Qualitative analysis Questions and Answers

For the following reaction, 27.3 grams of bromine are allowed to react with 15.9 grams of chlorine gas. bromine (g) + chlorine (g) bromine monochloride (g) What is the maximum amount of bromine monochloride that can be formed? 39.4 What is the FORMULA for the limiting reagent? Br What amount of the excess reagent remains after the reaction is complete? 3.80

In a 5.00 L steel container at 575 K, the partial pressures of H₂(g) and O₂(g) are respectively 17.86 and 13.21 atm. The H₂(g) and the O₂(g) react together to produce H₂O(g). The final temperature remains at 575 K and the volume remains at 5.00 L. What is the final total pressure (in atm)?

Two catalysts may be used in a batch chemical process. Twelve batches were prepared using catalyst 1, resulting in an average yield of 86 and a sample standard deviation of 3. Sixteen batches were prepared using catalyst 2, and they resulted in an average yield of 89 with a standard deviation of 2. Assume that yield measurements are approximately normally distributed with the same standard deviation. Is there evidence to support a claim that catalyst 2 produces a higher mean yield than catalyst 1? Use a = 0.01. What is the type of test to be used? A F-test, two-tailed B z-test, left tailed C F-test, right-tailed D z-test, two tailed E F-test left tailed

What is the temperature change if 1.386 x 103 J is absorbed by 60.0 g of copper which has a specific heat capacity of 0.385 J/g °C? (ans. 60.0 °C)

Take a look at the follow graph. Describe the general effect on the solubility of ionic compounds with increasing of temperature. Soubility of select ionic compounds in g of salt in 100g of H2O versus temperature in C from 0 to 100C.

The specific heat capacity of zinc is 0.386 J/g °C. How many joules would be released when 454 grams of zinc at 96.0 °C were cooled to 28.0 °C? (ans. 1.19 x 104 J)

If 1.13 x 104 J of heat is added to a water sample and the temperature rises from 88.0 °C to its boiling point, what mass of water is in the sample? (ans. 225 g)

An instructor asks you to measure out 10.0 mL of a liquid. Which of the following glassware would work best? 5 types of classware: A) Erlenmeyer, B Graduated Cylinder, C) Pipet, D) beaker, E) Buret 25 types of classware: A) Erlenmeyer, B Graduated Cylinder, C) Pipet, D) beaker, E) Buret Buret and Pipet Buret and Beaker Graduated Cylinder and Pipet Graduated cylinder and buret Erlenmeyer and Beaker

Calculate the number of joules released when 75.0 grams of water are cooled from 100.0°C to 27.5°C.

Compare and contrast what happens to a Gram-positive bacterial cell in a hypotonic environment with what happens to a human cell placed in a hypotonic environment. If there are any major differences, please explain why.

The humoral immune response is primarily involved in producing: A. Antibiotics B. Antibodies C. Fever D. Inflammation E. Tc cells

Passive immunization means: A. A person develops immunity after an infection B. A person dies before he can develop immunity C. A person is given a shot containing antibodies D. A person is vaccinated against tetanus or influenza E. A person is vaccinated using a live virus vaccine

Balance the following redox reaction under basic conditions Cr³+ (aq) + CO₂(g) → Cr₂O72 (aq) + C₂04² (aq)

This disease is typically spread by zoonotic transmission: A. Carbapenem-resistant Enterobacteriaceae B. Hepatitis B C. Influenza D. Meningococcal meningitis E. Rabies

During the incubation period of disease, A. The pathogen is reproducing without any symptoms present B. The person feels some nonspecific symptoms C. The person is almost completely recovered from the disease D. The person is experiencing clear signs and symptoms of the disease E. The person is starting to feel better after the illness, but is still clearly sick

A newborn baby appears to be sick. A quick blood test reveals the presence of both IgG and IgM. Based on this, which of the following is true? A. The baby does not have an infection, since IgG and IgM are normal in a newborn B. The baby has an infection due to the presence of both IgM and IgG C. The baby has an infection due to the presence of lgG D. The baby has an infection due to the presence of IgM E. None of the above-it is not possible to predict based on this information

Oxidation of R₂CH-OH will produce a(an) no reaction carboxylic acid ketone aldehyde alkene

In general, which of the following microbes is the largest? A. Archaea B. Bacteria C. Helminths D. Protozoa E. Viruses

Fomites are involved in which kind of transmission? A. Direct contact B. Indirect contact C. Sexual D. Vector E. Vehicle

The most common reactions involving aromatics are addition elimination reduction oxidation substitution reactions.

