Hydrogen Questions and Answers

MISSED THIS Watch KCV 73 IWE 7 2 Read Section 7 3 You can click on the Review link to access the section in your e Text In a popular classroom demonstration solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide Part A Enter a balanced chemical equation for this reaction Express your answer as a chemical equation including phases AZO f O 5 2 2

volves completely removing an electron from Read Section 2 5 You can click on the Review link to access the section in your e Text Part A How much energy is required to ionize a hydrogen atom containing an electron in the n 2 level Express your answer in joules to three significant figures VAE

What wavelength of light contains enough energy in a single photon to ionize a hydrogen atom Express your answer in nanometers to three significant figures 10 A O A nm

Margarines are solid forms of fat made from oils Which of the following processes could be used to give an oil as a spreadable consistency Add hydrogen to the saturated fatty acid chains Remove hydrogen from the saturated fatty acid chains Switch the bonds from trans to cis None of these options is correct Replace saturated fatty acids with unsaturated fatty acids Replace some of the unsaturated fatty acids with saturated fatty acids

Compared to ionic and covalent bonds the strength of intermolecular forces are substantially greater Oslightly greater slightly less O substantially less the same

Ultraviolet radiation and radiation of shorter wavelengths can damage biological molecules because they carry enough energy to break bonds within the molecules A carbon sulfur bond requires 272 kJ mol to break What is the longest wavelength of radiation with enough energy to break carbon sulfur bonds Express your answer using three significant figures View Available Hint s Hint 1 Convert the energy needed to break a carbon sulfur bond from kJ mol to J photon xa AEO Xb a x x x x 1X1 X 10n X

What does a pH of 3 00 mean about a solution options The solution is a strong acid The solution is a strong base The solution is mostly acidic The solution is mostly basic Impossible to answer with the given information Question 14 What answer below best describes nuclear fission options A nuclear reaction where two small atoms merge together to form a new atom and absorb a significant an heat A nuclear reaction where two small atoms merge together to form a new atom and release a significant ar heat A nuclear reaction where one large atom breaks apart and releases significant amount of heat A nuclear reaction where one large atom breaks apart and absorbs a significant amount of heat Question 16 Analyze the word problem and match the vocabulary terms to the chemicals in the word problem 5 00 grams of solid citric acid is dissolved in 500 00 ml of water to make aqueous citric acid options 500 00 ml of water 5 00 grams of solid citric acid aqueous citric acid 1 2 3 Solute Solvent Solution

Gaseous methane CH4 reacts with gaseous oxygen gas O to produce gaseous carbon dioxide CO and gaseous water H O If 6 49 g of carbon dioxide is produced from the reaction of 4 17 g of methane and 10 6 g of oxygen gas calculate the percent yield of carbon dioxide Round your answer to 3 significant figures m

Provide a structure that is consistent with the data molecular formula C6H10 1H NMR 2 0 ppm 1H septet 1 8 ppm 3H singlet 0 9 ppm 6H doublet A O A B C OD B H CC C CH CH3 C CH3CH2C CH D E

A What physical properties should you consider in comparing the strength of intermolecular forces in solids and in liquids How would you measure stregnth of these forces B Arrange the following in order of increasing boiling point Remember the stronger the intermolecular forces the higher the boiling point RbF CO2 CH3OH CH3Br methylamine CH2F2 Explain your reasoning Remember O N and F for H bonding

6 Why is water sometimes called the universal solvent Many substances dissolve in H O The adhesion level in H O is very high The hydrogen bonding of H O is very low The density of H O is 1 0 g cm

4 The biuret test is a test for the presence of two or more peptide bonds in a substance Why would you expect aspartame to yield a negative biuret test result

Exercise L Identifying acidic and basic solutions from pH values Indicate whether the following pH values are acidic basic or neutral at 25 C ABN tomatoes pH 4 20 ABN lemon juice pH 2 20 ABN saliva pH 7 00 ABN eggs pH 7 80 ABN lime CaO not citrus pH 12 40 A B N strawberries pH 3 00 ABN plasma pH 7 40 ABN soft drink pH 2 80 ABN maple syrup pH 6 80 beans pH 5 00 ABN

