Inorganic Chemistry Questions

Question 3 Points 2 What are the two central ideas that build upon each other through the course of the text in the essay Society and Solitude by Ralph Waldo Emerson Criticism against solitude and impact on nature Expression of silence and acceptance of solitude Expression of solitude and the impact of society

Chlorophyll the green pigment found in plants absorbs visible radiation best in the red region 675 nm and in the blue violent region 440 nm What is the energy of the photons collected by plant at 675 nm When submitting answers in scientific notation please use E to represent x10 An example would be 4 1 x 10 2 this would be counted correct as 4 1E 2

A sample of an unknown sulfate compound has a mass of 0 100 g Addition of excess barium chloride solution to the sample forms a barium sulfate precipitate of mass 0 0676 g What is the mass of sulfate ion in the unknown sample

Classify each of the following changes as physical or chemical Drag the appropriate items to their respective bins The liquid propane in a gas grill burns in a flame Natural gas burns in a stove Physical change Reset Help A bicycle frame rusts on repeated exposure to air and water The liquid propane in a gas grill evaporates because the user left the valve open Chemical change

Part B Indicate the hybridization about each interior atom in N H whose skeletal structure is HNNH Match the items in the left column to the appropriate blanks in the sentences on the right sp sp sp trigonal planar tetrahedral The left interior N atom has hybridization The right interior Natom has hybridization electron geometry and Reset electron geometry and Help

Balance the following reactions 12 Cl2 H O HIO3 HCI

Indicate the hybridization about each interior atom in N H4 whose skeletal structure is H NNH Match the items in the left column to the appropriate blanks in the sentences on the right trigonal planar tetrahedral trigonal bipyramidal sp sp The left interior N atom has The right interior N atom has electron geometry and electron geometry and Reset hybridization hybridization

Drag the appropriate items to their respective bins the tendency of ethyl alcohol to burn the odor of hydrogen disulfide Physical the flammability of methane gas the shine of silver Reset Chemical Help

Choose the correct sketch of SCL4 using the bond conventions shown in the Representing Molecular Geometries on Paper section of Section 5 9 in the textbook 6 C G C Cl

How many moles of sodium hydroxide would have to be added to 125 mL of a 0 436 M acetic acid solution in order to prepare a buffer with a pH of 4 490 moles

Calculate the mass in grams of iodine that will react completely with 20 4 grams of aluminum to form aluminum iodide Hint You need to write and balance the chemical equation for this reaction 8 pts 2171 3I ZA113

Water can be separated into its elements according to the following equation by electrolysis If 20 0g of water is decomposed by this method how much oxygen gas is produced 2 H O g 2 H g O g 17 8 g 16 0 g 10 0 g 8 90 g 35 6 g

Balance the following redox reaction in a basic solution using the method of you choice Show your work The oxidation number method is recommended 4 marks VO43 Fe VO Fe

Physical change Chemical change

The substance 3 bromopyridine is a weak nitrogenous base like ammonia Complete the following equation that shows how 3 bromopyridine reacts when dissolved in water Br Br g OH

What is the correct formula with physical state for neon under standard conditions Ne g Ne s Ne 1 Nez g New W

What volume of a 0 236 M hydroiodic acid solution is required to neutralize 27 0 mL of a 0 150 M calcium hydroxide solution 1ml hydroindic acid

bei all Drag the appropriate labels to their respective targets Labels can be used once more than once or not at all o N sp H s o C sp H s o N p H s o C p H s o C sp N sp o C p N p Lone pair in N sp 11 H H H H Reset Help I

The concern about caramel is that it adds excess calories to cola beverages is that it raises blood glucose levels None of these responses is correct is that it is contaminated with the carcinogen 4 methylimidazole is that it is addictive and increases cola consumption O is that it is contaminated with the carcinogen acrylamide

MISSED THIS Watch IWE 4 15 Read Section 4 11 You can click on the Review link to access the section in your eText A 0 57 mg sample of nitrogen reacts with chlorine to form 4 897 mg of the chloride Part A What is the empirical formula of nitrogen chloride Express your answer as a chemical formula View Available Hint s AF 2

