Chem lab final

face centered

4 atoms (corners, face, center)

formal to find the atomic radius

4/3 x pi x radius^3

If A has 3 atoms and B has 2 atoms what is the formula

A3B2

cathode

OA

anode

RA

All of the solutions prepared in the solubility experiment should be

discarded in the waste container

density

mass/volume

When cleaning the wire between flame tests, most of the cleaning is accomplished when? while rinsing the wire with acid while heating the wire in the flame

while rinsing the wire with acid

simple cubic

1 atom (corners)

body centered

2 atoms (corners and center)

Choose the chemical in this experiment that has irritating vapors. 3 M HCl all the oxidizing agents all the reducing agents KMnO4

3 M HCl

Find the wavelength frequency and energy of Mg. (5192 A, 1A=1e-10)

5192, 5.78e14, 3.83e-19

What should be done with the waste from the Acid-Base Studies experiment? All solutions must be placed in the labeled waste container. All solutions can be flushed down the sink with plenty of water. Basic solutions can be flushed down the sink with water but the acidic solutions must be placed in the labeled waste container. No waste solutions will be generated in this lab. Acidic solutions can be flushed down the sink with water but the basic solutions must be placed in the labeled waste container.

All solutions can be flushed down the sink with plenty of water.

What should be done with waste materials in the Qualitative Analysis experiment? (Select all that apply.) Liquid wastes can be flushed down the sink. Solid wastes can be flushed down the sink. During the experiment, wastes should be kept in a beaker at the bench. All wastes should be put in the container on the side shelf. After the beaker is emptied, it should be rinsed with a little water, and the rinsings should be poured into the container. During the experiment, wastes should be kept in a labeled beaker at the bench.

All wastes should be put in the container on the side shelf. After the beaker is emptied, it should be rinsed with a little water, and the rinsings should be poured into the container. During the experiment, wastes should be kept in a labeled beaker at the bench.

Write balanced net ionic equation Ca(OH)2

Ca2+ + 2OH- → Ca(OH)2

Based on extrapolation of your lab results, write the dissolution reaction for the ionic solids below. (Use the lowest possible coefficients. Include states-of-matter under the given conditions in your answer.) (a) Cr(ClO4)3

Cr(ClO_4)_3(s)-->Cr^3+(aq)+3ClO_4^-(aq)

write equation of vinegar (acetic acid, HC2H3O2)

HC2H3O2 + H2O → C2H3O2-+H3O+

In the experiment on Le Châtelier's Principle, why must one be very careful when handling concentrated hydrochloric acid (12 M HCl)? (Select all that apply.) It is very expensive, and should not be wasted. Its vapor is a respiratory irritant, so it should be used in a fume hood. It is a known human carcinogen. It is flammable and explosive. It is highly corrosive, and can injure the eyes and skin.

Its vapor is a respiratory irritant, so it should be used in a fume hood. It is highly corrosive, and can injure the eyes and skin.

How should accidents be prevented when working with the reactions that produce hydrogen gas, which is flammable? Keep reactions away from ignition sources, and rinse metal before discarding it. Do not work with the reactions in an atmosphere that contains oxygen. Do not work with the reactions in an atmosphere that contains nitrogen. Do not expose the reducing agents to water or acid.

Keep reactions away from ignition sources, and rinse metal before discarding it.

write equation of ammonia (NH3)

NH3 + H2O → NH4++OH-

If one spills hydrochloric acid on one's hands, what is the FIRST thing one should do? Die on the spot. Go to the instructor for help. Find sodium bicarbonate solution to neutralize the acid. Rinse them in running water. Leave the lab for fresh air.

Rinse them in running water.

When working with a Bunsen burner, which of the following precautions must be observed? (Select all that apply.) The burner must never be left unattended. The area above the burner must be clear before it is lit. The area near the burner should be clear of paper and other flammables. Flammable liquids should never be heated with a Bunsen burner. The burner must never be used in the presence of oxygen. The burner must never be used to heat metal. The substance being heated should never be pointed at people. If the flame blows out, the gas must be turned off, because gas could accumulate and an explosion could occur.

The burner must never be left unattended. The area above the burner must be clear before it is lit. The area near the burner should be clear of paper and other flammables. Flammable liquids should never be heated with a Bunsen burner. The substance being heated should never be pointed at people. If the flame blows out, the gas must be turned off, because gas could accumulate and an explosion could occur.

What should be done with all waste generated in the titrations lab? They should be sent to the cafeteria for recycling. They should be thrown in the trash can. They should be disposed of in the labeled container. There will be no waste material in this experiment. They should be flushed down the sink with plenty of water.

They should be flushed down the sink with plenty of water.

While working on the Equilibrium and Le Châtelier's Principle experiment, wastes from Part A and B should be kept in the following way. They should be kept in a beaker at the bench. They should be kept in the dark so they don't degrade. They should be left in the cuvettes. They should be kept in a labeled beaker at the bench.

They should be kept in a labeled beaker at the bench.

What should be done to avoid exposure to the vapors? Keep a damp cloth over the nose and mouth to capture the vapors. Work with it under a hood and avoid inhaling the vapors. Wear a dusk mask. Keep the container it is in closed at all times.

Work with it under a hood and avoid inhaling the vapors.

