Qualitative analysis Questions and Answers

The following molecular equation represents the reaction that occurs when aqueous solutions of silver(I) nitrate and manganese(II) iodide are combined. 2AgNO3 (aq) + MnI₂ (aq) —2AgI (s) + Mn(NO3)2 (aq) Write the balanced net ionic equation for the reaction.

Express the composition of each of the following compounds as the mass percents of its elements. a. acetone, C3H6O Mass% C = Mass% H= Mass% O = b. glycerol, C3 Hg O3 Mass% C= Mass% H = Mass% 0 =

A solution was prepared by mixing 60.00 mL of 0.100 M HNO3 and 180.00 mL of 0.200 M HNO3. Calculate the molarity of the final solution of nitric acid.

Freon-12 (CCl₂F₂) is used as a refrigerant in air conditioners and as a propellant in aerosol cans. alculate the number of molecules of Freon-12 in 5.90 mg of Freon- What is the mass of chlorine in 5.90 mg of Freon-12?

Nickel (Ni) is a metal that is added to steel to improve its resistance to corrosion. Calculate both the number of moles in a sample of nickel containing 8.39 × 10^20 atoms and the mass of the sample.

The next step is to see if an insoluble product can form from the ions available. We do this by xchanging or "crossing" the ions in the reactants. This gives Ag2CO3 and KNO3. Are either of these insoluble? Ag¹(aq) + NO3 ¯(aq) + K*(aq) + CO3 ²¯(aq) → (Select all that apply.) KNO3 Ag2CO3

Which of the statements below is NOT part of the scientific method? observation and measurement testing of a hypothesis by experimentation refinement of a hypothesis as needed formation of a hypothesis All of the above steps are part of the scientific method.

What volume of 0.100 M Na3PO4 is required to precipitate all the lead(II) ions from 200.0 mL of 0.400 M Pb(NO3)2?

Si Br(l) + 2Ba(s) → 2BaBr₂ (s) + Si(s) Reducing Agent Substance Oxidized Substance Reduced Be(OH)2 (aq) → BeO₂ (aq) + 2H₂O(1) Oxidizing Agent Reducing Agent Substance Oxidized Substance Reduced

What volume of each of the following acids will react completely with 50.00 mL of 0.100 M NaOH? a. 0.150 M HCl Volume = b. 0.250 M HNO3 Volume = mL Volume = mL c. 0.100 M HC₂H3 O₂ (1 acidic hydrogen) mL

Salespeople often deal with hundreds of different people and firms over time is indicative of which reason to choose a career in sales. a. Freedom b. Job challenge c. Rewards d. Opportunities of advancement

Write the net ionic equation for the precipitation of magnesium sulfide from aqueous solution.

Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand notation as KHP. If 2.59 grams of KHP are needed to exactly neutralize 23.0 mL of a potassium hydroxide solution, what is the concentration of the base solution?

Consider the balanced equation: 2CH4 + 40₂ → 2CO₂ + 4H₂O If 2.50 mol of each reactant is mixed together, how many moles of CO2 will be produced? a. 2.50 b. 5.00 c. 1.25 d. 4.00 e. 2.00

An aqueous solution of sodium hydroxide is standardized by titration with a 0.128 M solution of hydrochloric acid. If 28.9 ml of base are required to neutralize 23.1 mL of the acid, what is the molarity of the sodium ydroxide solution

The compound potassium hydroxide is a strong electrolyte. Write the reaction when solid potassium hydroxide is put into water:

An aqueous solution of potassium hydroxide is standardized by titration with a 0.137 M solution of nitric acid. If 11.9 mL of base are required to neutralize 26.1 mL of the acid, what is the molarity of the potassium hydroxide solution?

1. How many ATOMS of phosphorus are present in 4.75 moles of phosphorus trichloride ? 2. How many MOLES of chlorine are present in 6.13×1022 molecules of phosphorus trichloride ?

1. How many MOLECULES of boron trifluoride are present in 2.07 grams of this compound? 2. How many GRAMS of boron trifluoride are present in 1.08×1023 molecules of this compound?

What is an evenly distributed, uniform mixture called? A. A homogeneous mixture B. An ionic solid C. A heterogeneous mixture D. A compound

For the following reaction, 6.02 grams of oxygen gas are mixed with excess carbon (graphite). The reaction yields 5.52 grams of carbon dioxide. carbon (graphite) (s) + oxygen (g) carbon dioxide (g) What is the theoretical yield of carbon dioxide ? What is the percent yield for this reaction ?