Which of the following is an important and practical method of preventing nosocomial infections in a hospital? A. Do not allow any visitors to people staying for more than one day B. Eliminate all diseases from society C. Prevent babies and the elderly from entering the hospital D. Quarantine or separate patients who have serious communicable infections E. Require everyone entering the hospital to take broad-spectrum antibiotics

n the compound propene, C₂H=CH-CH3, the single bond between two carbon atoms is Shorter than the double bond. stronger than the double bond. longer than the double bond. equal to the double bond in bond strength.

When catalyzed by the enzyme, sucrase, sucrose decomposes to yield glucose and fructose. The reaction is hydrolysis fermentation. denaturation. esterification.

Which compound is a tertiary alcohol? 2-methyl-1-hexanol 3-hexanol 1-propanol 3-methyl-2-hexanol 2-methyl-2-hexanol

Which of the following molecules would be classified as a ketone? CH3CH2CH(CH3)CH(OH)CH3 HCH2CH2CH2CH2CHO CH3CH2CCH2CH3 CH3CH2CH2CHO

The generic formula for an alkane, aliphatic hydrocarbon is CnH2n+2. Which formula below, corresponds to propane? C3H9 C3H8 C3H6 C2H6

Carbohydrates are a combination of carbon, hydrogen, and oxygen in an approximate ratio of 1:1:1 2:1:2 1:2:1 3:2:1

Rubbing alcohol is methyl alcohol phenol Oethyl alcohol isopropyl alcohol

For each mixture of two solutions in water, what precipitate(s) will form? If no precipitate will form, write "none". KCI and AgNO3: Na3PO4 and CaBr₂: MnCl₂ and NaOH: Pb(C₂H3O2)2 and H₂SO4:

If 76.1 grams of NaCl are dissolved in 34.0 mL of Sulfuric acid (sulfuric acid has a density of 1.84 gram per mL), calculate the following concentration measures. a. Weight/volume percent b. Weight/weight percent c. Molarity

A 230. mL sample of a 0.275 M solution is left on a hot plate overnight; the following morning the solution is 1.10 M. What volume of solvent has evaporated from the 0.275 M solution? 288 mL 230 mL 63.3 mL 58.0 mL 172 mL

You are supposed to dissolve a small amount of Cu solid metal in HCl (aq). Based on your observation you would be able to determine if copper metal dissolved in this acid. Using standard reduction potential table predict whether Cu metal and Ni metal will dissolve in HCl acid. Write appropriate reduction and oxidation reactions, use standard reduction potential values to support your answer.

In which choice are the 0.1 M aqueous solutions of salts below ranked according to decreasing pH? NH4Br, NaBrO2, NaBr, NaClO2 (a) NaBr>NaBrO2> NaClO2>NHBr (b) NH4Br > NaBrO₂ > NaBr > NaClO2 (c) NaBrO₂> NaClO₂ > NaBr > NH4Br (d) NaBrO₂> NH4Br > NaClO2 > NaBr

Free radicals None of these responses is correct. can donate electrons to DNA. donate electrons to antioxidants. are only found in foods that contain protein. can be neutralized by antioxidants. can only be neutralized by polyphenols.

Imagine yourself being a chef of a restaurant. You prepare a variety of food, all of which contains protein. What agent is used to denature the protein in the following dishes? Charcoal BBQ chicken Marinated beef Meringue Steak tartare (raw chopped beef) Salt pork

Let's revisit your answer to the question from before. What do you think now? Let's say you wanted to calculate the density of a liquid to see if it will float on top of water. The mass of the liquid is 5.5 grams, and the volume of the liquid is 26 mL. If density is mass divided by volume, which of the answers below would be correct? Select all that apply. 0.21 0.211 0.2 0.21153

At 25 °C and 1.0 atm pressure, what is the minimum quantity of dry air needed to combust 1.3 L of CH4 (g) comp to CO₂(g)? Remember that oxygen is present in the atmosphere to the extent of 209,480 parts per million.

