General Questions and Answers

15 00 g of NaOH were added to 185 00 g of water 1 What is the m m m m g NaOH g soln g solnx 100 2 How many grams of NaOH in 444 44 g of the solution g NaOH m m

lowing formulas 2 NH3 Tap in the fields to enter the answers directly OR tap on the Number Pad icon to use our built in Number Pad Nitrogen N Hydrogen H 7 4 3005 www 70 C

lowing formulas 3 H SO4 5 H O Tap in the fields to enter the answers directly OR tap on the Number Pad icon to use our built in Number Pad Hydrogen H Sulfur S Oxygen O 400G 7 7 spring inden de man ng the OCE

9 What is the mass of NaCl required to make 140 grams of a 12 solution of NaCl in water 144 16 8M 112 foo 100 10 A 15 M concentrated stock solution of NaCi was used to prepare 10 liters of diluted 1 5 M solution What is the stock volume 11 A 6 M concentrated stock solution of NaCl is used to prepare 3 liters of diluted 4 M solution What is the stock volume 12 A 10 M concentrated stock solution of NaCl is used to prepare 2 liters of diluted 1 M solution

4 Identify each of the following reactions as decomposition synthesis single replacement or double replacement A 2 NaBr Ca OH z CaBr2 2 NaOH B 2 NH3 H SO4 NH4 2SO4 C 3 Pb 2 H3PO4 3 H2 Pb3 PO4 2 D Li3N 3 NH4NO3 3 LINO3 NH4 3N E 3 HBr Al OH 33 H O AlBr3 F Na3PO4 3 KOH 3 NaOH K3PO4 G MgCl2 Li2CO3 MgCO3 2 LiCl H Pb FeSO4 PbSO4 Fe I CaCO3 CaO CO2

WIE How much HNO3 would you have to add to 211g of NaHCO3 to produce 152g of NaNO3 45g of H O and 61g of CO2 HNO3 NaHCO3 NaNO3 H O CO2

If 1 0 gallon of ethanol is theoretically produced what is the estimated actual amount produced based on the efficiency of the factory 1 1 10 Not Listed 0 90 0 10

Two miscible liquids were mixed to the point of saturation It was found that there was 25 00 mL of liquid A in every 350 00 mL of the solution 1 What is the V v V V mL A 100 mL soln 2 How many mL of liquid A are in 25 00 mL of the solution mL soln mL A mL soln 2 mL A

that ect the lowest possible whole number coeffic balance the chemical equation Suggestion Perform an atom count for each element to insure correctness Ca OH 2 Reactants Ca C CO CaCO3 Products Ca C Atom Count Optional Recommended H O 14979 1 Prog Di W 4 Tap for C Vie

Exercise C For each of the reactions listed below use the reactions after it to de enthalpy of the first reaction Reaction 1 Find the AH for the reaction below given the following reactions and subsequent AH values C4H10 g 6 O2 g 4CO2 g 5H O g 4C s 5 H g C4H10 g H g 2 O2 g H O g C s O2 g CO g 2NH3 g N2H4 1 H2 g 2NH3 g N2 g 3H2 g CH O g H2 g CH 40 1 AH 2672 5 kJ mole AH 241 8 kJ mole AH 493 5 kJ mole Reaction 2 Find the AH for the reaction below given the following reactions and subsequent AH values N2H4 1 CH4O 1 CH O g N2 g 3H2 g AH AH AH the 22 5 kJ 57 5 kJ 81 2 kJ

Calculate the molarity and normality of 5 7 of Ca OH 2 in 450 mL of solution 1 Only the molarity can be calculated fro this information 2 0 34 M 0 17 N 3 0 34 M 0 34 N

3 Ammonia NH is used throughout the world as a fertilizer To manufacture ammonia nitrogen N is combined with hydrogen H in a synthesis reaction If 92 7 g N and 265 8 g H are used how many grams of ammonia could be produced Which substance is the limiting reactant N H NH N H NH

Find the molecular formula of a compound that has 0 6g of nitrogen 1 4g of O and a molar mass of 92 1 g mol Use the editor to format your answer Question 35 1 Point

5 Hydrochloric acid HCI which is secreted in your stomach can be neutralized in a double displacement reaction by taking an antacid such as aluminum hydroxide Al OH 3 If 34 0 g of HCI is secreted and 12 0 g Al OH is taken how many water molecules are produced Which substance is the limiting reactant HCI HCI Al OH 3 Al OH 3 H O AICI H O AICI3

