General Questions and Answers

2 A student is working in a lab and mixes 25 0 g of Calcium Nitrate with excess Sodium Phosphate How many grams of Calcium Phosphate will be formed Ca3 PO4 2 6 3 Ca NO3 2 2 Na3PO4 NaNO3

8 A chemist has 4 00 g of silver nitrate and needs to prepare 2 0 L of a 0 010 M solution Will there be enough silver nitrate If so how much silver nitrate will be left over

3 H g N 9 2 NH3 9 600 mL 200 mL 400 mL To have a 3 1 ratio of volumes reacting 600 mL of H will react with 200 mL of N to produce 400 mL of NH3 leaving 200 mL of N unreacted At the end of the reaction the flask will contain 400 mL of NH3 and 200 mL of N PRACTICE 12 13 What volume of oxygen will react with 15 0 L of propane C3H8 to form carbon dioxide and water What volume of carbon dioxide will be formed What volume of water vapor will be formed C3H8 g 5 O2 3 CO g 4 H O 9

This portion of the exam requires that you complete the following problems on a sheet of paper using dimensional analysis All work should have the problems in the same order has shown below be neat correctly use dimensional analysis except as indicated as not needed such that the units and descriptions cancel use scientific notation when large or small numbers are present show final answers with the correct number of significant figures and units have final answers for each questions underlined Submission Once you have completed this part of the exam you should take a picture of your work make sure it is it and submit it by selecting the Part B test heading above You will only

Be sure to answer all parts How many milliliters of a 5 5 M NaCl solution would be needed to prepare each soluti a 55 mL of a 1 9 M solution b 150 mL of a 0 68 M solution mL mL

3 In the reaction 2 Zn 1 0 2 ZnO how many moles of zinc oxide can be produced from 150 g each of zinc and oxygen

The following are all strong bases LiOH NaOH True False KOH Cu OH 2 Al OH 3

3 points Use the balanced chemical equation for the reaction of sodium with chloride to produce sodium chloride AND stoichiometry to calculate the amount of chlorine gas that was used with each given mass of sodium Round answers to 2 decimal places Na g Cl g Reaction Data Mass Na g Mass NaCl g 1 2 2 5 4 For 1 00 g Na type your answer type your answer 2 5 5 6 5 6 5 g of Cl is consumed For 2 00 g Na g of Cl is consumed type your answer g of Cl is consumed And for 2 50 g Na 03

Consider the reaction 2 NO N 2 CO2 Molecular art is used to show the starting materials for the reaction Determine the number of molecules of the products using the balanced equation and following the law of conservation of mass

Write the short hand and noble gas electron configuration for the following elements Iron Molybdenum

Why does the glossary for New York s Museum of Modern Art often include links to works by individual artists In this way the museum hopes to attract new visitors O These works illustrate the concepts defined in the glossary When a definition is very short the links make it appear longer

Which is a root cause of limited vocabulary in adults O Since reading challenging texts is one of the strongest ways to develop broad vocabularies a root cause is not being exposed to challenging and interesting texts throughout life O Since broad vocabulary is crucial only for writers and English majors it simply isn t focused on in other areas of study Since all vocabulary knowledge is fixed by the time we are teenagers a root cause of weak vocabularies in adults is not having access to books or reading materials as a child O Since vocabulary development depends on the way words are taught in school a root cause of a weak vocabulary comes from focusing on testing vocabularies instead of working vocabularies

14 C3H8 5 023CO H O How many moles of propane gas C3H8 will pane C Hs will burn in 2 burn in 250 0 g of oxygen

25 0 mL of 0 212 M NaOH is neutralized by 13 6 mL of an HCI solution The molarity of the HCI solution is 0 212 M 0 115 M 0 500 M 0 390 M 0 137 M 00000

Which of the following gives the balanced equation for this reaction K3PO4 Ca NO3 2 Ca3 PO4 2 KNO3 KPO 4 CaNO 3 KNO 3 K 3PO 4 Ca NO 3 2 Ca 3 PO4 2 3KNO 3 2 K 3PO 4 Ca NO 3 2 Ca 3 PO4 2 6KNO 3 2K 3PO 4 3Ca NO 3 2 Ca 3 PO4 2 6KNO 3 K 3PO 4 Ca NO 3 2 Ca 3 PO4 2 KNO 3

