General Questions and Answers

What is the formula for sodium hydrogen sulfate? What is the formula for potassium cyanide ? What is the formula for potassium hydrogen carbonate?

Use the information in the table and your graph to answer the following questions. 1. At about what temperature will 100 g of water dissolve equal amounts of potassium chloride and barium hydroxide? 2. At about what temperature will 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water? 3. If 100 g of sodium nitrate are dissolved in 100 g of water at 60°C, is the solution formed saturated, unsaturated, or supersaturated? 32 g of copper(II) sulfate are dissolved in 100 g of water at 20°C, is the solution produced saturated, unsaturated, or supersaturated?

What is the name of the compound with the formula MgBr2 ? What is the name of the compound with the formula Na₂O ? What is the name of the compound with the formula BaCl₂?

Suppose 4.61 g of zinc was allowed to react with hydrochloric acid to produce zinc chloride and hydrogen gas. How much zinc chloride in grams should you get? 1 Zn(s) + 2 HCl(aq) Ⓡ1. ZnCl2(aq) + 1 H2(g)

What was one important achievement of Mohandas Gandhi? A. He forced France to recognize Algerian independence. B. He helped end decades of racist rule in South Africa. C. He guided the process ending the Cold War. D. He led the nonviolent Indian independence movement.

Mr. Davis is trying to make a 0.30 M solution of KOH and needs your help. If Mr Davis added 0.15 moles of KOH to the flask already, how much water should he add to make the solution?

A partial spectrochemical series is I < Cr < F<H₂< NH3 < en < CN". Which of the following complex ions would absorb light with the longest wavelength? a. [Co(en)3]2+ b. [Co(H₂0)612+ c. [Co(Cl)614- d. [Co(CN)614- e. [Co(NH3)6]2+

In a simple binary ionic compound, which ion (cation/anion) has the same name as its parent element? cation anion both cation and anion neither cation nor anion

How have people viewed adolescence in the past? What led them to believe as they did?

What was the purpose of poll taxes? to make elections more secure to disenfranchise Confederate Army veterans to make voting locations more easily accessible to disenfranchise African Americans

The reaction below shows potassium oxide being produced (KO₂) by combining oxygen (O₂) with potassium (K). The mass of potassium is 50 grams and the mass of oxygen is 12 grams. What is the mass for the potassium oxide that was produced? * 62 grams O160 grams 12 grams O50 grams O2 + K -> KO2

If an octahedral complex has a crystal field splitting of Ao = 4.73 x 10-19 J/particle, what is the wavelength, expressed in nanometers, of the photon which can be absorbed? Data: Speed of light = 2.9979 x 108 m/s and Planck's constant is 6.6256 x 10-34 J s. a. 4.19 x 102 nm b. 581 nm c. none of the other answers are correct d. 495 nm e. 517 nm

In the octahedral complex ion, ML+, the central metal has a total of 6 d electrons. If L is a weak field monodentate ligand, the number of unpaired d electrons on the central metal ion is a. none of the other answers are correct b.0 c. 2 d. 3

Identify chemical properties of metal. Select all that apply. ductile react with hydrogen to produce hydrides donate electrons good electrical conductor

Zn(s) + CuSO4(aq)-> Cul(s) +ZnSO4(aq) In the above reaction, if the actual yield of copper metal is 0.392 g and theoretical yield copper metal is 0.507 g, calculate the percentage yield (% yield). 0.773 % 77.3% 0.199 % None of the above.

What type(s) of intermolecular forces exist between NH3 and PO43-? A) dispersion forces B) dispersion forces, ion-dipole, and dipole-dipole C) dispersion forces and dipole-dipole D) dispersion forces and ion-dipole E) dispersion forces, ion-dipole, dipole-dipole, and hydrogen bonds

Which one of the following substances will not have hydrogen bonding as one of its intermolecular forces? A) CH3COCH 3 B) H₂O2 C) CH3CH₂OH D) N₂H₂ E) CH3NH2

What is the mole fraction of HCI in a solution that is prepared by dissolving 25.5 g of HCI in of water? The density of the solution is 1.0 g/mL. A) 0.0155 B) 0.0319 C) 0.984 D) 0.874 E) 32.0

