Chem 1045 Study Guide
Any other hazards present in the lab. Any chemicals involved in an incident. How the incident happened.
Identify the types of information that are necessary to communicate with emergency responders.
grasp the exterior of one glove with a gloved hand, peel off the first glove, a bare finger
Changing gloves often will minimize the spread of chemicals. To properly remove gloves, first, ... , and then, ... . Then insert ... between the interior edge of the second glove and the skin, and remove the second glove.
Use your hand to gently waft the smell toward you.
In lab, you may need to evaluate the odor or smell of a chemical. What is the best way to smell a chemical sample?
Pull, aim, squeeze, sweep
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: ... the pin. A: ... the nozzle at the base of the fire. S: ... the lever slowly. S: ... the spray from side to side over the fire.
lit with a Bunsen burner, look directly at
Magnesium reacts with oxygen in the air when ... . Unlike other reactions, you should not ... this reaction.
your lab partner
Which is NOT a good source of information about the hazards that affect waste disposal in a chemistry lab?
the added solid settles to the bottom after mixing and allowing to settle, a clear line appears between the added liquid and water after mixing and allowing to settle, the combination of the solute and water appears cloudy after mixing and allowing to settle
Observations that indicate an added solute is insoluble in water
shift the iron-thiocyanate equilibrium to the reactant side; it removes iron from the iron-thiocyanate equilibrium mixture
Consider the two reactions of iron ions, one with thiocyanate (SCN−SCNX−) ions and one with chloride (Cl−ClX−) ions. Fe3++SCN−−⇀↽−FeSCN2+FeX3++SCNX−↽−−⇀FeSCNX2+Fe3++4Cl−−⇀↽−FeCl4−FeX3++4ClX−↽−−⇀FeClX4X− If you create an equilibrium mixture from Fe3+FeX3+ and SCN−SCNX− ions, adding Cl−ClX− ions will... because ...
false. true. false. true
Determine if the statements are true or false. Chewing gum is okay in the lab as long as you don't blow bubbles. Tobacco products of all kinds are prohibited in lab. Beverages are allowed in lab as long as they are in containers with lids. Food items should not be brought into the lab.
remove. tie back or secure. remove. tie back or secure. remove.
Determine the best way to deal with each of the following items that may dangle into the way during lab work. loose bracelets ... flowy sleeves ... long earrings ... long hair ... long necklaces ...
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.
Determine the safest option in the lab if you need your vision to be corrected.
Before handing any glassware or chemicals for the experiment.
Determine when to put on disposable gloves for work in the lab.
When everyone in the room is done handling any chemicals or glassware.
Determine when you should remove your goggles in the lab room.
solid waste container, nalgene bottle with cap, box lined with puncture resistant bag, sharps container
Determine where to dispose of each type of waste. unused solid reagent ... titrant solution ... broken flask ... syringe tips ...
Neutralize the spill before cleaning it up.
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?
top, bottom, eye level
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 ... ... .
always wear appropriate ppe. check labels or instructions before any disposal.
What are the best practices for safely handing waste in the lab?
alert your TA or instructor about any issues with the balance. brush off any chemical dust around the balance after each use.
What are the best practices while sharing a lab balance with other students?
a description of the experiment the chemicals were used for
What information does not need to be included in a chemical waste label?
Personal protection and first aid recommendations, hazard warnings, handling, storage, and reactivity information, identification and description of substance
What information is necessary to review in order to be considered familiar with the Safety Data Sheet (SDS) of a substance?
Remain calm and quiet, gather information, and assess the situation.
What is the first step for response to an emergency situation?
placing the glassware on the balance, press the Tare/Zero button, add your sample to the glassware
When using the Tare function on a balance, start by ... . Then, ... to cancel out that mass. Finally, ... and record the mass of your sample.
Make sure that the meniscus starts exactly at 0.00 mL.
What practice will not help you make an accurate volume reading on a buret at the beginning of a titration?
endothermic, endothermic, exothermic, exothermic
Determine whether each description corresponds to an endothermic reaction or an exothermic reaction. The reaction mixture feels cool from the outside... Heat is a reactant in the reaction... Heat is a product in the reaction... The reaction mixture feels warm from the outside...
chemical, physical, physical, chemical, chemical, chemical
Determine whether each observation generally corresponds to a physical change or chemical change. The color of a substance changes over time ... A solid dissolves into water ... A liquid freezes into a solid ... A solution heats up upon mixing with another ... A precipitate is formed from two solutions ... Bubbles are produced upon mixing two solutions ...
skin or clothing, pull, 15 minutes
Move to the safety shower if you spill hazardous chemicals on your ... . Stand under the shower and ... the lever. Remove clothing and continue flushing the area for ... .
safety equipment signs, sign prohibiting food and drink, chemical storage signs
What signs are typically posted in areas of active lab work?
a hazy or cloudy appearance, solid settling out in the test tube
What visible signs indicate a precipitation reaction when two solutions are mixed?
calmly, quiet, equipment
When an alarm sounds in the laboratory, it is important to respond ... and remain ... . Listen for any other instructions, turn off any ... in use, and be prepared to leave immediately.
The rate of the forward reaction equals the rate of the reverse reaction. Reactants and products are both present in the reaction mixture. The amounts of reactants and product has stopped changing.
When any reversible reaction is at equilibrium, what conditions are necessarily true?
Check and see if anyone else can use the chemical. If not, discard in the proper waste container.
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?
Move the buret clamp to a ring stand with a larger base.
