General Questions and Answers

Consider the reaction 3X 2Y 5C 4D With excess Y how many moles of X are needed to produce 19 00 moles of D Question 2 1 pts CuSO4 aq Zn s Cu s ZnSO aq The single replacement reaction above produces 186 0 g of copper and an unknown concentration of zinc sulfate With excess Cus what mass of Zn was used Molar mass of Cu 62 55 g mol

Examine the nutrition labels on two brands of margarine and two brands of shortening and list the fats and oils used in the various brands

an arctic weather balloon is filled with 27 6 L of helium gas inside a prep shed The temperature inside the shed is 6 C The balloon is then taken outside where the temperature is 34 C Calculate the new volume of the balloon You may assume the pressure on the balloon stays constant at exactly 1 atm Round your answer to 3 significant digits L x10

Predict and Balance the following reaction Na H O Na H O NaOH 2Na 2H O 2NaOH H 2Na H O Na O H No Reaction Occurs ng ang Bild The TELE PIETRE ASSE une

For each chemical reaction listed in the table below decide whether the highlighted atom is being oxidized or reduc reaction Na CO3 s H3PO4 aq Na HPO4 aq CO g H O l H S aq 2 NaOH aq Na S aq 2 H O 1 CuSO4 aq Zn s ZnSO4 aq Cu s 2 CI aq 2 H O 1 2 OH aq H g Cl g highlighted atom is being oxidized reduced neither oxidized nor reduced O O

An unknown gas X effuses 0 858 times as fast as C3H6 What is the molecular mass of gas X g mol 1

How much heat is needed to melt 100 0 grams of ice that is already at 0 C O 226 000 J O 226 000 J O 33 400J 33 400J

Which of the following elements has the largest atomic radius Calcium Iron Cobalt Chromium

many ozone molecules are in one liter of air Question 4 In a stage one smog alert the concentration of ozone exceeds one ppm At one ppm ozone how many ozone molecules are in one liter of air 01 3 33 pts O 1 03 x 10 9 O 2 46 x 10 10 04 08 x 108 in other words there is less than one molecule in a single liter

2 Evaluate the real hydrogenoid wave function for 2S for He Suppose r is 20 greater than a

Study this chemical reaction 3 AgNO3 aq Al s 3 Ag s Al NO3 aq Then write balanced half reactions describing the oxidation and reduction that happen in this reacti oxidation reduction 0 0 D e

In a perfect world reactions can never go above 100 yield However in reality you will sometimes get above 100 yield Why You can never have above 100 yield under any circumstance Impurities Only Excess water and Impurities Excess Water Only

In the reaction 2H O2 2H O which reactant if any will be limiting if 0 592 g of H and 4 42 g of O are allowed to react to completion OH will be the limiting reactant O2 will be the limiting reactant neither will be limiting the reactants are stoichiometrically balanced to 3 significant figures there isn t enough information to know which reactant will be limiting

The names and chemical formulae of some chemical compounds are written in the first two columns of the table below Each compound is soluble in water Imagine that a few tenths of a mole of each compound is dissolved in a liter of water Then write down in the third column of the table the chemical formula of the major chemical species that will be present in this solution For example you know water itself will be present so you can begin each list with the chemical formula for water H O C Note major chemical species are those present in concentrations greater than 10 6 compound glycerol fructose copper II chloride formula C3H803 C6H12O6 CuCl major species present when dissolved in water 0 0 X mol L 0 0

2 Balance the following chemical equations Write the sequences to the right 2 CaCO3 2 CaO 2 CO 1 2 Al 3 H SO4 2 3 4 5 2 C6H6 2 Ba0 2 AgNO3 15 0 2 Ba0 1 Al SO4 3 3H 12 CO 6 H 0 C 12 H 12 O 30 1 0 1 CuCl 2 AgCl 1 Cu NO3 2

Ticket Use the reaction below to answer the questions that follow Mg NO3 2 NaCl MgCl NaNO3 Molar Masses NaCl 58 44 g mol MgCl 95 2 g mol 1 Balance the equation above 2 A sample of sodium chloride with a mass of 25 0 g is reacted with 75 0 mL of 0 20 M magnesium nitrate What mass of magnesium chloride will be produced 3 Challenge What mass of excess reactant is leftover

Which of the following elements does not react with other elements in nature Na ON Ne Ni

Question 38 If the pressure of 1 5 moles of a gas is 2 atm and the temperature is 27 C what is the volume of the gas 5 0 L 49 25 L 37 0 L 1 5 pts 18 5 L

Choose the coefficients the would balance the following chemical reaction a K3PO4 b Ca NO3 2 c Ca3 PO4 2 d KNO3 d C

Hydrochloric Acid would best be described as a Arrhenius Br nsted Lowrey and Lewis Base O Arrhenius and Lewis Acid PARTES CH

vill Mole Ratio Worksheet 1 Given this equation N2 3 H2 2 NH3 write the following molar ratios a N2 H2 b N2 NH3 c H2 NH3 Given the following equation 8 H2 S8 8 H2S write the following mola

In experiment P7 of the phys chem practicals the second order reaction between iodomethane and a hydroxide ion is studied The following measurements are performed to determine the rate constant k 8 3905 g of KOH and 9 7231 g of iodomethane are measured with an analytical balance a time of up to 3600 s is measured with a stopwatch a 100 ml volumetric flask with an accuracy of 0 2 ml and a 50 ml volumetric flask with an accuracy of 0 12 ml are used to prepare the reactants mixture and a burette with divisions of 0 1 ml and aliquots of up to 1 ml is used to determine the hydroxide ion concentration Calculate the minimum error due to stopwatch Select the correct answer 90 0014 0 00014 0 00037 0 0007

