General Questions and Answers

Ammonia and oxygen can react to produce nitrogen and water. Following is the balanced reaction: 4NH₁+30₂= 2N₂ + 6H₂O Suppose 28 liters of oxygen gas react completely with ammonia. How many liters of nitrogen will be produced at STP? 192.1 14.0 22.4 18.7

Consider four sealed, rigid containers with the following volumes: 50 mL, 100 mL, 250 mL, and 500 mL. If each of these contains .25 moles of helium gas at standard temperature, which container would have the greatest pressure? 50 mL 100 mL 250 mL 500 mL

A dime is found to have a volume of 0.430 mL. Using unit analysis, show what the volume of this dime is in L. Use one of the following to set up the conversion factor. 1 kg = 1000 g 1000 mL = 1 L 100 cm = 1 m 1000 mg = 1 g 1 mL = 1 cm³ 1000 mm 1 m

In the chemical reaction represented by the equation wA + XB → yC + zD, a comparison of the number of moles of A to the number of moles of C would be a(n) mole ratio. mass ratio. electron ratio. energy proportion.

Fluorite, a mineral of calcium, is a compound of the metal with fluorine. Analysis shows that a 51.87-g sample of fluorite contains 25.36 g of fluorine. Calculate the following: (a) Mass of calcium in the sample. g Ca (b) Mass fractions of calcium and fluorine in fluorite. Calculate to 3 significant figures. mass fraction Ca mass fraction F (c) Mass percents of calcium and fluorine in fluorite. Calculate to 3 significant figures. mass % Ca mass % F

A chemistry student weighs out 0.174 g of citric acid (H,C,H,O,), a triprotic acid, into a 250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1200M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the final equivalence point. Round your answer to 3 significant digits.

What is the name of the compound with the formula K₂O ? What is the name of the compound with the formula Nal ? What is the name of the compound with the formula AIF3 ?

Suppose you discover a new compound. It consists of 58.80% C, 9.87% H, and 31.33% O. What is the empirical formula of the new compound? A) C6H1003 B) C5H1002 C) CH₂O D) C4.9H9.801.9 E) C4H₂O₂

What number of moles of O₂ is needed to produce 75 grams of P4010 from P? (Molecular weight P4010284 g/mol) 0.26 moles 2.64 moles 0.5 moles 1.25 moles

For the reaction 4 KO₂ + 2 H₂O → 30₂ + 4 KOH, what mass of H₂O is needed to reach with 3.16 g of KO₂? If needed, the molar mass of each substance is given below: KO₂=71.10 g/mol H₂O = 18.02 g/mol O₂ = 32.00 g/mol KOH= 56.11 g/mol This is how you will be graded on this question: 7 pts: For showing all your work 1 pt: You have the correct final answer. - Redo

Which change to the manufacturing process for calcium oxide (Cao) would maximize the amount of CaO formed? change the heating of CaCO3 from 1,000 °C to 500 °C change from a low to a high pressure reaction system change from a closed to an open reaction system that vents CO₂ gas change from continually removing CaO from the reaction system to producing CaO in batches

6CO₂+ 6H₂= C6H1206+ 602 How many liters of O₂can be produced from 100 g of water at standard temperature and pressure? 1.49 liters 24.8 liters 80.4 liters 124 liters

Suppose 50.0 mL of 0.790 M CoCl2 solution is added to 68.0 mL of 0.310 M NiCl₂ solution. Calculate the concentration, in moles per liter, of each of the ions present after mixing. Assume that the volumes are additive. Concentration of Co²+ = mol/L Concentration of Ni²+ = mol/L Concentration of CI = mol/L

Which of the following statements is true? 1mL = 1g 1g=1 oz 1mL=1 cm³ 1g=1 cm

Given the following reaction for photosynthesis: 6CO₂ + 6H₂O=C6H₁2O6+602 How many grams of C6H₁₂O6can be produced from 100 L of CO₂ at standard temperature and pressure? 134 grams 21.9 grams 43.7 grams 0.700 grams

A sample of a gas in a rigid container at 30.0°C and 2.00 atm has its temperature increased to 40.0. What will be the new pressure? 1.50 atm 2.67 atm 2.07 atm 6.04 atm

What is the formula for potassium oxide ? What is the formula for sodium iodide ? What is the formula for aluminum fluoride ? Use the References to access important values if needed for this question.

Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHCgH4O4. This is often written in shorthand notation as KHP. If 4.72 grams of KHP are needed to exactly neutralize 28.9 mL of a barium hydroxide solution, what is the concentration of the base solution ? M barium hydroxide

Ammonia gas occupies a volume of 450 ml at a pressure of 700 mmHg. What volume will it occupy at standard pressure? (1 atm = 760 mmHg) ml. (round to nearest hundredth)

Why do you think the mayor says these lines at the end of "One of These Days"? The Mayor didn't look at him. He closed the door and said through the screen: "It's the same damn thing." None of the choices He is making peace with the dentist by reassuring him that he is loved in the town. He is making peace with the dentist by reassuring him that he will be paid. He is reminding the dentist that while the dentist may hold power in his office, the mayor holds power In the town.

How does this example show us how the strength of electrical forces can be observed at a scale we can see with our eyes? The NaCl molecules have such strong bonds with each other that do not go into solution and this prevents H₂from forming bonds to become a solid. Electrical forces between H₂molecules are weakened by the NaCl, which lowers the freezing point of the solution. NaCl has a lower freezing point than H₂molecules do, so they remain in their liquid phase for longer, preventing the solution from freezing. Electrical forces between H₂molecules are strengthened by the NaCl, which lowers the freezing point of the solution.

The balanced equation for the combustion of hexane is shown below: 2C4H14+ 150₂ 14H₂O + 8C0₂ If 364 g of hexane are combusted, how many liters of carbon dioxide are produced? Record your answer with correct significant figures.

Observe the balloons A and B above. Both balloons have a temperature of 25.0°C, contain 0.50 moles of gas sealed by the knot at the bottom, and have a volume of 2.2 L If balloon A is placed in a freezer with a temperature of -5.50°C, which of the following statements regarding the volumes of the balloons is accurate? The balloons will remain unchanged and have equal volume at 2.2L Balloon A will be smaller due to fewer moles of gas in the balloon. Balloon A will be larger due to lower pressure inside the freezer Balloon A will be smaller due to the gas particles moving slower

Choose the correct answer. The following is an example of an __ "Global warming is no big deal. It's only causing the glaciers to melt, causing major flooding around the world." exaggeration allusion understatement explanation

Who was this former aide-de-camp for General George Washington during the Revolutionary War and who led the charge for the drafting of a new constitution by writing most of the Federalist Papers? Patrick Henry James Madison Alexander Hamilton John Adams

Use the balanced equation below to answer the following question about the reaction of calcium with hydrochloric acid that produces hydrogen Ca + 2HCI = Ca + 2Cl + H₂ What is the yield in liters of hydrogen at STP if 20 1 g of calcium are completely reacted? 05.6L 11.2 L 22.4 L 44.8 L

Select the correct answer. Based on the law of conservation of energy, which statement is correct? Energy is always being added to all parts of the Universe. Energy is often destroyed in some parts of the Universe. Energy in a closed system cannot change forms. Energy in an isolated system remains constant.

Pyruvic acid is a molecule involved as an intermediate in metabolic reactions such as cellular respiration. Pyruvic acid (CH3COCOOH) is converted into acetic acid and carbon monoxide in the reaction: CH3COCOOH → CH3COOH + CO If the molar enthalpies of combustion of these substances are, respectively -1275 kJ/mol, 875 kJ/mol and 282.7 kJ/mol, use Hess's law to calculate the enthalpy of change for the given reaction [4A,2T]

Decide if the following statement is true or false: According to Dalton, only one compound may be formed between any two elements. true false

Filtration can be used to separate alloys. pure liquids. homogeneous mixtures. heterogeneous mixtures. elements in a compound.

A scientist fills a large, tightly sealed balloon with 75 L of helium at STP. Using significant figures, how many moles of helium are contained within the balloon? 3.3 moles of helium 3.348 moles of helium 18 moles of helium 3.348 moles of helium

What is the formula for potassium phosphate ? What is the formula for sodium nitrate ? What is the formula for aluminum chromate ?