MISSED THIS Watch IWE 4 13 Read Section 4 10 You can Click on the Review link to access the section in your eText Determine the number of moles of hydrogen atoms in each of the following samples Part B number of moles of C4H10 and the number of moles of H atoms nH 1 6 mol CH4 Express your answer in moles to two significant figures moles of hydrogen atoms VA O 0 0910 mol H10 X mol 10 mo 1 mol C

SSED THIS Watch IWE 5 12 Read Section 5 9 You can ck on the Review link to access the section in your eText Electron groups 2 3 3 4 4 Molecular geometry Bonding Lone Molecular groups pairs geometry 0 2 3 2 4 3 0 1 0 1 Linear Trigonal planar Bent Tetrahedral Trigonal pyramidal Make a sketch of the following molecule C H6 skeletal structure H3 CCH3 Draw the molecule by placing atoms on the canvas and connecting them with bonds Include all hydrogen atoms and nonbonding ele View Available Hint s An 9

MISSED THIS Watch IWE 5 12 Read Section 5 9 You can lick on the Review link to access the section in your eText Molecular geometry Electron Bonding Lone Molecular groups groups pairs geometry 0 2 3 3 4 4 2 3 AN 2 4 3 0 1 0 1 Linear Trigonal planar Bent Tetrahedral Trigonal pyramidal Make a sketch of the following molecule C H4 skeletal structure H CCH Draw the molecule by placing atoms on the canvas and connecting them with bonds Include all hydrogen atoms and nonbonding electrons View Available Hint s O 8

Calculate the hydroxide ion concentration of a solution if its pH is 6 389 Select one O a 9 92 x 10 7 M O b 2 45 x 10 8 M O c 4 08 x 10 7 M O d 1 00 x 10 14 M

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

CH CH CH3 will react with gaseous oxygen O to produce gaseous carbon dioxide CO and gaseous water H O Suppose 0 58 g Gaseous butane of butane is mixed with 3 91 g of oxygen Calculate the maximum mass of water that could be produced by the chemical reaction Round your answer to 2 significant digits x10

Use molecular orbital theory to predict whether or not each of the following molecules or ions should exist in a relatively stable form Drag the appropriate items to their respective bins View Available Hint s Will exist H 2 He 2 Nez F Will not exist Reset Help

Which ion below is linear O NO O SCN O SO3 2 O NH4

For the molecular compound sulfur dioxide what would you multiply grams of SO by to get the units molecules of SO g SO x T 1 gram SO molecules SO2 Drag and drop your selection from the following list to complete the answer 64 07 grams SO2 6 02 1023 molecules SO 2 64 07 mol SO 64 07 molecule SO 1 molecule SO 6 02 x 1023 mol SO 1 mol SO 6 02 1023 grams SO

Draw the Lewis structure of SCO

Which would have the largest effect on a neighboring bond angle two single bonds one double bond and a single bond O two double bonds Otwo lone pairs of electrons one lone pair of electrons and a double bond

Which molecule below contains an atom that is sp hybridized OH3C O CH3 OH3C CH3 OHC CHO OH3C OH OHC CH E

O can cause an improvement in leukemia Onone of these responses is correct is highly unlikely since folic acid is found in almost all foods causes osteoporosis is a problem faced by vegans causes a craving for foliage Question 29 1 point Invertase is one of a family of molecules that breaks up lactose into glucose and galactose is a highly complex protein which is sold as a food in South America None of these options is correct converts sucrose into glucose and fructose causes saliva to form thus aiding digestion

Determine the molecular geometry about each interior carbon atom of this molecule View Available Hint s bent linear trigonal pyramidal tetrahedral O trigonal planar

reaction Pb s Cl2 g PbCl2 s Trial 1 2 3 Or k pb Cl Or k Pb Cl Or k Pb Or Pb Cl 2 Initial Pb mmol L 0 45 0 45 0 90 Initial CI mmol L 0 15 0 30 0 15 Rate of Formation of PbCl2 mmol L s 0 08 0 16 0 32

