Preparation and Properties of Compounds Questions and Answers

HONONOHO SM A 6 O A MC SO 0 balance for basic conditio

The illustration to the left represents a mixture of nitrogen blue and oxygen red molecules If the molecules in the above illustration react to form NO according to the equation N O 2 NO the limiting reagent is the number of NO molecules formed is the number of and molecules in excess is

Which of the following statements is FALSE An atoms is usually larger than its corresponding cation Metals tend to form anions Nonmetals tend to gain electrons An cation is usually smaller than its corresponding atom

How much mercury is in this sample RATIO MOLES MASS Hg2 1 Moles 2K1 2 0 005 g Now that we know the moles of Hgl2 we can use the ratio in the balanced chemical equation to determine the moles of Hg2 the mercury in the hair sample We need to complete this step because after we know the moles of Hg2 we can then convert it to find the grams of mercury in the sample Hglz 1 0 000002568 0 001167 g 2K 2 Based on the ratios in the chemical equation above if there are 0 000002568 moles Hgl2 there will be moles of Host

Predict the bond order in CO Express your answer as an integer or to one decimal place View Available Hint s bond order 5 VAEO t

Imagine you are in a laboratory You are exploring the following reaction A B C When the product C is created bubbles form When 10mL of A is added to 10mL of B the reaction takes twenty seconds Your teacher gives you three unknown substances X Y and Z one of which is a catalyst for the reaction Design an experiment to test substances X Y and Z to determine which one is a catalyst for the reaction

Indicate the hybridization about each interior atom in CH3NH2 whose skeletal structure is H3 CNH 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 interior C atom has interior N atom has electron geometry and electron geometry and Reset Help hybridization The hybridization

Draw the Lewis structure for N H2 whose skeletal structure is HNNH Draw the molecule by placing atoms on the grid and connecting them with bonds Include all lone pairs of electrons 8

Balance the following reactions 12 Cl2 H O HIO3 HCI

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

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 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

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

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

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

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

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

The structure H2 CH2 12CH CHCH3 represents an unsaturated fat an amino acid a saturated fat a fake fat None of these options is correct a carbohydrate Question 6 1 point Consider a new drug for the treatment of osteoporosis Select the most lik mechanism of action for this medication from the list below Causes osteoclast cells to increase Acts to stimulate osteoclast activity above normal levels ONeutralizes factors that normally inhibit osteoblast activity Stimulates the processes of bone resorption None of these options is correct Decreases the absorption of vitamin D from the gut

Which molecule or ion below has the largest bond angle OF 0 NH3 NF3 NF CF4

The compound copper II nitrate is a strong electrolyte Write the reaction when solid copper II nitrate is put into water

The central atom in a molecule has a bent molecular geometry Determine the hybridization of the orbitals in the atom sp O sp sp3

nate propanoate is used to sweeten soft drinks O is only found in plant foods is the substance in oat bran that reduces cholesterol is a suspected carcinogen None of these options is correct O inhibits the growth of moulds Question 59 1 point B vitamins are termed B for body building are only available as supplements by prescription are fat soluble must be injected to be effective None of these statements is correct are involved in energy production

Match each four electron group designation with the correct molecular shape Instructions AX4 AX3E AX E2 Tetrahedral

Dolomite is a substance sold in health food stores Select the correct statement Due to the toxic nature of dolomite it has been banned in the U S and Canada Dolomite can contain toxic heavy metals such as mercury Dolomite is a mixture of calcium and magnesium carbonate and is always purified to eliminate other elements This product is mainly magnesium sulfate and is soluble in water This substance is not a good source of calcium as it does not dissolve well in water None of these statements is correct

Write a balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate A Al C H302 3 aq NH4 3PO4 aq B AI CO3 2 aq NH3 2PO4 aq C AI C H30 2 aq NH3 2PO4 aq OD AI C H302 2 aq NH4 2PO4 aq AIPO4 s 2 NH3CO3 aq AIPO4 s 3 NH4C H O aq AIPO4 s 2 NH3C H O aq AIPO4 s 2 NH4C H3O aq

Calculate the change in enthalpy for the following equation 2 NH3 g 4H O 1 2 NO2 g 7 H2 g Given W N2 g 3 H2 g 2 NH3 g AH 207 0 kJ N2 g 2 O2 g 2 NO2 g H2 g O2 g H O 1 256 3 kJ 208 4 kJ 40 7 kJ AH 148 5 kJ AH 78 7 kJ

Complete the balanced equation for the reaction that occurs when the following strong acids and bases react with each other Use the lowest possible coefficients Be sure to specify states such as aq or s If a boxi not needed leave it blank a b C HNO3 aq H SO4 aq HC1O4 aq NaOH aq NaOH aq CsOH aq

Given that hydrogen carbonate ion HCO3 aq has a K of 4 8x10 11 which of the D following is the K for the carbonate ion CO3 aq 1 0x10 14 1 0 10 7 4 8x10 11 2 1 10 4

Which statement below regarding ionic compounds is FALSE The net charge of an ionic compound is zero Oppositely charged ions collect together in part because isolated ions are not stable The energy associated with an ionic bond is a form of electrostatic potential energy lons are held together by shared pairs of electrons Oppositely charged ions arrange themselves to minimize repulsions and maximize attractions

What type of bond occurs between an atom of boron and iodine given the electronegativity of B 2 0 and 1 2 5 polar covalent bond nonpolar covalent bond ionic bond metallic bond

