Qualitative analysis Questions and Answers

If a scientist reacts 138 53g of magnesium metal with 35 62g of oxygen gas and 13 96g of magnesium oxide is recovered in the lab what is the percent yield for the reaction You will be asked to upload your work for this question

12 What is the configuration of double bonds cis or trans in most naturally occurring lipids

In an acidic solution H OH In a basic solution OH H O In a neutral solution H OH O None of the above statements a c are correct O All of the above statements a c are correct Question 30 A 102 7 g sample of nitric acid solution that is 70 0 HNO3 by mass contains O 71 9 mol HNO3 O 1 14 mol HNO3 O 1 63 mol HNO3 4 53 x 103 mol HNO3

O H SO4 SO O HNO3 NO O HC2H302 C H O O H PO HPO OHBr Br Question 26 True or false The conjugate acid of a weak base is a strong acid True

Which of these is held constant for coffee cup calorimetry O Internal energy of the sample O Pressure O Volume Temperature

a Assuming both fatty acids contain the same number of carbon atoms which would be more dense an unsaturated or saturated b Briefly explain how the presence of a double bond affects molecular packing and the

The air in the inner tube of the tire of a racing bike has a pressure of 109 9 psi Convert this pressure to atm O 0 1446 atm O 7 476 atm O 1616 atm O 1 085 atm O 109 9 atm

1 Hyperbaric oxygen chambers HBO are used to treat divers with decompression sickness As pressured increases inside the HBO more oxygen is forced into the bloodstream of the patient inside the chamber To work properly the pressure inside the chamber should be three times greater than atmospheric pressure 101 3 kPa What volume of oxygen held at atmospheric pressure will need to be pumped into a 190 L HBO chamber to make the pressure inside three times greater than atmospheric pressure

Burning 1 82 grams of lactose C12H22O11 in a bomb calorimeter with C 6 95kJ C increases the temperature from 31 6 C to 33 8 C How much heat is released by burning lactose in kJ mol

A mixture of xenon and nitrogen gases contains xenon at a partial pressure of 645 mm Hg and nitrogen at a partial pressure of 206 mm Hg What is the mole fraction of each gas in the mixture Xxe XN

Important values if needed for this question need to make an aqueous solution of 0 162 M calcium iodide for an experiment in lab using a 250 mL volumetric flask How much solid calcium iodide should you add grams

1 Why is distilled water used in this experiment rather than tap water

Given the following equilibrium equation heat N g 3 F2 g 2 NF3 How would decreasing the size of the reaction container change the equilibrium It would shift the equilibrium to the left and consume more F2 It would shift the equilibrium to the left and make more N It would shift the equilibrium to the right to make more products It would shift the equilibrium to the right and consume more NF3

N why they are adverbs below I accidentally broke the antique vase sitting on the table at the entrance of the house I am very clumsy and often break things ADVERR Tyne here

2 What are the 3 main types of receptors in the body 3 Explain how a stimulus travels to the brain 4 What is the difference between long term and short term memory

a Explain how you would prepare the following solutions Include in your answer the amount of the solute weight or volume and the amount volume of the solvent you would use 500ml of 85 ethanol 2 liters of 20 sodium chloride 1 agarose gel for DNA electrophoresis using agarose and Tris acetate EDTA buffer 300ml of fixative made with methanol and acetic acid 3 1 volume volume b Convert the following measurements ml 5 0 ml 25 0 g 0 5 mm kg mm 0 64 ml 33 0 mg 78 0 mm ml mg mm

How are senses alike and how are the different

The advice impact of the decline of play is that they lose their ability to socialize with others and acting hustle fashion with other people and lose their adventurous nature at 2 00in the video Playing allows them to learn how to work with others in the society And make their adventurous nature bloom Children learn through playing by playing with other children to learn how to behave with other people in a socially acceptable way It is important allow them to play because in a test experiment when the rats did not play they could not socialize other creatures when they put in the same cage they will attack the other rats and act violently at 2 15 in the video

My car has an internal volume of 1600 liters At a temperature of 20 0 C and a pressure of 760 mm Hg how many moles of gas are in my car

