the technique of hot filtration?
When you are separating a slightly soluble solid from an insoluble solid
What is the name of the compound with the formula of BF3
boron trifluoride
Identify the equipment best suited for extinguishing each type of fire. clothing fire _ large fire on floor _ small benchtop fire _
clothing fire _ fire blanket large fire on floor _ fire extinguisher small benchtop fire _ overturned beaker
Identify the safety equipment designed to deal with each emergency listed.
large fire on the benchtop >>fire extinguisher fire on a person >>fire blanket chemicals in eyes >>eyewash station chemicals on clothes >>safety shower cuts or minor burns >>first aid kit
Determine the best way to deal with each of the following items that may dangle into the way during lab work.
long hair long necklaces loose bracelets long earrings flowy sleeves
Most chemicals can be cleaned up with a general spill kit, but a few chemicals require specialized spill procedures. For each substance listed, determine whether a general spill kit is sufficient or if a specialized spill kit is needed.
methanol>>general acetone>>general hydrofluoric acid>>special phosphoric acid>>general mercury>>special
Given the pKa of each acid, determine whether it is strong or weak.
nitric acid, pKa=-2 >>strong sulfuric acid, pKa=-5 >>strong citric acid, pKa=3.1 >>weak acetic acid, pKa=4.7 >>weak