Organic Chemistry Questions

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. Therefore, how much oxygen was used in this reaction if the following data was collected? 2Mg + O₂--> 2MgO 2.50 g Mg 4.15 g MgO 2.50 g 6.65 g O5.80 g 1.65 g

One of the main assumptions of the kinetic molecular theory of gases is that the particles of an ideal gas-- are in constant motion must be highly chemically reactive must be maintained at very high pressures must be single atoms instead of molecules

V1/T1=V2/T2 P1V1= P2V2 PV=nRT You can apply any of the formulas above to solve the problem. A gas sample at 85°C occupies a volume of 14 L. At what temperature will it occupy 12 L? * 140°C 73°C 34°C 420°C

You invent a new unit system called the Blerg Unit System. The relationship between your unit system and other units are summarized below: 1 blah = 2.060 meters 1 blop = 3.05 pounds 1 kapow =11.8 liters You decide to convert all of your daily measurements to your new units. Assume you use 15.9 gallons of water when you shower. Convert this volume to kapows. [Hint: you may not need all of the above unit conversions.]

A sample of oxygen gas is collected over water at 22°C and 98.67 kPa pressure. If the partial pressure of the water is 2.67 kPa, the partial pressure of the oxygen is - 96.00 kPa 101.33 kPa 98.66 kPa 93.33 kPa

A block of tin metal has a volume of 4.88 L and a mass of 35.7 kg. Express your answer to three significant figures and include the appropriate units.

You can infer that, as the second march moved toward Montgomery. A. the marchers were attacked many times B. the marchers got caught in the rain C. thousands of people joined the crowd D. many marchers were arrested

2Na+2H₂-->2NaOH + H₂ How many moles of hydrogen gas are produced when 0.0132 moles of sodium is completely reacted? 0.0066 mol H₂ 0.0099 mol H₂ 0.0033 mol H₂ 0.0132 mol H₂

Industrial deep-sea divers must breathe a mixture of helium and oxygen to prevent a disorienting condition known as nitrogen narcosis. If a diver's tank is filled with a helium-oxygen mixture to a pressure of 170 atmospheres and the partial pressure of helium is 110 atmospheres, the partial pressure of the oxygen is - 280 atm 140 atm 110 atm 60 atm

To remove the sand first and then the salt from a mixture of sand and salt water, a combination of techniques you could use would be to- filter then evaporate filter then condense evaporate and then condense evaporate then distill

You find an unknown liquid and determine that it has a density of 4.9 g/mL. Assume you fill a 820.0 mL container with this substance and are wondering how heavy it will be. What is the mass (in kilograms) of the liquid in the container, assuming it is filled to exactly 820.0 mL?

According to Charles' law, the volume of a fixed amount of gas is directly proportional to- kelvin temperature isoelectric mixture barometric pressure vapor concentration

STP stands for standard temperature and pressure. Standard temperature is equal to 0 Kelvin 20.0°C O-273 °Celcius 273 Kelvin

Malonic acid is used in the manufacture of sleeping pills. A 5.500 g sample of malonic acid contains 1.904 g of carbon, 0.2131 g of hydrogen and the remainder is oxygen. Determine the empirical formula for malonic acid.

Calculate the number of moles of nitrogen in a steel tank with a volume of 9.583 L under a pressure of 4.972 atm and 31.8°C.

If the solubility of cholesterol in methanol were 1 g/100 mL at 20°C and 1 g/4.1 mL at 80°C, what is the maximum mass of cholesterol that could be recrystallized from 5.46 g cholesterol? Report the number of grams to two decimal places.

What is the molarity of a bleach solution that contains 5.0 g of NaCIO per 500.0 mL of bleach?

AlCl3 + AgNO3 →Al3NO3 +AgCl If 30.7 g of aluminum chloride is reacted with 90.5 g of silver nitrate, which reactant is limiting and which is excess? What mass of the excess reactant is used in the reaction, and what mass of the excess reactant remains after the reaction? What is the percent yield if the 65 g of silver chloride was produced in the lab.