A compound is found to contain 39.12 % carbon, 8.772 % hydrogen, and 52.11 % oxygen by mass. QUESTION 1: The empirical formula for this compound is_____? QUESTION 2: The molar mass for this compound is 92.11 g/mol. The molecular formula for this compound is______? .

For the following reaction, 6.53 grams of iron(II) chloride are mixed with excess silver nitrate. The reaction yields 8.37 grams of iron (II) nitrate. iron(II) chloride (aq) + silver nitrate (aq) → iron(II) nitrate (aq) + silver chloride (s) What is the theoretical yield of iron(II) nitrate? What is the percent yield of iron(II) nitrate?

The decomposition of 3.82 g NaHCO3 yields 1.78 g Na₂CO3. What is the percent yield of this reaction? 2 NaHCO3(s) → Na₂CO3(s) + CO₂(g) + H₂O(g) 73.9 % 63.1 % 23.3 % 46.6 % 100 %

A compound is found to contain 26.94 % nitrogen and 73.06 % fluorine by mass. What is the empirical formula for this compound?

You are given a compound with the formula MCl2, in which M is a metal. You are told that the metal ion has 27 electrons. What is the identity of the metal? A)Al B)Cu C)Ga D)Ni E)Co

A gas has a volume of 1400 milliliters at a temperature of 20 K and a pressure of 1.0 atm. What will be the new volume, in mL, when the temperature is changed to 40 K and the pressure is changed to 0.50 atm?

Sometimes sea shells can be found in strange places. Like deserts and on mountains. Other than plate boundaries moving what is another reason for this? A)The earth's tilt on its axis has changed over the years and the equator use to be farther south B)Plate boundary movement is the only correct explanation for marine fossils in strange places C)Sea levels use to be much lower D)The sea levels use to be much higher and covered most of the land on earth. So marine fossils are found inplaces far from water

A drug company claims that an allergy medication causes headaches in 5% of those who take it. A medical researcher believes it is not true that 5% of those who take the drug actually get headaches. a. Identify the population. 1)the proportion of those who take the drug who get a headache. 2)all responses of individuals who take the medication. 3)more than 5% of those who take the drug actually get headaches. 4) 5% of those who take the drug actually get headaches. b. What is the variable being examined for individuals in the population(s)? 1)more than 5% of those who take the drug actually get headaches. 2)the proportion of those who take the drug who get a headache. 3)whether or not a person who takes the drug gets a headache. 4)5% of those who take the drug actually get headaches. Is it categorical orquantitative? 1)Categorical 2)Quantitative c. Identify the parameter(s). 1)the mean of those who take the drug who get a headache. 2)all individuals who take the medication. 3)the proportion of those who take the drug who get a headache. 4)whether or not a person who takes the drug gets a headache. d. What is the claim? 1)Comparing two population means 2)comparing two population proportions 3)a population mean 4)a population proportion

The narration is about Chillingworth, the husband of Hester Prynne. "When he found the eyes of Hester Prynne fastened on his own, and saw that she appeared to recognize him, he slowly and calmly raised his finger, made a gesture with it in the air, and laid it on his lips." What can be inferred from the given lines? Hester Prynne and Chillingworth have legally separated. Chillingworth expresses his anger on Hester Prynne for her adultery. Chillingworth gestures to a man in the crowd to punish Hester for her adultery. Hester Identifies Chillingworth in the crowd and abides by his command.

Consider the ions Na and I. How many protons and electrons does each of these ions possess? protons in Na electrons in Na protons in I electrons in I

Bi undergoes four decay reactions: B, a, B. B. Step 1. 214Bi undergoes ß decay to give 214Po In the second step, Po-214 undergoes a decay. What is the product of this step? symbol = mass number = atomic number =

2LiBr + 12 -- 2Lil + Br2 Calculate the mass of bromine produced when 9.033 x 1023 particles of iodine (l2) react completely. Use the periodic table to get the weights of the elements. Express your answer to the correct number of significant figures. The mass of the Br2 is ____ grams.

A 2.01-g sample of potassium chlorate was decomposed according to the following equation: 2KClO₃ → 2KCl+3O₂ How many moles of oxygen are formed? 0.0109 mol 0.79 g 0.0246 mol 0.0164 mol None of these choices are correct.