Select all of the following that are listed as corrosive. (Select all that apply.) acetic acid (HC2H3O2) ammonia (NH3) hydrochloric acid (HCl) sodium hydroxide (NaOH) water (H2O)

acetic acid (HC2H3O2) ammonia (NH3) hydrochloric acid (HCl) sodium hydroxide (NaOH)

Twisting the sleeve to open the holes (baffles) above the base of the burner does which of the following? has no effect on the color of the flame regulates the water flow regulates the gas flow allows more air (oxygen) into the flame

allows more air (oxygen) into the flame

In the lab, a student must wear safety glasses or goggles... unless he/she has contact lenses. unless they bother him/her. only when he/she is performing experiments. at all times. unless he/she has standard eyeglasses.

at all times

Select all of the following which might give off highly irritating vapors. (Select all that apply.) acetic acid (HC2H3O2) ammonia (NH3) hydrochloric acid (HCl) sodium hydroxide (NaOH) water (H2O)

cetic acid (HC2H3O2) ammonia (NH3) hydrochloric acid (HCl)

Determine mmol of titrant and analyte

concentration * volume of that solution, take that answer and multiple/divide by the ratio

Sodium hydroxide (NaOH) is listed as which of the following? corrosive irritating vapors toxic if ingested causes staining on skin flammable none listed

corrosive

The chemical solutions in this experiment are If any of them splash into your eyes, you should first Your lab partner or another student should then If the solutions spill on your skin or clothing, you should immediately When working with the hotplate, which of the following precautions should be taken? (Select all that apply.) Keep flammable materials (including paper, hair, and clothing) away from it. Remember that it will stay hot after it's turned off — check before touching it. Avoid turning it up hot enough to boil water. Correct: Your answer is correct.

dilute but corrosive. flush them in the eyewash. notify your instructor about any accidents. flush the area with water. Keep flammable materials (including paper, hair, and clothing) away from it. Remember that it will stay hot after it's turned off — check before touching it.

Absences in CH102 are excused for... documented illness. oversleeping. Halloween parties. documented university activities. mild sniffles, coughs, or headaches. documented death in immediate family. documented court appearances.

documented illness, documented university activity, documented death in immediate family, documented court appearence

The purpose of CH102 is to... a) explore some basic chemical concepts. b) follow the content of the lecture course on a day-to-day basis. c) keep students busy when they could be napping. d) provide a lab grade for inclusion in the CH101 lecture course. e) reinforce the content of CH101 with hands-on experience.

explore some basic chemical concepts. reinforce the content of CH101 with hands-on experience.

If 12 M HCl is splashed onto the eyes or skin, what is the proper response? First: Neutralize the acid with a sodium bicarbonate solution. Flush the affected area with a lot of water. Notify the instructor about the accident.

flush the affected area

(d) If any of these get in your eyes, what is the proper response? First: Notify the instructor about the accident. Neutralize the acid with a sodium bicarbonate solution. Flush the affected area with a lot of water.

flush the affected area with a lot of water.

endothermic

heat is absorbed

exothermic

heat is released

In the flame test experiment, you will be working with two types of hazard. Which are they? (Select all that apply.) strong oxidizer hydride donor, pyrophoric explosive hydrochloric acid, corrosive solution carcinogen open flame

hydrochloric acid and open flamw

chem 102 is ____ chem 101

independent

Why should silver nitrate be handled carefully? (Select all that apply.) It is a suspected carcinogen. It is toxic. It is caustic and corrosive. It will cause dark spots where it contacts the skin.

it will cause dark spots where it contacts the skin.

mass percent

mass of acetic acid/mass of vinegar solution

sp

more than one pi bond, 180 (linear)

sp2

one pi bond, 120 (bent, trig planar)

sp3

only sigma bonds, 109 (tetrahedral, bent, trig pyramidal)

Proper attire for lab includes which of the following? (Select all that apply.) a) sandals b) pants that extend to the ankles c) shoes that cover the heels and toes d) tank tops e) shorts f) flowing robes g) a shirt that covers the shoulders and extends about 6" below the waist h) a shirt and pants that overlap about 6" in the middle to cover the torso i) a shirt with long, loose sleeves j) crop tops and hip hugger jeans

pants that extend to the ankles. shoes that cover the heels and toes, a shirt that covers the shoulders and extends about 6" below the waist, a shirt and pants that overlap about 6" in the middle to cover the torso

if the ksp is greater than 0 then the preference is in the

product

if the ksp is less than 0 then the preference is in the

reactant

roygbiv

red, orange, yellow, blue, indigo, violet

ased on the trends observed in lab, identify the ionic solids below as soluble or insoluble in water. (a) Pb(ClO4)2 (b) Pb3(PO4)2 (c) Pb(OH)2 (d) Na3PO4

soluble, insoluble, insoluble, soluble

Because acid-base reactions are highly exothermic, which of the following should you NOT mix together? solutions with concentrations less than 0.1 M any two basic solutions solutions with concentrations greater than 0.1 M any two acidic solutions any acidic solutions with any basic solutions any acidic or basic solution with water

solutions with concentrations greater than 0.1 M

The valve on the bottom of the burner controls which of the following? the gas flow the water flow the air flow the color of the flame

the gas flow

What is the hottest part of a Bunsen burner flame? the tip of the inner, dark blue cone the top of the visible portion of the flame just above the top of the visible portion of the flame the bottom of the flame, at the burner outlet

the tip of the inner, dark blue cone

What should be done with the wastes in the Flame Test experiment? They should be disposed of in the labeled container. They should be thrown in the trash can beneath the sink. They should be flushed down the sink with plenty of water. They should be ignored, because there will be no waste material in this experiment.

they should be flushed down the sink with plenty of water

what color has the most energy in roygbiv

violet