An iron block is allowed to cool after being heated in an oven as shown in the diagram below What is the change in heat for the block if it is known to have a mass of 1200 g The specific heat of iron is 0 450 J gC 32000 J Q O 32000 J iron block A 45900 J T 85 C T 25 C 011 10 J

At a certain temperature, the equilibrium constant K for the following reaction is 4.76 × × 10¹¹: Br₂(g) + OC1₂(g) → BrOCI(g) + BrCl(g) Use this information to complete the following table. Suppose a 16. L reaction vessel is filled with 0.40 mol of BrOCI and 0.40 mol of BrCl. What can you say about the composition of the mixture in the vessel at equilibrium? What is the equilibrium constant for the following reaction? Be sure your answer has the correct number of significant digits. BrOCI(g) +BrCl(g) Br₂(g) + OCl₂(g) What is the equilibrium constant for the following reaction? Be sure your answer has the correct number of significant digits. 2 Br₂(g) +20C1₂(g) 2 BrOCI(g) +2BrCl(g) There will be very little Br₂ and OCI2. O There will be very little BrOCI and BrCl. O Neither of the above is true. K = 0 K = 0

4Fe (s) + 302 (g) → 2Fe2O3 (s) When 25.75 g of O2 react with excess Fe, and this is the only reaction which occurs, theoretically how many grams of Fe2O3 should be produced? Keep the answer with 2 decimal places. Do not write unit in answer.

A helium filled balloon has a volume of 2.3 L, a temperature of 25 °C, and a pressure of 17.3 psi. How many grams of helium does the balloon contain. 6.5 g 0.44 g 0.11 g 5.2 g

Name the following compounds or Figure out the formula: MgF2 Ca(OH)2 TiBr4 HCI

What were Dalton's four ideas about atoms/compounds?

The reaction C4H8(g) → 2C₂H4(g) has an activation energy of 262 kJ/mol. At 600.0 K, the rate constant, k, is 6.1 x 10-8 s-¹. What is the value of the rate constant : 870.0 K?

Which of the following is/are synthesis reactions? 1. 1CH4 (g) +2O₂ (g) --> 1CO₂ (g) + 2H₂(l) 2. 1 Ca(s) + 1CO₂ (g) --> 1 CaCO3 (s) 3. 2Mg(s) + 1O₂ (g) --> 2Mg(s) 4. 1PbCO3 (s)--> 1Pb(s) + 1CO₂ (g) a 4 only b 2 and 3 c all are synthesis d 2, 3, and 4

Label if each is lonic, Covalent, or Both NH3 Na3PO4 K₂S H₂SO4

3a) Write a balanced molecular equation for the following reaction. Ba(NO3)2(aq) + Li₂CO3(aq) → b) Write a complete ionic equation for the reaction you have written above. c) Identify the spectator ions d) Write the net ionic equation for the above reaction.

2) Write equations to show dissociation for the following compounds: FeCl3 K₂SO4 Li3PO4 NH4OH

A particular reactant decomposes with a half-life of 143 s when its initial concentration is 0.255 M. The same reactant decomposes with a half-life of 225 s when its initial concentration is 0.162 M. Determine the reaction order. 0 2 1 What is the value and units of the rate constant for this reaction?.

6. Refer to Technique 16B. a. Remove the drop suspended from a pipet tip by... b. The finger used to control the delivery of liquid from a pipet is the . . . c. What should be done with the last bit of liquid remaining in the pipet after delivery? d. Most pipets are calibrated as TD 20°C. Define TD; what is its meaning regarding the volume of liquid a pipet delivers?

The reaction A+B --> C+D rate= K[A][B]2 initial rate: has an initial rate of 0.0650 M/s. What will the initial rate be if [A] is halved and [B] is tripled? initial rate: What will the initial rate be if [A] is tripled and [B] is halved?

A bone is found in an ancient African cave and tested out at only 10% of its original amount of carbon-14. Estimate the age of the bone if the half- life of carbon-14 is about 5700 years. A bone is found in an ancient African cave and tested out at only 10% of its original amount of carbon-14. Estimate the age of the bone if the half-life of carbon-14 is about 5700 years. Decay Model: M = Moe"

Distinguish between molecules, formula units and atoms. Write an example of each.

Write a nuclear equation for the following: Plutonium-239 Phosphorus-32 Cesium-137

Which of these explains what a law is? A. The current model of the atom is definitely correct. B. A possible explanation for why something happens. C. A set of observations about an experiment. D. Observations about something that happens in the world.

Calculate the density of a substance that has a mass of 17g and takes up a volume of 18.5 cm³ Will this substance float or sink in water?

Explain the difference between an Isotope and an Ion?