In the reaction of nitrogen gas N 2 with hydrogen gas H 2 to form ammonia gas NH 3 how many moles of hydrogen are needed to react with two moles of nitrogen N2 3H2 2NH3 2 moles 4 moles 6 moles 8 moles 5 710 moles

vas zaim food and ti angton When Mark Watney wakes up after being impaled his oxygen levels are low If his space suit only has 8 2 x 1026 molecules of oxygen left how many moles of oxygen are present DOYL

idence e unbalanced redox reaction that occurred in the flask is Al s H O 1 HJ4J a Identify which element is being oxidized and which element is being reduced b Balance the redox equation in basic solution From the mass of aluminum you used determine the volume in L of hydrogen gas produced assuming conditions are at 22 C and 1 05 atm You need stoichiometry and the ideal gas law to solve this problem

Sulfur dioxide reacts with hydrogen sulfide to produce sulfur and water Determine the yield of sulfur if 35 0 L of sulfur dioxide were used and the actual amount of sulfur S in lab was 115 g 3 sig Figs 502 g 2H S g 3S s 2H O g TyRO VAL

Methane combust with oxygern through the following reaction CHA 202 CO 2H O How many grams of carbon dioxide are produce when 16 0 g of methane and 48 0 g of oxygern gas combust Molar masses CH4 16 0 g mol O 32 0 g mol CO2 44 0 g mol g Your answer should be rounded to 3 significant figures Do not include units in your answer

Question 3 Why does Paine say that it is unreasonable to suppose that France or Spain would offer any assistance in his essay Common Sense Points 2 Because they consider Americans as rebels Because they are Britain s allies O Because they would be sufferers by the consequence O Because they are enemies to the subject of Great Britain

If a person is going to make a 6 78L of a 2 0M HBr acid solution what mass in grams of HBr would need to be measured out round Hydrobromic your answer to two decimal places Question 3 A scientist has a stock solution with a concentration of 10M If they need 300mL of a 3 62M solution what volume in milliliters of the stock solution would they use to make it Round YOUR 0 25 pts u

1 point Each of the following diagrams represents a pair of ions The distance between the ions is the same for each pair The pair that has the greatest repulsion force O O 3 2 2 34 2 2 2 2

Pre lab Questions 4 pts each 20 pts total Overview 1 Complete the sentence Stoichiometry is the study of among and products in a chemical 2 How many significant figures does the simulation use for numerical values relationships Learning Outcomes 3 Copy the sentence for learning outcome 4 and circle underline or highlight the term that refers to the

X For the following question s consider the following equation 2Mg O2 2MgO How many grams of magnesium are needed to react with 44 2 g of O 2

Directions Place a plus to the left of the statements that agree with what was said in the textbook Place a minus to the left of the statements that do not agree with the textbook Then circle the word or words that need to be changed and write what they need to be changed to so that the statement is true 1 Anything that causes change must have energy 2 Kinetic energy is energy in the form of motion 3 The joule is a unit used to measure energy 4 Chemical energy stored in food cannot be transformed into mechanical energy 5 If you drop a softball from just above your knee the kinetic energy of the ball just before it hits the ground is about 1 joule 6 Potential energy is the energy that is stored in the interactions between objects 7 A rock at the edge of a 200 m high cliff has more potential energy than an equal sized rock at the edge of a 600 m high cliff 8 The energy stored in foods and fuels is chemical potential energy 9 Gravitational potential energy is often released by burning substances Directions Fill in the missing information in the chart below which compares kinetic energy and gravitational potential energy Characteristic Kinetic energy Gravitational potential energy

Data Table 2a Effects of KI Concentration Trial KI HCI Starch H O Na S O H O Time Time Average Rate drops drops drops mL sec sec drops drops Time 1 Tavg Tavg sec 1 2 3 4 5 6 7 8 64 8 8 6 422 2 NNNN 2 2 2 2 22 2 4 4 4 4 4 4 4 4 0 0 2 2 4 4 6 6 7 7 7 7 7 7 7 0 4 201 7 U 0 4 0 4 21 43 0 4 0 4 19 25 0 4 0 4 0 4 16 01118 21 125 37 23 45 122 45 11 75 20 11 169 26 80

Question 1 of 20 Which character is the best example of an archetype A A gravedigger who enjoys playing online video games all day OB A nice old man who carves ritual masks out of exotic woods C A grandmother who suddenly decides to run for city council D A greedy executive who will stop at nothing to increase profits SUBM