After clamping a buret to a ring stand, you notice that the set-up is tippy and unstable. What should you do to stabilize the set-up?
The instructor must be informed of all laboratory injuries.
Under what conditions should a student inform the instructor of a lab injury?
Leave the gas cock open for a few minutes before lighting to clear the line.
What action is not necessary before lighting a Bunsen burner?
visually check that the gas cylinder is restrained but keep a safe distance from it
what is the main precaution to take if a Gas Cylinder sign is present in the lab?
the reactants, the products
According to Le Chatelier's Principle, heat applied to an exothermic reaction will shift the reaction towards .... Heat applied to an endothermic reaction will shift the reaction towards ... .
Seal in a labeled plastic bag, then place in the solid waste container.
How should spill cleaning materials be discarded?
a change in temperature, precipitate being formed, a color change, bubbles being produced
Identify the common indicators that a chemical reaction has occurred.
Kc=[Cu(NO3)2]/[AgNO3]^2
Identify the correct equation for the equilibrium constant kc for the reaction: Cu(s)+2AgNO3(aq)−⇀↽−Cu(NO3)2(aq)+2Ag(s)
Do not block a door with an EXIT sign. Locate the exits prior to the start of lab.
Identify the precautions to take with exits in the lab.
hazards identification. exposure controls/personal protection. first aid measures. identification. handling and storage.
Identify the section in which each type of information can be found on a Safety Data Sheet. possible dangers and health effects ... recommended personal protective equipment (PPE)... recommendations in case of accidental contact with the chemical ... chemical name and formula ... incompatibility or reactivity with other chemicals ...
get thick gloves or dustpan. carefully collect all the broken glassware. broken glass container.
If you drop or break glassware in lab, first ... . Then, ... . Finally, place all that material into the ... .
15 minutes
In case of accidental contact with chemicals, how long should the eyes be flushed at the eyewash station?
23.21
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 2.59 mL. After running the titration and reaching the endpoint, you read the base titrant volume as 25.80 mL. What volume, in mL, of base was required for the titration?
not a sign of a chemical reaction, the undissolved solid is not a new sbstance
Suppose you mix a solid into water and not all of it dissolves. This is ... because ...
a sign of a chemical reaction, chemical changes can release heat
Suppose you mix two solutions in a test tube and the test tube become hot. This is ... because ...
[CoCl4]^2-, Fe^3+
The equilibria studied in the lab procedure include which two reactants?
safety equipment signs, sign prohibiting food and drink, ppe sign, chemical storage signs
Which signs are typically posted in areas of active lab work?
color or temperature change of a substance, mass or volume of reagents used, length of time a substance is heated on a hot plate, appearance of gas bubbles during a chemical reaction
Which types of observations are necessary to record in a lab notebook?
Hazard signs such as "flammable," "oxidizer," and "corrosive"; national fire protection association (NFPA) diamond; gas cylinder sign
Which types of signs are posted to convey information about chemical storage?
solution, solute, solvent, concentration
a liquid consisting of one substance dissolved in another ... a chemical that is dissolved ... a liquid that dissolves another substance ... a value used to describe the amount of one substance dissolved in another ...
physical, physical, chemical, physical, chemical, physical
determine whether each property is a physical property or a chemical property. melting point... color... reactivity... density... flammability... solubility...
non-metal, metal, metal, non-metal, metalloid, metal, metalloid, metal, non-metal
identify each element as a metal, non-metal, or metalloid sulfur.... tin... titanium... fluorine... silicon... silver... germanium... manganese... phosphorus...
melting, sublimation, condensation, vaporization, freezing, deposition
identify the name of the phase change corresponding to each transition. solid to liquid ... solid to gas ... gas to liquid ... liquid to gas ... liquid to solid ... gas to solid ...
a 50 mL graduated cylinder with markings at every 10 mL, a 25 mL graduated cylinder with markings every 1 mL, a 10 mL graduated cylinder with markings every 0.1 mL
Choose the best graduated cyliner to make each measurement in a single use. 36 mL of water ... 18.5 mL of a NaCl solution ... 5.75 mL of a sucrose solution ...
graduated, volumetric, volumetric
Determine whether each of the properties described applies to volumetric or graduated glassware. Capable of measuring a range of volumes of liquid. ... Designed to measure one specific volume of liquid ... Used for applications in which great accuracy is needed ...
absorbent material, plastic bag, solid waste container, detergent and water
Fill in the words to complete each step in liquid spill cleanup. 1. Surround the area with ... , then cover the spill. 2. Scoop up the material and place in a ... . 3. Place the bagged waste in a ... . 4. Wipe down the area with ... .
general. special. special. general. general.
For each substance listed, determine whether a general spill kit is sufficient or if a specialized spill kit is needed. methanol ... mercury ... hydrofluoric acid ... acetone ... phosphoric acid ...
gloves, closed-toe shoes, lab coat, goggles
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 ... While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand and onto the floor ... While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench ... While checking on a stirring solution, the solution splashes up towards your face ...
Close the bottle. Return the bottle to its proper storage location.
What should you do after finishing work with a reagent bottle?
wash your hands, remove your labcoat if wearing one, remove your gloves
What should you do every time before you leave the lab?
Turn off the gas cock for 10 seconds before trying again.
What should you do if your Bunsen burner does not light after a few tries with the striker?
When the contents of the current container are a couple inches below the brim of the container.
When should you start a new chemical waste container in the lab?
The forward reaction rate is equal to the reverse reaction rate.
Which statement is true about a chemical reaction?