Exercise H Using the ion product of water for calculations Calculate H3O when the OH has the following values 1 0 x 10 9 M OH 1 0 x 10 2 M OH 1 0 x 107 M OH 1 2 x 10 6 M OH 3 5 x 10 8 M OH ba

Exercise M Relationship between concentrations pH and acidity Complete the following table for solutions at 25 C enllulos Fanidi H3O OH pH acidic basic neutral 8 32 1 2 3 4 5 5 0 10 8 1 0 x 10 12 2 40 neutral

A 1 50 L container holds gas at 3 19 atm What would the pressure be in kPa if the container expanded to four times the volume

Which of the following only contains single bonds OHCN OH CCHCH3 OCH3CHO OCH3NH OHNNH

Where does reduction occur in galvanic and electrolytic cells O at the anode in both galvanic and electrolytic cells O at the positive electrode in both galvanic and electrolytic cells O at the cathode in both galvanic and electrolytic cells O at the cathode in galvanic cells and at the anode in electrolytic cells O at the anode in galvanic cells and at the cathode in electrolytic cells

Zero point energy for a particle in the infinite potential well one dimensional box problem arises because Group of answer choices the energy at which the particle escapes the box is arbitrarily set at 0 with all of the bound state energies negative in value the 1 D box starts at the O point namely x 0 due to the Heisenberg Uncertainty Principle the particle cannot be at rest with a momentum of 0 and a kinetic energy of 0 since there is some certainty in the position it must be inside the box which means there must be some uncertainty in the momentum the lowest energy state has 0 energy Duh

4 Complete the following sentences using the words active or inactive Bubbling of hydrogen peroxide in the presence of catalase indicates that the enzyme is Lack of bubbling of hydrogen peroxide in the presence of catalase indicates that the enzyme is

What is the pH of a 2 1 M solution of HNO3 O 0 32 O 0 32 O 14 32 O 13 68 O none of these

2 What is the conjugate acid of the following acids 4pts i HPO4

5 Draw a diagram illustrating the difference between a micelle a lipid bilayer vesicle and a cell membrane

19 Which element is most likely to form a covalent bond hydrogen a lithium b oxygen c caesiumd magnesium 20 Which element is most likely to form an ionic bond with aluminum d calcium

Try to balance the following chemical reaction HC1O4 aq NO2 g HCl aq HNO3 aq

2 Calculate AH for the following reactions using bond enthalpies a 2CO g O2 g 2CO2 g 1 0 3 100 1 Pal k b C2H2 g H2 g C2 H4 g Co Calze ION

Of the following, which is a monosaccharide? glycogen sucrose arabinose lactose

The type of bond that is most important in maintaining secondary structure of a protein is: Hydrogen bonding between the side chain (eg. R) atoms. Salt bridges between the side chain (eg. R) atoms. Disulfide bridges. The unique chemical bonds between hydrogen and any other atom in the same molecule. Hydrogen bonding between atoms that comprise the backbone.

Of the following, which is an aromatic compound? ethyl alcohol methane chloroform toluene

Write the balanced chemical equation for the reaction of aluminum with hydrochloric acid, HCI (aq). Equation: a.) Calculate the volume of hydrogen produced at STP by the complete reaction of 17.0 g of aluminum with hydrochloric acid. b.) Calculate the mass of aluminum chloride obtained by the complete reaction of 25.0 ml of 2.65 M hydrochloric acid with a sample of aluminum.

What type of interaction could occur between the side chains of a serine and a threonine residue? Disulfide bond Ionic bond or salt bridge Hydrogen bond Hydrophobic I DON'T KNOW YET

0.967 mol sample of hydrogen gas at a temperature of 13.0 °C is found to occupy a volume of 25.3 liters. The pressure of this gas sample

Normally, the pH of the human body is fixed in a very narrow range between 7.35 and 7.45. A patient with an acidotic blood pH of 7.3 may be treated with an alkali such as sodium hydrogen carbonate. Why would this treatment raise the pH of the blood?