Why does the pressure inside a container of gas increase if more gas is added to the container? There is an decrease in the temperature of the gas. There is an increase in the force of the collisions between the particles and the walls of the container. There is an increase in the volume of the container. There is an increase in the number of collisions between the particles and the walls of the container.

Scott is conducting a lab experiment when his lab partner's shirt catches on fire! Scott, knowing his safety procedures, quickly grabs the fire blanket and wraps his partner up in the blanket so that the fire goes out. What is the EXCESS reactant in this situation? oxygen the fire Scott's lab partner's shirt the blanket

What volume (in mL) of a 3.00 M iron (III) nitrate solution (Fe(NO3)3) would contain 1.75 moles of the compound? 5250 mL 583 mL 1710 mL 5.25 mL

A measure of the amount of a substance dissolved in a specific amount of solution is called the____of the solution. temperature dilution molar volume concentration

What is the molarity of a solution in which 45 g of aluminum bromide (AlBr3) is dissolved in 150 mL of water? 0.0011 M 3.33 M 1.12 M 0.30 M

A sample of three mixed gases is at 632.0 mmHg: CO2, N₂ and O2. The partial pressure of the N₂ is 75% of the total pressure. What is the partial pressure of the N₂? 557 mmHg 600 mmHg 474 mmHg 158 mmHg

A sample of helium has a volume of 45 mL at 20.0°C and 203.0 kPa. If the pressure is constant, what is the volume of the sample at 10.0°C? 900 mL 47.5 mL 43.5 mL 22.5 mL

Balance the following neutralization reactions and use it to solve the next 3 problems below. ingrese su respuesta... AI(OH)3 + ingrese su respuesta... H₂O ingrese su respuesta... H₂SO4 --> ingrese su respuesta... Al₂(SO4)3 +

Kira dissolved different solutes in 100 mL of water. She recorded the amount of each solute that would dissolve at different temperatures. What information will this investigation confirm? The effect of the solvent on the temperature of the solution. The effect of temperature on the amount of solute dissolved. The temperature of the solution is dependent on the kind of solute used. The temperature of the solution is dependent on the amount of solute.

Experiment 14 Spectrophotometric Determination of an equilibrium constant, K₁. Based on the known concentration and absorption values the the Trendline from Beer-Lambert Law plot was, y = = 6455.4x -0.0175. Please answer the following questions. (a) for part i and ii please copy past from the following choices (Absorption, %T, Concertation of the complex ion) i. the y axis represents = ii. the x axis represents

What is the molarity of an calcium chlorate (Ca(CIO3)2) solution that has 0.17 moles dissolved in 875 mL? 1.2 M 0.194 M 1.94 x 10-4 M 1.33

When a substance dissolves in a solvent it forms a compound suspension solution element

Which of the following is true of a solution compared to the pure solvent? Solutions cannot exist in three phases but the pure solvent can. Solutions have a lower freezing point. Solutions have a higher vapor pressure, which means that evaporate more easily that the pure solvent. Solutions have a lower boiling point.

Soda water is a solution of carbon dioxide in water. The solution is composed of a liquid solute in a gaseous solvent gaseous solute in gaseous solvent gaseous solute in liquid solvent liquid solute in a liquid solvent

Sucrose (sugar) molecules dissolve easily in water because both sucrose molecules and water molecules are___molecules. covalent nonpolar polar tetrahedron

When a concentrated solution is diluted by the addition of more solvent, which of the following does NOT change? moles of dissolved substance mass of the solution volume of the solution molarity of the solution

If you wanted to add 162 g of sodium carbonate (Na2CO3) to a prepare a 2.20 M solution, what volume, in liters, would you need?

Molly is trying to increase the boiling point of a solution of solid NaOH in water. Which of the following would help? heating the solution decreasing the pressure adding more NaOH adding more water

6.00 M HCI was diluted to a 1.32 M solution. If there was 125 mL of the concentrated solution, what volume (in mL) of the dilute solution was made?