Exercise E Combined Gas Law Using the combined gas law Pressure P x Volume V Constant Temperature T calculate the parameter that is missing in each row of the following table Enter the appropriate form of the combined gas law in the first column as shown in the table Be sure to enter the appropriate units for each result and use the appropriate units when calculating the result Equation hel T1 P2 x V2 x T1 T2 300 K P1 x V1 400 K 500 K 400 K Hist P1 2 0 atm 1 50 atm 3 00 atm 760 mm Hg V1 2 0 liters 2 50 liters 6 00 liters 1 0 liter mive T2 1200 K 700 K 400 C 13 0 06 len P2 4 0 atm 3 50 atm 1 5 atm V2 4 0 liters 250 mL 2 00 liters

Calculate the volume of liquid in the NMR tube sketched below Give your answer in microliters and round to the nearest 1 L A 2 6 mm 1 73 cm L X 5

7 Describe the physical process by which soap solubilizes dirt Hint Use the solubility principles to complete a diagram e g micelle showing many soap molecules as bridges between water and oil Label and explain the diagram further

Consider the molecule with the following skeletal structure Experiment 10 Molecular Models and Covalent Bonding c OA H N H 1 Indicate the hybridization employed by each central atom a C b N c OA 2 Indicate the electron pair geometry about each central atom a C b N b pi bond s C 0H d OB d OB 3 Indicate the predicated bond angles around each central atom having more than one bond a C b N c OB Lab Re 4 Describe all the sigma o and pi n bonds in this molecule in the form of a hybridization and bonding scheme For example a hypothetical O H bond O 2sp2 H 1s is a sigma bond a sigma bond s

Nitrogen and hydrogen gases are combined at high temperatures and pressures to produce ammonia NH3 If 104 7 g of N are reacted with excess H how many moles of NH3 will be formed Hint Write out and balance the equation O2 49 mol none of these options 5 60 mol 7 47 mol 3 74 mol

Calculate ΔH for the following reactions using bond enthalpies a. 2CO(g) + O2(g) →→2CO2(g) b. C₂H2(g) + H2(g) → C₂H4(g) c. 4NH3(g) + 5O2(g) →→ 4NO(g) + 6H₂O(g) d. Br2(g) + CH4(g) → CH3Br(g) + HBr(g)

A metal cylinder with a fixed volume was filled with gas to 4.00 atm pressure at room temperature, 30.0 C. The cylinder was then taken outside on a cold winter day where the temperature was -30.0 C. What is the pressure inside the cylinder?

What would you need to do to make a 13% solution of sodium chloride (NaCl)? Add 26 g of sodium chloride to a beaker and add water to make a final volume of 200 mL. Add 13 g of sodium chloride to 100 mL of water. Add 13 g of sodium chloride to a beaker and add water to make a final volume of 100 mL. Add 26 g of sodium chloride to 200 mL of water.

Benzoic acid C6H5COOH has a heat of combustion of -3227kJ/mol. A 1.221g- sample burns in a calorimeter that has a heat capacity of 1365J/°C, and which contains 1.200kg of water. What temperature change is observed in the calorimeter?

When burning ethanol in a closed system, which of the following is the best claim and reasoning? The ethanol reaction stops because a bromthymol blue solution that's present turns the same color as when ethanol vapor is blown into the solution Evaporated ethanol is produced because it burns. Water is produced because a bromthymol blue solution that's present turns the same color as when water vapor is blown into the solution. Carbon dioxide is produced because a bromthymol blue solution that's present tums the same color as when carbon dioxide is blown into the solution. " 1 2 3 4 5 6 8 9 10

a) [NiH4]²- b) N3 c) Mo(CO) 6 d) PC|3l2 e) SiO44- For each of the molecules selected: Draw the correct molecular geometry, including resonance structures if appropriate. Provide the point group and the main symmetry elements (besides E). Determine the polarity of the molecule and the direction of the dipole.