Methane and chlorine react to form chloromethane, CH3Cl, and hydrogen chloride. When 29.8 g of methane and 40.3 g of chlorine gas undergo a reaction that has a 64.7% yield, how many grams of chloromethane form? A)60.7 g B)44.4 g C)28.7 g D)18.6 g E)93.9 g

A student performing this experiment forgot to add phenolphthalein solution to the vinegar solution before beginning the titration. After adding 27 mL of NaOH solution, he realized his error and added the indicator. The solution turned bright pink. Suggest a procedure the student could follow to salvage the titration.

To avoid allergic reactions to latex gloves, the safest response from hospitals would be to (A) provide alternative gloves for hospital staff, (B) allow hospital staff to work bare-handed. (C) require a 5-minute time limit for wearing latex gloves. (D) provide allergy medication for its staff.

The Pauli Exclusion Principle tells us that no two electrons in an atom can have the same four quantum numbers. For an electron in the 3p orbital shown above, enter a possible value for each quantum number. n = ▭ l = ▭ m₁= ▭ Give ONE example m₀ = ▭ Give ONE example Though a given electron only has one value for m₁, there are ▭ possible m₁ values for electrons in 3p orbitals.

The Real Estate Division might order an independent audit of the broker's records by a CPA if the broker: (a) is suspected of moral turpitude. (b) Shows evidence of gross mismanagement. (c) Doesn't have a branch manager. (d) Isn't paying the sales agents the commissions stipulated in the employment agreement.

A scuba diver's oxygen tank is filled in a room which is at 23.0 C. It is then submerged in a tank of cold water to test where they are leaking. If the original pressure inside the tank was 20.00 atm and the pressure in the water is 19.25 atm, what is the temperature of the water?

A chemistry student decides to develop a new experiment with CO₂ (g) under the following conditions: A new sample of CO₂ (g) initially has a pressure of 875 mmHg, a volume of 1540 mL, and at a temperature of 28.0°C. The student then transfers the CO₂ (g) into a new container in which the gas is now at standard temperature and pressure (STP). What is the volume of the new container?

A chemical compound of unknown composition was carefully analyzed and found to consist of 36.4% carbon, 6.1% hydrogen, and 57.4% fluorine. The molecular molar mass of the compound is known to be 66.1 g/mol. a. Determine the empirical formula of the compound. b. Determine the molecular formula of the compound.

Given 225 grams of iron (II) nitrate and 178 grams of sodium phosphate: a. Calculate the mass of the precipitate that can form during the reaction. b. Which reactant is the limiting reactant? c. Which reactant is the excess reactant? d. If the percent yield of the experiment was 67.2%, what is the actual yield of the experiment?

Baeyer's reagent is a violet solution used for detecting certain chemicals. To make it you dissolve 1.00 g of KMnO4 in 100.0 mL of water. What is the molarity of that solution?

You standardize your NaOH solution by titrating 0.1174g oxalic acid (molar mass 126.07g/mol) with 34.05mL of solution. The reaction for this step is H₂C2O4 + 2NaOH- -> 2H₂O + Na₂C2O4- 10.00mL of an unknown HCI solution requires 51.78mL of the NaOH solution to reach the endpoint. What is the concentration of the unknown HCI solution?

47.8 grams of sucrose reacts with oxygen gas according to the reaction equation shown below. C12H22O11 + O2 → CO₂ + H₂O After a scientist performs the chemical reaction they find the actual yield of water to be 10.8 grams. Calculate the percent yield of this chemical reaction.

A scientist calculates their percent yield to be 94.3 % after performing an experiment where the actual yield was 88.9 grams. Determine the theoretical yield the scientist calculated before beginning the experiment.

2.89 grams of iron (II) acetate reacts with 2.53 grams of lead (II) oxalate. Predict the products, write the complete reaction equation, balance, and calculate the mass of the aqueous product.

0.169 grams of iron (II) acetate reacts with 0.495 grams of lead (II) oxalate. Predict the products, write the complete reaction equation, balance, and calculate the mass of the aqueous product.

Ammonia reacts with 0.0632 moles of oxygen gas producing dinitrogen trioxide and water. Write the reaction equation, balance, and calculate the number of moles of dinitrogen trioxide produced if all 0.0632 moles of oxygen gas are consumed during the reaction.