Determine the enthalpy for this reaction: 2NaOH(s) + CO₂ (g)→Na2CO3 (s) + H₂O(l)

Draw the Lewis structure for NO₂F in the window below and then answer the questions that follow. What is the electron-pair geometry for N in NO₂F? What is the the shape (molecular geometry) of NO₂F?

What kind of intermolecular forces act between a methanol (CH3OH) molecule and a hydrogen fluoride molecule?

Magnesium metal can be dissolved by hydrochloric acid in order to produce hydrogen gas according to the following reaction: 2 HCl(aq) + Mg(s) → MgCl₂ (aq) + H₂(g) A 39.9 gram block of magnesium metal is placed into a beaker containing 2.50 L of 0.60 M hydrochloric acid. Determine the theoretical yield (in grams) of hydrogen gas. [Hint: this is a limiting reactant problem.]

Be sure to answer all parts. Write a balanced equation showing how this nucleus decays to form an a particle: Es-252. (Give all nuclei in the form AZX.)

Arrange the following bonds by increasing bond polarity. CI-P Cl-Ge CI-S CI-CI Cl-Br

Calculate the energy of an electron in the n = 2 level of a hydrogen atom.

A chemist conducted a study of the decomposition of phosphine gas, PH3 (g), into phosphorous gas, P4(g), and hydrogen gas. This reaction is represented by the following balanced chemical equation: 4 PH3(g) → P4(g) + 6 H2(g) She determined the rate of reaction with respect to the consumption of phosphine gas to be -0.0024 mol/(L s). What are the rates of formation of phosphorous gas and hydrogen gas in this experiment? Place your answer for phosphorous gas in the first blank and your answer for hydrogen gas in the second blank.

The pressure of the atmosphere decreases with increasing altitude in the Choose all that apply. stratosphere thermosphere troposphere mesosphere The pressure never decreases with increasing altitude.

In which of these layers of the atmosphere does the temperature increase with increasing altitude? Choose all that apply. Stratosphere Thermosphere Troposphere Mesosphere

A 11.0 g sample of an aqueous solution of hydrochloric acid contains an unknown amount of the acid. If 11.3 mL of 2.08 M potassium hydroxide are required to neutralize the hydrochloric acid, what is the percent by mass of hydrochloric acid in the mixture?

The equation for the production of methane is C + 2H₂(g) → CH4(g). How many grams of hydrogen are needed to produce 44.8 liters of methane at 273 K and 760 mm Hg? a. 2.0 g b. 4.0 g c. 6.0 g d. 8.0 g e. 89.6

For the following reaction, 0.750 grams of hydrogen gas are allowed to react with 14.3 grams of ethylene (C₂H4). hydrogen (g) + ethylene (C₂H4) (g) -> ethane (C₂H6) (g) What is the maximum amount of ethane (C₂H6) that can be formed? What is the FORMULA for the limiting reagent? What amount of the excess reagent remains after the reaction is complete?

What is the conjugate acid in the following equation? OH¯ + HCN → H2O + CN¯ (A) CN¯ (B) H₂O (C) HCN (D) OH¯

Consider the following equation: __K + H₂O → KOH +__H₂ (l) a. If 193 g of water react with 85.8 g of potassium, which is the limiting reactant? (1) b. What mass of hydrogen gas can be produced? (1) c. What mass of the excess reactant remains after the reaction has gone to completion? (1) d. If 1.2 g of hydrogen gas is recovered, what is the percent yield? (1)

A sample of polystyrene, which has a specific heat capacity of 1.880 J.g¹.C-¹, is put into a calorimeter (see sketch at right) tha contains 100.0 g of water. The polystyrene sample starts off at 91.5 °C and the temperature of the water starts off at 25.0 °C. When the temperature of the water stops changing it's 37.8 °C. The pressure remains constant at 1 atm. Calculate the mass of the polystyrene sample. Be sure your answer is rounded to 3 significant digits.

Given the following information, what is the standard enthalpy change for the reaction? O2(g) + 2SO2(g) + → 2SO3(g) ΔHf SO2(g) = -296.83 kJ/mol ΔHf O2(g) = 0 kJ/mol ΔHf SO3(g) = -395.72 kJ/mol -197.78 kJ 197.78 kJ -98.89 kJ 98.89 kJ