The equation for the formation of fluorapatite, a crystal precursor during the production of phosphorus, is as follows: xCa3(PO4)2 + CaF2 → 2Ca5(PO4)3 If the above chemical equation is balanced, what would the value of x be? A.1 B.2 C.3 D.4 E.5

The molality of a solution that contains 36.6 g of NaCl in 200.0 g of water is (Molar mass of NaCl = 58.44 g/mol) A.3.66 B.3.13 C.31.3 D.36.6 E.0.36

Give the name of the following Type I/ Type II binary compounds a) KF b) MgBr2 c) FeCl3 d) Cr2(SO4)3 f) CuHCO3 g) Cr(NO3)2 i) Pb(CO3)2

Use the balanced equation 2 Li + Cl₂ - 2 LICI. How many grams of chlorine gas, Cl₂ are required to produce 10 moles of lithium chloride, LICI? A 355g Cl₂ B 709g Cl₂ C 20.0 mol Cl₂ D 0.0705g Cl₂

A sample of an unknown element, weighing 3.00 g was burned in an excess of oxygen in a bomb calorimeter. The temperature of the calorimeter rose from 10.00 °C to 44.68 °C. If the heat capacity of the calorimeter and contents is 10.89 J/ °C, how much energy is released from burning this sample? 154 kJ 154 J 378 J 378 kJ

In the squares below, draw how you think particles are arranged in the three states. Use spheres to represent the particles and label each box with the state it represents. When changing from one state to another, what happens to particles in terms of energy?

he predominant intermolecular force in water is A) London dispersion forces B) hydrogen bonding C) ion-dipole forces D) dipole-dipole forces E) ionic bonding E) ionic bonding B) hydrogen bonding D) dipole-dipole forces A) London dispersion forces C) ion-dipole forces

7.Elemental iodine (I₂) is a solid at room temperature. What is the major attractive force that exists among different I₂ molecules in the solid? A) London dispersion forces B) dipole-dipole interactions C) ionic-dipole interactions D) covalent-ionic interactions E) dipole-dipole attractions

5.When KBr dissolves in water, aqueous K+ and Br- ions result. The force of attraction that exists between K+ and H2O is called a(n) interaction. A) dipole-dipole B) ion-dipole C) ion-ion D) London dispersion force E) hydrogen bonding

1.) The principal reason for the extremely low solubility of NaCl in benzene (C6H6) is the A) strong solvent-solvent interactions B) hydrogen bonding in C6H6 C) strength of the covalent bond in NaCl D) weak solvation of Na+and Cl-by C₂H6 E) increased disorder due to mixing of solute and solvent E increased disorder due to mixing of solute and solvent D) weak solvation of Na+and Cl-by C6H6

When the following reaction Cr(OH)3(aq) + CIO¯aq) =Cro42 (aq) + Cl (aq) (basic) Is balanced with the smallest set of integer stoichiometric coefficients the coefficients of OH and H₂O are a. 2, 6 b. 3, 7 c. none of the other answers are correct d. 4, 5 e. 5, 8

24.3 grams of a metal was heated to 95.0°C and placed immediately into an insulated container containing 50.0 grams of water at 25.0°C. The final temperature of the water is 26.8 "C. What is the specific heat of the metal? 0.163 J/g °C 0.227 J/g °C 2.43 J/g °C 4.40 J/g °C 1060 J/g °C

Which of the following statements is NOT true about molarity? It is a quantitative way of describing the amount of solute dissolved into a solution. To calculate molarity, you need to know the molarity of the solvent. It is the moles of solute in one cubic decimeter of solution.

A piece of metal is heated, then submerged in cool water. Which statement below best describes what happens? The temperature of the metal will increase The temperature of the water will increase The temperature of the metal will increase and the temperature of the water will decrease The temperature of the metal will decrease and the temperature of the water will increase

A 16.0 g sample of unknown metal was heated from 0°C to 35.0°C. It absorbed 246.4 J of energy as heat. What is the specific heat of this piece of metal? 240 J/g°C 3.67 J/gºC 0.44 J/g°C 1.34 J/gºC

Which of the following statements about acids is NOT true? Certain fruits and vegetables contain acids. Tasting acids is permitted in a chemistry lab. The neutralization of an acid with a base produces salt and water.