Be sure to answer all parts The average nicotine C 0H14N2 molar mass 162 3 g mol content of a cigarette is 2 26 mg Supp individual smokes one pack of 20 cigarettes a day Use proper scientific notation to report your a a How many moles of nicotine are smoked in a day x 10 select mol nicotine b How many molecules of nicotine are smoked in a day X 10 Select molecules nicotine

Which of the following is NOT a characteristic that strong acids and strong bases have in common They can both conduct electricity They can both be safe to touch and taste They can both have corrosive properties They can both produce neutralization reactions The injury was not because of a fallen object Professor Astro was doing yoga in the gym The victim was not chemically poisoned Mrs Bio was shelving books in the library

Select all that apply Which of the following metals can react with water Ca Au Li

N H 5 The reaction of hydrogen gas with nitrogen gas produces ammonia NH3 If you start with 15 g of hydrogen and 45 g of nitrogen what mass of ammonia can be produced NH3 If the student actually receives 51 5 g of NH3 what is their percent yield

Calculate the mole fraction of the solvent and solution in a solution composed of 46 85 g of codeine C H NO3 in 125 5 g of ethanol C H OH Xc C18H21 NO3 X Type numbers in the boxes aby Part 1 5 points aby Part 2 5 points 10 points 4

How many grams of lithium hydroxide LiOH will be formed from 4 959 liters of a 1 5M lithium nitride Li N solution Li N aq H O NH 13 g LiOH aq

saliva FIGURE 9 8 select blood select stomach select pancreas select large intestines urine select saliva pH 5 8 7 1 Variation in pH Values in the Human Body esophagus small intestines select pancreas pH 7 5 8 8 liver small intestine pH 8 5 select blood pH 74 stomach pH 1 6 1 8 large intestine pH 5 0 7 0 urine pH 4 6 8 0

3 How many moles are there in 1 95 x 1026 atoms of lithium

Which of the following is the controlling idea of the sentence Cell phone radiation can increase the possible cancer risk Cancer risk Cell phone Can increase possible cancer risk

1 point How many carbon atoms are represented in the formula CH3 3C CH 2CHO 5 3

Which among the following is NOT an example of a suspension O Sand in water O Dirt in water O Salt in water Clay in water

2 The volume of a sample of nitrogen N gas was measured to be 55 6 L at STP What is the mass of this sample

Consider the oxidation reduction reaction Na2SnO2 Bi OH 3 007 Bi Na2SnO3 H O What is the coefficient of Bi in the balanced equation 4 None of these 6 10 7 1 8 8 9 12 LOJLL 10 5

In a chemical reaction the total mass of the products compared to the total mass of the reactants is always equal always smaller always larger sometimes smaller and sometimes larger

Directions Fill in the blank with the most appropria A are the starting substances in the reaction while are the new substances that are formed The large numbers in front of some of 69 the formulas are called These numbers are used to the equation because chemical reactions must obey the law of matter The number of atoms of each element on both because matter cannot be When balancing equations the only numbers Remember that of sides of the equation must be 3 that can be changed are must never be changed in order to balance the equation or Balance the following equations Show all work 1 2 Al C3H8 tells the story of a chemical reaction AI NO3 3 O2 O2 Al2O3 CO NaOH H O Al OH 3 NONO

Diameter of Click here to enter Click here to enter penny text 0 01905m 1 0cm Click here to enter Click here to enter text text Height of ounter table Width of textbook Click here to enter text Click here to enter text Click here to enter text 19 05m Click here to enter text Click here to enter text Click here to enter text Click here to enter text Click here to enter text OP

Be sure to answer all parts How many grams of NaCl are contained in each of the following volumes of a 1 18 M solution b a 0 65 L b 56 mL

Be sure to answer all parts What is the molarity of a solution prepared using the given amount of solute and total volume of solution a 28 0 g of KCI in 670 mL of solution b 15 0 g of Na CO3 in 3 5 L of solution M M

Be sure to answer all parts Calculate the value of H3O from the given OH and label the solution as acidic or ba a 6 00 10 3 M H O select b 7 22 10 8 M H O x 10 X 10 M M

order CaCl CCl and C H OH from least to most soluble in water Most Soluble in H O Least Soluble in H O m V V Fill in the blanks by selecting one option from each menu ab Part 1 3 points ab Part 2 3 points ab Part 3 3 points 9 points

1 The total number of atoms in 0 111 moles of Fe CO 3 PH3 2 is

3 What types of intermolecular forces are present in each molecule a Cl b HCN c HF d CH Cl P b C d London dispersion select select select select select Dipole dipole select select select select select Hydrogen bonding select select V select select e H select