General Questions and Answers

Consider the reaction 2N O g 4NO g O g AH 4910 kJ How much heat in Joules would be required to decompose 43 8 g N O5 g Edit View Insert Format Tools

2 points A box of Rice Krispies contains 12 servings of cereal Each serving contains 40 mg of potassium How many moles of potassium would there be in 235 boxes of cereal 0 24 2 88 82 34 6

The temperature of an object measured in Kelvins may be greater of less than the temperature measured in C will always be greater than the temperature measured in C will always be less than the temperature measured in C Previous

65 2 points A homing pigeon flying at 87 mph Does this have more kinetic or potential energy potential kinetic Previous

67 2 points Liquid mixtures are considered to be homogeneous if they are uniformly mixed translucent trancendental transparent O Previous

61 2 points In deep space there is very little energy What would you guess is the approximate temperature in deep space 3 K 3 F 3 C

JZ 53 54 55 63 2 points In the reaction below what coefficient should be placed in front of O2 in the balanced equation C H8 0 4 8 6 5 Previous

51 52 53 54 55 56 57 51 2 points The one element that is never the reducing agent in a reaction not including noble gases of course is francium lithium oxygen fluorine Previous

Tap on a table cell to enter or edit its value Tap on the CF Conversion Factor button for a Hint The first two Hints are free Thereafter 4 will be deducted from your Health Percent for each hint Formula Molar Mass g mol A NaNO3 B NaNO C NaNO D Na SO4 E Na SO4 of Particles 3 01 x 1023 1 68 x 1024 x10 x10 x10 CF t 4 of Moles 2 50 5 27 88 18 B CF Mass grams 28 4

29 2 points Pure water would be O neutral O acidic O basic Previous

45 2 points How many grams of H O are required to produce 250 0 g of Ca OH 2 in the reaction below Ca3P2 6H O 3 Ca OH 2 2 PH3 199 g 121 g 397 g 60 g

3 9 D 48 2 points In a metric English conversation the metric unit O is always the denominator is always the numerator can be either the numerator or denominator Previous

40 2 points What would the bond angle be in the hypothetical molecule shown below AA A X A A I A O 120 O 180 O 109 5 90

2 points Would the molecule below be more soluble in a polar or nonpolar solvent note that the diagram does not represent the actual bond angle A A X A A nonpolar Opolar

According to the scientific method a hypothesis is O a a carefully controlled observation O b none of these O c a model of the way nature is O d a proposed explanation of a phenomenon O e a statement that summarizes past observations and predicts future ones

1 3 42 2 points How many atoms would there be in 33 0 g of C H6 4 44 x 1023 2 83 x 1025 O3 53 x 1024 O5 29 x 1024 Previous

28 2 points A train traveling from San Francisco to Chicago as it passes through Davis at a speed of 60 mph Does this have more kinetic or potential energy potential kinetic

38 2 points What is the name of F205 O Bifluorine V oxide O Difluorine pentoxide O Fluorine V oxide Difluorine peroxide

Which of the following substances if any exhibits polar covalent bonding Be sure to choose all correct answers a NF3 b PbS O c F2 Od None exhibit polar covalent bonding

The term formula unit is only used to describe covalent substances True False Previous

30 2 points A silver plated spoon is a heterogeneous mixture O a compound O an element O a homogeneous mixture

Determine how many significant figures are in the measured quantity 0 001050 and enter that number of sig figs in the space provided Please enter only a number

If a compound with a molar mass of 120 g mol has the empirical formula C H2O1 what is the molecular formula of the compound O a C4H804 O b None of these O c C H 01 O d C H4O2 O e C3H603

How many unpaired electrons are in an atom of carbon C in its ground state Enter only a number please

Select all of the following that is are a strong base in water Be sure to choose all correct answers a Be OH 2 b None are a strong base O C NH3 d KOH e CH3OH

What is the molar mass of C4H8O Enter your answer in g mol to the nearest whole number do not include units d

A single p orbital has a maximum capacity of Enter your answer as a number only electro

Identify the type of reaction shown Na3PO4 3 KOH 3 NaOH K3PO4 O a Ob O C Od O e Synthesis or Combination Decomposition Single Replacement Double Replacement Combustion