What term describes a systematic way of problem solving that is used in science as well as other types of problems Scientific Method Conclusion Hypothesis Problem

If a reaction is product favored what can be said about the Equilibrium Constant of the reaction O Equal to 1 O Less than 1 Negative Greater than 1

If you dilute a solution what is the only thing about the solution that does NOT change O Concentration O Liters of Solution Moles of Solute Kilograms of Solvent

Heating up a reaction does which of the following O Increases the strength of the collisions only No effect is found on the reaction by increasing the temperature O Increases the number of collisions only Increases the number of collisions as well as the strength of the collision

Once balanced what is the coefficient of HCI in the following reaction Mg HCI MgCl2 H 1 3 2 0

How many moles of NH3 are formed if 32 5 L of hydrogen reacts with nitrogen Assume that the reactants and product are all gasses at STP BIU EJE S S TU YOU MUST SHOW YOUR WORK N 3H 2NH3

In the image below the purple particles are protons and the white particles are neutrons Which of the following equations matches the balanced reaction sho the diagram A B C D OO a O b 3 2 H 1 H H H H He He H A F B 3 H He Li H 3 3

19 3 How many grams of NaCl are needed to make 5 00 L of a 0 875 M solution

How many s and p bonds are there in CH CHCHCH2 s bonds p bonds What is the hybridization around the carbon atoms

Answer 8 SO3 Consider the following reaction S8 12 0 a If you have 13 2 moles of oxygen O how many moles of sulfur S is also needed b If 891 76 mole of SO3 is produced how many mols of O will be no

Question 25 If a compound is 5 9 H and 94 1 O what is the molecular formula if the molar mass is 34 g mol H O H3O H O2 HO

3 True or False The two main hormones in the endocrine system are the stero hormone and non steroid hormone A True B False

How many moles of Carbon are in 36 0 g of Carbon O 1 5 moles O432 moles 3 0 moles O 36 moles

Question 7 Points 2 How does the Due Process Clause in the 14th Amendment affect the Bill of Rights OIt prohibits the states from making any laws that deny the basic rights O It allows the states to make laws contrary to the Bill of Rights O It mandates that due process is given to anyone charged with a federal crime

If a chemical reaction produces 20 0 grams of product but by stoichiometry it is supposed to have 25 0 grams of product what is the percent yield of the reaction 125 20 75 80

What is the formula for the compound dinitrogen pentoxide ON502 ON O5 N O3

What is the only state of matter that can be condensed Plasma Liquid Gas Solid

g mol 3 Find the amount of moles in 56 9 grams of Mg OH 2 Mg OH 24 31 161

What is the name of the compound Fe3 PO4 2 Iron II Phosphate Iron III Phosphide Iron II Phosphide Iron III Phosphate G

9 1 The following graph represents the heating curve of a hypothetical substance 125 100 975 50 25 0 Temperature C 25 g 0 2 4 Heat added kcal mol What it the melting point What is the boiling point 10 Approximately what is the heat of fusion for the substance in kcal mol Approximately what is the heat of vaporization for the substance in kcal mol Approximately what is the specific heat capacity of the liquid shown in this heating curv

At the triple point on a phase diagram what state s of matter exist Liquid ONLY Solid and Liquid None of the 3 states of matter Solid Liquid or Gas exist at this point Solid Liquid and Gas

At the equivalence point of a titration of the H concentration is equal to 1x 107 M OH 07 1x 107 M

Answer each of the following questions using the equation provided BE SURE TO BALANCE BEFORE SOLVING SHOW ALL WORK 1 N H NH3 a If 56 0 grams of nitrogen are used up by the reaction how many grams of ammonia NH3 will be produced noitoon srit 107 A among 0 SP soubong of fort moibee to zmong to nadmun abixo muiboz b How many grams of hydrogen must react if the reaction must produce 63 5 grams of ammonia NH3 em word buitewallot en ti naitupa boundled seonw noitaban art 107 2 among 002 to yd boobong se li atorgeody ons to among 2 Al ZnCl Zn AICI3 sqearly muinommo to 109 on s B DIHMO 10 a A mass of 45 0 grams of aluminum will react with how many grams of ZnCh b

The students want to know what would happen to the force exerted on Earth from the Sun if the distance between Earth and the Sun increased Complete these tasks Explain how the force would change By using G m or d identify the independent variable in the equation that causes this change

Solubility g per 100g water 90 80 70 60 50 40 30 20 10 0 0 O grams O 20 grams 10 grams Solubility vs Temperature for a variety of salts O 40 grams 20 40 60 Temperature Using the above graph what would the solubility be of Ba NO3 2 at 60 C in 200 grams of water 80 Na2SO4 NaCl Ba NO3 2 Ce2 SO4 3 9H20 Na2HASO4 100

Family 17 or 7B 7 valence electrons F Cl Br I At very reactive Nonmetals They are very reactive because have 7 valence electrons this means they are ALMOST full and can combine with many elements Halogen elements combine with metals to form compounds called salts Family 3 12 1B 8B Metals 1 2 valence electrons Less reactive than alkaline earth metals because they don t give away their electrons as easily Bottom 2 rows are the Lanthanide F this is a Bohr model of F

Which element has an electron configuration of 1s22s 2p63s 3p Phosphorus Silicon Arsenic O Nitrogen

In the chemical reaction Cu 2AgNO3 2Ag Cu NO3 2 What is the limiting reactant if you start with 1 8 moles of copper and 2 0 moles of silver nitrate copper II nitrate silver copper silver nitrate D