In Giovanni's "Ego Tripping," what is most likely the reason Giovanni uses so many allusions to describe herself? to show that she is a powerful, independent woman to show that she is well educated to provide a visual for the reader to brag on her knowledge

A reactant decomposes with a half-life of 149 s when its initial concentration is 0.318 M. When the initial concentration is 0.590 M, this same reactant decomposes with the same half-life of 149 s. What is the order of the reaction? What is the value and unit of the rate constant for this reaction?.

Calculate the rate constant, k, for a reaction at 59.0 °C that has an activation energy of 84.5 kJ/mol and a frequency factor of 4.88 x 10 s-¹.

"Eek! I am so excited to go to the concert next month. I already bought our tickets," said Raina. "Oops! I totally forgot to tell you that I can't make it," replied Joan. Underline 2 examples of emotive language below and explain below.

Read the following excerpt from Amy Tan's story, "Two Kinds." What feature of Postmodernism does this excerpt represent? "We didn't immediately pick the right kind of prodigy. At first my mother thought I could be a Chinese Shirley Temple. We'd watch Shirley's old movies on TV as though they were training films. My mother would poke my arm and say, 'Ni kan. You watch. And I would see Shirley tapping her feet, or singing a sailor song, or pursing her lips into a very round O while saying "Oh, my goodness." Ni kan," my mother said, as Shirley's eyes flooded with tears. "You already know how. Don't need talent for crying!" Utopian setting used to comment on contemporary life Blending of elements from two cultures Decreasing contact with the actual, physical world Truth is absolute and can be discovered through observation

Classify each of the following reactions as Combination, Decomposition, Single Displacement or Double Displacement. a) Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s) b) 2Na(s) + Cl2(g) → 2NaCl(s) c) 2HgO(s) → 2Hg(l) + O2(g) d) AgNO3(aq) + NaBr(aq) → AgBr(s) + NaNO3(aq)

Consider the structure of your cyanine dye. Draw all the resonance structures that contribute to the conjugation of the central chain (the atoms from one nitrogen atom to the other, inclusive) that we are considering to constitute a one-dimensional box, even those that contribute only slightly. Show that the terminal six-membered rings are not strongly conjugated to the central chain by observing that (i) conjugation in the central chain is independent of conjugation in the terminal rings; and (ii) resonance structures conjugating the terminal rings to the central chain do not keep the rings fully aromatic. Dye used: 1,1' Diethyl-2,2' carbocyanine Iodide (D2CI)

Using solubility rules (Chapter 4) classify each of the following compounds as soluble or insoluble in water. PbCl2 Na₂CO3 Al(OH)3 Ca(NO3)2

What is the tone in the following excerpt from Amiri Baraka's poem, "Why Is We Americans?" "I'm gone be here, if I want, like I said, self determination, but I ain't come from a foolish tribe, we wants the mule the land, you can make it three hundred years of blue chip stock in the entire operation. We want to be paid, in a central bank the average worker farmer wage for all those years we gave it free." demanding anxious joyous lighthearted

What feature of Postmodernism is best represented in Corky Gonzáles's poem, "I Am Joaquin"? Truth is absolute and can be discovered through observation Use of multiple points of view and perspectives Decreasing contact with the actual, physical world Use of dystopian settings to comment on contemporary life

How many moles of Salicylic Acid were used in the experiment? (MW of Salicylic acid = 138.12 g/mole)

If I have 720 mL of methane gas held at a pressure of 344.4 kPa and a temperature of -50°C, how many grams of methane gas do I have? Methane gas = CH4 (g) R = 8.314 kPa L/mol-K

Experimental Procedure, Part C.3. The mass of a beaker is 5.333 g. After 5.00 mL of a concentrated hydrochloric acid solution is pipetted into the beaker, the combined mass of the beaker and the hydrochloric acid sample is 11.229 g From the data, what is the measured density of the hydrochloric acid solution?

A solution is prepared by mixing 0.6332 moles of NaNO3 with 483.0 g of water. What is the molality (m) of the solution? Do not write unit in answer. Report your answer with three places past the decimal point.

Which of the following is considered paraphrasing? Putting someone else's words into your own words Omitting some sentences from the original source Rearranging the order of the words Using a thesaurus to change certain words from a quotation

Which of the following literary techniques is used in this excerpt from Gwendolyn Brooks's poem, "The Truth"? "Though we have wept for him, Though we have prayed All through the night-years- What if we wake one shimmering morning to Hear the fierce hammering Of his firm knuckles Hard on the door? Shall we not shudder?- Shall we not flee Into the shelter, the dear thick shelter Of the familiar Propitious haze?" irony allusion dystopia hyperbole