The name of SnO2 is O a none of these O b tin hydroxide OC tin II oxide O d tin oxide O e tin IV oxide Of tin dioxide

Classify the reaction AB CD AD CB O a Double displacement reaction Ob Combination synthesis reaction O c Single displacement reaction O d Decomposition reaction Oe None of these

21 2 points The maximum number of bonds a helium atom can form is O 1 1204

What is the correct name for N205

5 List the three most prevalent artificial sweeteners on the market today and provide an interesting health effect that you learned from viewing one of the web sites provided in this laboratory experiment

4 What type of chemical reaction takes place when HCl is added to a sample of a diet beverage sweetened with aspartame Draw the products

22 2 points What substance was oxidized in the following reaction Fe O3 2 Al 2 Fe Al O3 O O O O O Al 0 O A1 O Fe Fe3

1 1 5 2 points What kind of reaction is the one shown below Ga OH 3 HC H3O2 Oprecipitation Ono reaction acid base combination Previous

Based on the boys actions which statement BEST compares their work and power 0 Will and Bill are in the weightlifting room before soccer practice Will lifts the 100 pound barbell over his head 10 times in one minute Bill lifts the 100 pound barbell over his head the same distance as Will but he raises the barbell 10 times in 10 seconds A B D They do the same amount of work and have the same power A They do the same amount of work but Bill has more power B Will does more work than Bill Bill has more power than Will Bill does more work than Will and he has more power than Will Which two students generated the same amount of power Students performed a stair climbing experiment to investigate the power output of the human body Each student climbed the stairs in a sports stadium to different heights while another student used a stopwatch to time the climb The body mass time and vertical height reached by four students is given in the table Estimate g as 10 m s Data Table 3 Power Student Mass kg Time s Vertical Height m Johanna 56 11 2 8 0 Gwyn 62 16 0 8 0 Rydell 74 22 2 12 0 Toshiko 58 14 5 12 0 Toshiko and Gwynn Save Gwynn and Johanna Submi

19 2 points Asaline solution contains 0 103 mole L of NaCl What is the w v concentration of the solutic 0 60 8 0 9 0 0 80

Identify the type of reaction shown 2 Mgl2 Mn SO3 2 2 Mg SO3 Mnl4 O a Ob Oc d Oe Synthesis or Combination Decomposition Single Replacement Double Replacement Combustion

20 2 points The name of the binary acid consisting of hydrogen and chlorine is hydrochloric acid chloric acid hydrogen chloride hydrogen chloridic acid Previous

Identify the type of reaction shown SeCl6 O SeO 3 Cl O a O b O c d e Synthesis or Combination Decomposition Single Replacement Double Replacement Combustion

10 points The compound CH4 can have more than one isomer True False

In the example below Each of the falling electrons emits a different type of energy Which of the three would be emitted when an electron falls from level 6 to level 1 a orange light b ultraviolet c infrared i Level 6 to level 1 ii Level 6 to level 2 iii Level 2 to level 1 b ultraviolet a orange light c infrared

8 2 points Based on the Law of Mass Conservation Lavoisier hypothesized that matter can lose or gain mass as hot dry cold or moist qualities change an element is a combination of substances water is a fundamental element an element is made of a fundamental substance that cannot be broken down into anything els

1 2 points A medium order of McDonalds French fries contains 677 mg of salt If a McDonalds restaurant sells 3615 orders of fries each week how many pounds of salt will they nee In the problem above what should the starting point of your unit plan be 3615 orders 1 00 lb 1000 mg g 677 mg

6 2 points In the reaction below what are the coefficients of the products in the balanced equation Ga NO 3 Ca O2 and 3 1 and 3 O2 and 2 1 and 2

2 2 points Which element could be represented by the diagram below O OO He O Be Ti X

How many moles of sodium are in a sample containing 4 6x1024 sodium atoms Input your answer in moles to two significant figures do not include units

Balance the following chemical equation being sure to enter coefficients of 1 where appropriate 102 C5H12 CO2

How many valence electrons does a phosphorus atom have Enter only a number