The following is a list of several levels of organization that make up the human body 1 tissue 2 cell 3 organ 4 molecule 5 organism 6 organ system The correct order from the smallest to the largest is O 4 2 1 3 6 5 O 4 2 1 6 3 5 O 4 2 3 1 6 5 O 2 4 1 3 6 5 O 6 4 5 2 3 1

Listen Why does an electron found in a 3s orbital have a lower energy than an electron found in a 3p orbital in multielectron systems There are more nodes found in the 3s orbital The shape of the orbital ultimately determines the energy of the electrons Electrons in the 3s orbital can penetrate the 1s orbital and be closer to the nucleus Electrons in the 3s orbital are shielded by electrons in the 3p The larger number of electrons found in the 3p orbital leads to greater repulsion

Which statement properly describes the formal charges on e atoms in Se03 1 on selenium atom 1 on one oxygen atom 2 on selenium atom 1 on two oxygen atoms 0 on all oxygen atoms

options A nuclear reaction where two small atoms merge together to form a new atom and absorb a significant amo heat A nuclear reaction where two small atoms merge together to form a new atom and release a significant amo 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 15 The reaction rate of a reaction can be sped up by which of the following More than one answer is required wrong answers will get a penalty options Increase the pressure inside the container where the reaction is happening Decrease the temperature of the reaction Increase the temperature of the reaction Use a catalyst to reduce the needed activation energy Increase the concentration of reactants Decrease the concentration of reactants Decrease the pressure of the container where the reaction is happening 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

Listen Indicate whether the following formulas are empirical or molecular 1 v 2 N 04 C8H10N402 1 Empirical 2 Molecular

SO2 reacts with H S as follows 2H2S SO 35 2H O When 7 50 g of H S reacts with 12 75 g of SO2 which statement is true OA 0 221 moles of SO2 is consumed B 0 442 moles of SO2 is consumed C 0 266 moles of SO2 is consumed D 0 111 moles of SO2 is consumed

For violet light with a frequency of 7 50 x 1014 s 1 What is the energy of a single photon in joules h 6 626 x 10 34 Js Hint E hv 1 65 x 10 12 J 4 97 10 19 J O 3 97 x 10 14 J O 7 92 x 10 13 J O 6 97 x 10 15 J

Which electron transition produces light of the lowest frequency in the hydrogen atom 4p 1s O 6p 6p 1s 5p 1s 3p 3p 1s

The name of the molecule shown is OH O O O O O 4 isopropylcyclohexatrienol hydroxyisopropylbenzene hydroxyphenylisopropane 4 isopropylphenol I DON T KNOW YET

Select the redox reaction from the following O NaCl aq Na aq Cl aq Na SO4 aq BaCl aq BaSO4 s 2 NaCl aq CaCO3 s CaO s CO2 g HBr aq KOH aq KBr aq H O l OCH4 g O g CO g 2 H O g

Complete the sentence to identify which molecule or ion C C or C2 has the highest bond order highest bond energy and shortest bond length Match the items in the left column to the appropriate blanks in the sentences on the right View Available Hint s 0 1 1 5 2 2 5 3 directly inversely According to MO theory C has the bond order of and C has the bond order of Thus the molecule or ion with the highest bond order is Since bond order is energy is Since bond order is bond length is Reset Help C has the bond order of related to bond energy the molecule or ion with the largest bond related to the bond length the molecule or ion with the shortest

The sodium ion is a dietary mineral essential to good nutrition Sodium is necessary for the binding of adenosine triphosphate an organic compound that provides energy to drive many processes in living cells with potassium The main dietary source of sodium is table salt sodium chloride The recommended daily allowance RDA for sodium is 1 50 106 g day How much sodium chloride 39 34 Na should be consumed to meet the RDA Express your answer in micrograms to three significant figures m NaCl VAEO ug

What is the shape of a molecule with a AX2 structural formula Tetrahedral Trigonal planar Linear

Let s start by predicting the way that a single drop of water and a single drop of alcohol will look when you put them on a surface like a penny or wax paper Do the following 1 In your notes draw a picture of how you think a single drop of water on a penny will look compared with how a single drop of alcohol will look 2 Below your drawing explain why you think the two will be different 3 Once you ve made your drawing and prediction go ahead and do the experiment if you have materials Then click show the answer 4 If you don t have the materials click on show the answer to see the results and to verify your prediction

Injected with blood from human beriberi patients they develop niacin deficiency they are unaffected they develop rickets none of these responses is correct they develop beriberi they die Question 19 1 point Which of the following statements about minerals is correct It has only recently last 5 years been determined that iron and iodide are essential for good health Zinc as elemental Zn is necessary for growth and is extensively present in bread Selenium as selenite functions as a useful antioxidant component Boron a borate salt is important mainly in having nice hair None of these statements is correct The exact dietary requirements for all minerals are now well worked out

Which one of the following statements abou The calcium content of whole milk and skim milk is virtually identical O Calcium is found only in foods of animal origin The only way to meet the body s daily requirement of about 1 gram of calcium to take calcium supplements None of these statements is correct Calcium in the diet is either incorporated into bone or excreted An adequate intake of Vitamin A is required for calcium absorption Question 71 1 point Which one of the following would not be present in an apple Vitamin B12 All of the options are present in an apple Rubbing alcohol Fiber Acetone Formaldehyde