In which one of the following processes is the system endothermic? A) A process in which the air around the reaction becomes warmer. B) A process taking place in solution where the solution temperature decreases. C) The combustion of natural gas. D) The formation of frost on a window.

A hydrate of CuSO4 with a mass of 4.224g is heated several times to a constant mass. The mass of anhydrous CuSO4 is 2.7004g. Determine the formula of the Hydate of CuSO4. A.5CuSO4 B.CuSO4. 4H₂O C. 5CuSO4.H₂O D. CuSO4.5H₂O E. CuSO4.2H _O

Which of the following are characteristic of naturalistic observation? Select all that apply. technique to study social hierarchies and interactions among animals often difficult to set up and control relies on looking at past records or data sets to look for interesting patterns or relationships

Which of the following statements is false? a. The name of the complex [Cr(NH3)4Cl2]NO3 is tetraammine dichloro chromium (III) nitrate b. A bidentate has two domor atoms c. Ambidentates cannot form linkage isomers d. If a substance and its mirror image are not superimposable they are enantiomers e. none of the other answers are correct

How many grams of Cu(s) can be plated out of solution by passing a constant current of 8.5 A through a solution of CuSO4 for 75 min? Recall the Faraday is 96500 C/mol, and the atomic mass of Cu is 63.55. a. none of the other answers are correct b. 15.6 g c. 5.88 g d. 12.6 g e. 33.2 g

One role of the human skin is to help protect the body against bacteria. The optimal pH of human skin What is true about the pH of human skin? It is basic. It is acidic. It is neutral. It is both basic and acidic.

A silver nitrate solution is used to develop fingerprints on porous surfaces such as wood. A solution is prepared by dissolving 6.00 g of AgNO3 in water to a final volume of 200 mL. What is the molarity of the solution? Mass= 170_g Volume = mL Molar mass of NaCl = mL = 1 dm^3 Show the worked out problem in the space below.

In this experiment, you will be mixing aqueous solutions of sodium carbonate and calcium chloride to produce solid calcium carbonate. Na₂CO3(aq) + CaCl₂(aq) → 2 NaCl(aq) + CaCO3(s) Order the steps required to predict the volume (in mL) of 0.100 M calcium chloride needed to produce 1.00 g of calcium carbonate. There is an excess of sodium carbonate.

Describe the properties of ammonium lauryl sulfate that make it a feasible surfactant. Properties can include strength, conductivity, solubility, reactivity, durability, and state of matter.

When carbon disulfide burns in the presence of oxygen, sulfur dioxide and carbon dioxide are produced according to the following equation. CS₂ (l) + 3 O₂ (g) CO₂ (g) + 2 SO₂ (g) a. The actual yield of SO₂ is 40.5 g and the actual yield is 42.2 g. What is the percent yield? Insert photo of work here:

Balance the following equation: ___AgNO3 + Cu → Ag+ Cu(NO3)2 If 0.7 grams of Cu and 3.49 g of AgNO, are available, find out how many grams of Ag can be produced. (Limiting Reagent Problem) If 1.74 grams of Ag was actually produced, find the percent yield of the reaction.

Balance the following chemical equation: Al(s) + H₂SO4(aq) → Al₂(SO4)3(aq) + H2(g) Which answer choice below has the correct coefficient pattern?

Silver nitrate reacts with potassium iodide to form silver iodide and potassium nitrate. AgNO3+ KI → AgI + KNO3(l) a. If 568 g of silver nitrate react with 641 g of potassium iodide, which reactant is limiting? (1) b. What is the theoretical yield (in grams) of silver iodide? (1) c. What mass of the excess reactant is left over? (1) d. If 621 g of silver iodide are produced, what is the percent yield? (1)

Phillips Milk of Magnesia is an antacid (a medicine used to neutralize stomach acid) containing the active ingredient Magnesium hydroxide. Stomach acid is mostly Hydrochloric acid. Write the chemical equation showing how Milk of Magnesia neutralizes stomach acid.

Solid potassium chloride reacts with oxygen gas to produce solid potassium chlorate. Write and balance a chemical reaction. What is the enthalpy of the reaction? Is the reaction endothermic or exothermic?

Radiant energy is A. the energy stored within the structural units of chemical substances. B. the energy associated with the random motion of atoms and molecules. C. solar energy, i.e. energy that comes from the sun. D. energy available by virtue of an object's position.