A triacylglycerol is reacted with water and a strong acid to yield glycerol and three fatty acid molecules. Identify the reaction type. Saponification Hydrolysis Hydrogenation Esterification I DON'T KNOW YET

Calculate the lattice energy of ionic solid MX, given the following thermodynamic data: M(s) + 1/2 X2(g) → MX(s) ΔHran-695. kJ ΔHran= 91. kJ M(s) → M(g) Bond energy of X2 = 178. kJ/mol lonization energy for M(s) = 426. kJ/mol Electron affinity of X = -279. kJ/mol

A solution is made by dissolving 2.15 g glucose (C6H12O6) in enough water to make 102.1 mL of solution. Calculate the molarity of this solution. HOW DO WE GET THERE? What are the moles of C6H12O6 present?

Calculate the mass of solid KCl that must be added to 1.62 L of a 0.229 M Pb(NO3)2 solution to precipitate all the Pb2+ ions in the form of PbCl2. What mass of KCl is required?

What mass of precipitate (in g) is formed when 20.5 mL of 0.800 M Co(NO3)2 reacts with 18.5 mL of 0.800 M NaOH in the following chemical reaction? Co(NO3)2(aq) + 2 NaOH(aq) → Co(OH)₂(s) + 2 NaNO3(aq)

Phthalonitrile (C8H4N2) is produced by the ammoxidation of o-xylene (C8H10) according to the following reaction: C8H10(l) + O2(g) + NH3(g) → C8H4N2(S) + H₂O(l) How many grams of water would be produced by the complete ammoxidation of 20.8 moles of o-xylene?

For the reaction shown, compute the theoretical yield of the product (in grams) for each initial amount of reactants. Ti+2F₂->TiF4 a) 5.0 g Ti. 5.0 g F₂ b) 2.4 g Ti, 1.6 g F c) 0.233 g Ti, 0.288 g F₂

Zinc(II) sulfide reacts with oxygen according to the reaction: 2ZnS+3O₂->2ZnO +2SO₂ A reaction mixture initially contains 4.2 mol ZnS and 6.8 mol O₂. Once the reaction has occurred as completely as possible, what amount (in moles) of the excess reactant is left?

A student started with 1.525 grams of copper (II) oxide and produced 3.500 g of copper (II) sulfate. What is the percent yield? The product is a hydrate. Use appropriate significant figures. Do not put a percent sign in the answer box. Please ignore extra zeros that will be automatically added to your answer by the system. Useful information: chemical equation: CuO(s) + H₂SO4 (aq)---> CuSO4 (aq) +H₂O(l) Formula weight of hydrated copper (II) sulfate = 249.677 g/mol Formula weight of copper (II) oxide = 79.545 g/mol

There were originally 3000 bacteria in a petri dish. The doubling time is 4 hours. How many bacter will there be in 10 hours? A city's population is growing at 2.5% a year. What is its approximate doubling time? A city's population is growing at 2.5% a year. What is its exact doubling time rounded to two decimal places?

(CH₂(CH₂)6 CH₂) reacts with gaseous oxygen gas (O₂) to produce gaseous carbon dioxide (CO₂) and gaseous water ( (H₂O). If 4.18 g of water is produced from the reaction of 8.00 g of octane and 12.9 g of oxygen gas, calculate the percent yield of water. Round your answer to 3 significant figures.

Consider this reaction: 2H2(g) + O2(g) → 2H₂O(1) ΔHrxn = -484 kJ Calculate the enthalpy change for the formation of 100.0 g water.

What volume of oxygen gas is produced when 68.6 g of mercury(II) oxide reacts completely according to the following reaction at 25 °C and 1 atm? mercury(II) oxide (s) ---> mercury (l) + oxygen(g)