. At STP, which of the following would have the same number of molecules at 1 L of C₂H4 gas? Assume that each behaves as an ideal gas. 1 L of Ne gas 2 L of H₂O gas 0.5 L of H₂ gas 3 L of Cl₂ gas

You and your friends decide to have a big party in your chemistry lab to celebrate the end of the schoo year. For fun, you decide to use beakers instead of cups for the drinks at the party. However, not all o the chemicals from your last experiment were properly put away and a beaker of hydrochloric acid (HCI) was lying around. Your classmate at the party accidentally drinks the whole glass of hydrochloric acid and is now choking. Nevertheless, being the amazing chemist that you are, you know that if you give your classmate baking soda, which is sodium bicarbonate (NaHCO3,a base), you can neutralize the acid and save your friends life. So, if your friend drank 50g of hydrochloric acid, how many grams of baking soda do you need to completely neutralize the acid and save your friend? NaHCO3 + HCI → H₂O + CO₂ + NaCl

1). Without doing any calculations, determine whether the standard entropy change, AS is positive or negative for each of the following reactions. reaction 1: S(s, rhombic) + O2(g) → SO2(g) reaction 2: 2 SO₂(g)+ O₂(g) → 2 SO3(g) A) AS is positive for both reactions. B) AS is positive for reaction 1 but negative for reaction 2. C) AS is positive for reaction 2 but negative for reaction 1. D) AS is positive for both reactions.

What mass of silver acetate (AgC₂H3O2) do you need to make 2.70 L of a 3.50 M solution? 167 g 1577 g 584 g 451 g

An ice skating rink has tubes under its floor to freeze the water. Salt water is cooled well below the freezing point of water and pumped through the tubes to freeze the water in the rink. Why can the salt water be cooled so low without freezing? Salt has a very low freezing point. Adding salt to the water lowers its freezing point Movement of the water through the tubes keeps it in the liquid state. The salt water is constantly absorbing energy from its surroundings.

Upload a picture of your work and your answer. Round to the hundredths place, and use units. * H₂S + 2KOH → 2H₂O + K₂S Part 1: 42g of H₂S and 61g of KOH start a reaction. What is the limiting reagent?

What is the molarity of an aluminum acetate (Al(C₂H3O2)3) solution that has 0.333 moles dissolved in 0.250 liters? 0.00774 M 1.2 M 0.75 M 1.33 M

A 0.95 L of a barium bromide solution (BaBr₂) contains 0.55 moles of the solute. What is the molarity of the solution? 1.95 x 10-³ M 1.33 M 1.73 M 0.58 M

Sodium reacts violently with water in the forward direction according to the equation: 2 Na(s) + 2 H₂O(1) → 2 NaOH(aq) + H₂(g) What are the signs of ΔH and ΔS for this reaction? A) ΔH is negative and ΔS is negative. B) ΔH is negative and ΔS is positive. C) ΔH is positive and ΔS is negative. D) ΔH is positive and ΔS is positive. E) ΔH is positive or negative and ΔS is negative F) ΔH is positive or negative and ΔS is positive.

A reaction has AH-60.9 kJ/mol and AS-266.6 J/K. Is this reaction spontaneous or nonspontaneous? At what temperature (if any) can the spontaneity be reversed? A) nonspontaneous, can be made spontaneous at 228 K B) nonspontaneous, cannot be made spontaneous at any temperature C) spontaneous, can be made nonspontaneous at 228 K D) spontaneous, cannot be made nonspontaneous at any temperature

What is the pH of a substance with a hydrogen concentration of 1.0 x 10^-11? Your Answer:. Answer

According to the following balanced equation, approximately how many moles of hydrochloric acid (HCI) would be necessary to produce 18 grams of water? 16 HCI + 2 KMnO4 --> 2 KCI + 2 MnCl₂ + 5 Cl2 + 8 H₂O

A balloon has a volume of 2.5 liters while under 101.3 kPa at a temperature of 15 °C. If the balloon is released and rises to a height where the pressure drops to 75 kPa and the temperature drops to -5 °C, what will its new volume be?