SSED THIS Watch IWE 4 15 Read Section 4 11 You can k on the Review link to access the section in your eText e elemental mass percent composition of salicylic acid 60 87 C 4 38 H and 34 75 O Part A Determine the empirical formula of salicylic acid Express your answer as a chemical formula xa A o Xb b b X A chemical reaction does not occur for this question If one of the subscripts is not a whole number multiply the all calculated subscripts by a small whole number to get whole num subscripts rather than rounding dit legt Try again

Indicate whether the following formulas are empirical or molecular 1 2 C8H10N4O2 C10H7O2 N O4 1 Empirical 2 Molecular

Use molecular orbital theory to predict the bond order of He2 2 5 0 1 1 5 O

the following is true with respect to zinc None of these statements is correct It is a necessary component in only 4 5 enzymes and hormones It is considered toxic in milligram doses but not microgram doses It is a necessary component of over 300 enzymes and hormones It is present in the body at about the 20 grams level The RDA is about 20 micrograms per day Question 21 1 point The process of an egg white becoming opaque on cooking is called None of these options is correct water boiling protein folding denaturation protein decomposition fat protein interactions

goiter pellagra beriberi scurvy None of these options is correct night blindness Question 17 1 point Which of the following food components are thought to play a significant role in the creation of cataracts monounsaturated fats sucrose saturated fats certain vitamins trans fats None of these options is correct

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 H SO4 aq CuSO4 aq H O l Formula weight of hydrated copper II sulfate 249 677 g mol Formula weight of copper II oxide 79 545 g mol

8 If there are 2 81 x 1024 oxygen atoms available how many grams of barium hydroxide could be made 2 81x 10240 atoms

Select the correct Lewis structure for NF3 a F N F F b F N F F Z c F N F F d F N F F

Give the electron geometry eg molecular geometry mg and hybridization for NH3 eg trigonal planar mg trigonal planar sp O eg trigonal pyramidal mg trigonal pyramidal sp O eg tetrahedral mg trigonal pyramidal sp trigonal pyramidal mg tetrahedral sp3 eg tetrahedral mg trigonal planar sp

Look at the chemical formulas for the minerals chalcopyrite and pyrite Which of the following explains why chalcopyrite is softer and shows signs of tarnishing Both are sulfides but chalcopyrite has copper which makes it softer and more likely to tarnish Both are sulfides but pyrite has copper which makes it softer and more likely to tarnish Both are sulfides but chalcopyrite has sodium which makes it softer and more likely to tarnish Both are sulfides but pyrite has sodium which makes it softer and more likely to tarnish

When added to water which of the following would conduct electricity to clearly illuminate a light bulb when electrodes are immersed sugar OV 8 drink none of these options is correct zinc metal most fatty acids galactose Question 25 1 point Which one of the following supplements has the greatest scientific support OB Vitamins to prevent heart disease Vitamin C to reduce the risk of heart disease Multivitamin supplements to reduce the risk of cancer Vitamin E to reduce the risk of heart disease Folic acid to reduce the risk of birth defects

is based only on calorie content of different foods recommends at least one glass of milk a day does not distinguish between whole grain and refined carbohydrates makes no recommendation about relative proportions of fruits and vegetables carbohydrates and proteins recommends meat as the main protein source none of these responses is correct Question 67 1 point From the list of food below select the one that the amylase enzyme is most important for in the digestive process Red meat Fish Flax Grass None of these options is correct

List the following compounds in decreasing electronegativity difference Cl HCI HCI KCI

What is the formal charge of the nitrogen atom in hydrogen cyanide HCN Paragraph B I U A 8

For the molecule CH3 CH2 CH CH CH3 the local molecular geometry around third carbon atom from the end and its hybridization are trigonal plan and sp O trigonal planar and sp3 linear and sp O O tetrahedral and sp trigonal bipyramidal and sp3