Davy gained great fame and admiration through: Separating silver from silver bromide Working with local circuses A weekly chemistry newsletter A series of public lectures.

For each of the following atomic numbers, use the periodic table to write the formula (including the charge) for the simple ion that the element is most likely to form. a. element with atomic number 13: Formula of ion: b. element with atomic number 4: Formula of ion: c. element with atomic number 17: Formula of ion:

In "One of These Days," García Márquez often refers to the characters simply by their positions: the dentist and the mayor. Why do you think this so? None of the choices ONeither is passionate about his work. Each is passionate about his work. Their Interaction is shaped by their positions.

Select all the correct answers. Which compounds have the empirical formula CH₂O? C2H4O2 C3H603 CH₂02 C5H1005 C6H1206

Power is a major theme in Gabriel García Márquez's story, "One of These Days." The primary power struggle in the story occurs between ___ the dentist and the mayor the dentist and his son the mayor and his son the dentist and the town

How might the government make sure scientific research is done in an ethical way? A. By encouraging scientists to perform within their own ideas of right and wrong B. By letting public opinion determine what is ethical in scientific research C. By taking away research funds if certain ethical standards are not met D. By allowing scientists to do what they think is best

Many Mexicans who lived on land that was part of the Mexican Cession had to give up their land and relocate to Mexico. became US citizens and added to the area's population. were not allowed to own property in the United States. fought the Americans even though the war was over.

According to the kinetic molecular theory, which statement best describes the motion of gas particles? Gas particles are stationary. Gas particles are only in motion when a gas is heated. Gas particles are in continuous, random motion. Gas particles move together in the same direction.

Calculate the approximate volume of a 1.50 mole sample of gas at 15.0°C and a pressure of 3.75 atm. 173 L 5.93 L 8.65 L 9.46 L

A student working for a local grocery store is packing eggs into cartons that hold a dozen eggs. Set up the problem below and calculate the number of cartons that are equal to 456 eggs. 456 eggs X __/__ = __ cartons Drag and drop your selection from the following list to complete the answer: 1 carton 1 egg 12 cartons 12 eggs

Choose the correct answer. Exaggeration is __ a technique which overstates things for dramatic effect a technique which understates things for dramatic effect a technique which draws from political behavior to create satirical situations None of the choices

Chronological structure is a text structure common to fiction, which recounts events in the order in which they occur a text structure common to nonfiction, which recounts events in the order in which they occur a text structure common to fiction, which recounts events in the reverse order in which they occur None of the choices

Falling action is the fourth stage of a plot development in any works of fiction, in which the conflict moves toward climax the third stage of a plot development in any works of fiction, in which the conflict moves toward resolution the fourth stage of a plot development in any works of fiction, in which the conflict moves toward resolution the first stage of a plot development in any works of fiction, in which the conflict moves toward resolution

Davy used a voltaic pile to decompose the substance "potash" which allowed him to discover the substance: Helium Argon Brimstone Potassium (get it? Potash? POTASHium?)

Directions: Balance the equation below and answer the following questions about the Mole Ratios for this reaction. __MnO4 + _HCI → __Cl2 + __MnCl2 + __H₂O 1.) What is the mole ratio between MnO4 and H₂O? 2.) What is the mole ratio between MnCl2 and HCI? 3.) What is the mole ratio between H₂O and HCI?

Farabellium (Fa) is an element that has not been discovered yet. There are 170.0 grams of Farabellium in one mole. If a chemist has 17.4 grams of FaBr2, how many moles is that? * 170.0 5738.5 0.0527 0.0696

a. When 83.87 and 90.754 are multiplied, the answer should have Enter the answer, using the correct number of significant figures: 83.87 x 90.754 = b. When 83.87 and 90.754 are summed, the answer should have Enter the answer, using the correct number of decimal places: 83 87 90 754 significant figure(s). digit(s) after the decimal point

Magical realism is a literary technique which presents magical events in an otherwise normal environment a literary technique which presents magical events in a magical environment a literary technique established in China in the 1600s a literary technique applied exclusively to nonfiction