An unknown weight of the aluminum sample (Al) was placed in the hydrobromic acid solution. The reaction was as follows: 2 Al (s) + 6 HBr (aq) -> 2 AlBr3 (s) + 3 H2(g) What was the mass of the Al sample (in grams) if a 14.4 L of the gas product of this reaction was collected at the temperature of 520.0°C and under the pressure of 741 mmHg? Molar masses (in g/mole): Al = 26.98; HCI=80.91; AICI3 = 266.69;H₂=2.00 Guiding questions: The temperature in K was The pressure in atm was The number of moles of gas was The mass of the Al sample was

A "dimer" forms when two of the same molecules combine (dimerize). Draw a Lewis structure for each of the substances below and indicate which are free radicals. For a free radical the unpaired electron goes on the least electronegative element, which is usually the central atom. C103 C103 CIO2 NO₂

How many grams of phosphorus (P4) are needed to completely consume 38.8 L of chlorine gas according to the following reaction at 25 °C and 1 atm? phosphorus (P4) (s) + chlorine (g) phosphorus trichloride (l)

Why does Neiterkob's daughter most likely tell the myth "The Beginnings of the Maasai"? to entertain the reader with the fantastic setting of where the Maasai live to persuade the reader to adopt the Maasai's affection for the sky god to explain to the reader the origin of Maasai culture to impress the reader with the history of the Maasai

In which period of the periodic table do the elements have a "core-electron configuration" that is the same as argon. Fourth Third First Second

When p-block atoms become ions their ionic electron configurations will be identical to the Nobel Gas in the preceding period. True False

Write the 4 quantum numbers for iron's LAST valence electron for iron. n = l = ml= ms=

In the experiment performed for the determination of cholesterol, the function of the calibration curve obtained using 25-400mg/dL standard cholesterol solutions were determined as y= 0.0009x. If the amount of cholesterol in the serum sample is determined as 3.11 g/L, what is the absorbance value of the sample? 0.208 0.280 0.820 0.802

Which verb agrees with the subject? Grace _ very happy today. were is are

Complete the sentence with the correct form of the verb. Fifteen gallons of chocolate milk _ Herbert the elephant a happy pachyderm. make makes making

Choose the right verb to complete the sentence. Jessica or Emma _ expected to win the election. have is are

Which of these sentences is correct? The vase of flowers looks attractive. The vase of flowers look attractive. The vases of flowers looks attractive.

Brother-in-law is an _. example of a(n) compound noun abstract noun collective noun

Read the following taken from The Letters of Charles Dickens at and answer the question that follows. A young Scotch lady whom I don't know (but she is evidently very intelligent and accomplished) has sent me a translation of a German play, soliciting my aid and advice in the matter of its publication. Among a crowd of Germanisms, there are many things in it which are so very striking, that I am sure it will amuse you very much. At least I think it will; it has me. I am going to send it back to her-when I come to Elstree will be time enough; and meantime, if you bestow a couple of hours upon it, you will not think them thrown away. Identify the tone of writing. Desperate Sarcastic Pleading

Interpret energy level and reaction pathway in displacement between zinc and copper sulphate,methanol,sodium bicarbonate with vinegar.

The solubility of BaCO3(s) in water at a certain temperature is 4.0 x 10-5 mol/L. Calculate the value of Ksp for BaCO3(s) at this temperature. 4.0 × 10-5 8.0 × 10-5 1.6 × 10-9 6.3 x 10-3 none of these

Calculate the induced dipole moment of I₂ due to a Nation that is 5.0 Å away from the center of the 1₂ molecule. The polarizability of I₂ is 12.5 × 10-30 m³.

Calculate the quantity of energy required to change 7.49 mol of liquid water to steam at 100°C. The molar heat of vaporization of water is 40.6 kJ/mol. 5.42 kJ 40.6 kJ 304 kJ 74.9 kJ 48.1 kJ

You have 250.0 mL of 4.00 M sugar solution. You add 319.0 mL of water to this solution. Determine the concentration of the sugar solution after the water has been added. 4.00 M 201M 2.50 M 1.76 M 2.09 M

We have a container enclosing a mixture of N₂(g) and O₂(g). The total pressure is 3.77 atm. The temperature is 25.00 °C and the volume of the container is 17.0 L. If the mass of N₂ in the container is 34.2 g, what is the partial pressure of O₂ (in atm) within the container?