05/08/21

Use the data below for the burning of Hot Cheetos:
mass of water: 100.0 gmass of Hot Cheetos (before burning): 85.0 gmass of Hot Cheetos (after burning): 80.0 ginitial temperature of water: 15.0oCfinal temperature of water: 30.0oCwhat is the food... more
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05/08/21

Show all work for calculations
2 AB (g) + B2 (g) → 2AB2 (g); H° = +492.0 kJ/mol, S° = +236.9 J/KmolThe molar mass for AB for part (a) is 149.88Answer the following questions regarding the reaction represented above.(a) Calculate... more
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05/07/21

please help me with chemistry

The sign for ΔH of the SURROUNDINGS if an endothermic reaction is taking place isA. surroundings is (-)ΔHB. surroundings is (0)ΔH    C. surroundings is (=)ΔHD. surroundings is (+)ΔH
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05/07/21

please help me with chemistry

Calculate the heat produced when 0.170 moles of boric acid, H3BO3 is produced.B2H6 (g) + 6H2O(l) → 2H3BO3(s) + 6H2(g) + 184 kJ
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05/05/21

A sample of helium gas in a balloon is compressed from 4550 mL to 2.50 L at a constant temperature
A sample of helium gas in a balloon is compressed from 4550 mL to 2.50 L at a constant temperature. If the pressure of the gas in the 4550 mL volume is 210.0 kPa, what will the pressure be at 2.50... more
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05/05/21

Which assumption is part of the kinetic molecular theory?
Which assumption is part of the kinetic molecular theory?the particles in a gas can be compressedthe particles in a gas collide and emit energy to the surroundingsthe particles in a gas have a... more
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05/04/21

1 An anesthesiologist is about to administer gas to a patient. The gas has a temperature of 22.4ºC.

When the gas enters the patient’s body, it is warmed to a temperature of 37.2ºC and expands to a volume of 1.050 L. Determine the original volume (assuming pressure is constant). A. 9.50 LB. 1.00... more
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05/04/21

What volume (L) of NH3 gas at STP is produced by the complete reaction of 7.5 g of H2O acording to the following reaction. MgN2(s) + 6H2O(l) → 3Mg(OH)2(aq) + 2NH3(g)
A. 19B. 28C. 3.1D. 9.3
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05/04/21

2.00 moles of a gas are contained in a 2.00 liter vessel at a temperature of 300. degrees Celsius at a pressure of 10.00 atm.
The gas is allowed to expand to a new volume of 8.00 liters, but at the same time maintaining the original temperature. What is the new pressure? A. 1.25 atmB. 7.50 atmC. 5.00 atmD. 2.50 atmE.... more
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05/04/21

The temperature of a fixed mass of gas in a rigid container is decreased from 127.00 oC to 27.0 oC. The initial pressure was 1000. mmHg. Which is closest to the new pressure, in mmHg, after cooling?

A. 200 B.750 C. 900 D. 500 E.1330
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05/04/21

A rigid metal tank contains helium gas. Which applies to the gas in the tank when some helium is removed at constant temperature?
the average distance between the gas molecules decreasesthe average speed of the gas molecules decreasesthe pressure of the gas decreasesthe total number of gas molecules remains the samethe volume... more
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05/04/21

What volume of O2(g) is required to react with excess CS2(l) to produce 10.0 L of CO2(g)? (Assume all gases are measured at 0°C and 1atm.)
CS2(l) + 3O2(g) → CO2(g) + 2SO2(g)Show all calculations and put your answer in correct sig figs.
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05/04/21

According to Avogadro’s law, 1 L of H2(g) and 1 L of O2(g) at the same temperature and pressure

have the same molar masshave the same masscontain equal numbers of moleculescontain 1 mol of gas each
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04/28/21

Chapter 9 Test Review
What d-block elements are exceptions to the configuration rules? Write the electron configuration for those elements.
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04/28/21

What volume (in mL) of 0.150 M HCl would be required to completely react with 5.45 g of Al in the following chemical reaction?
2 Al(s) + 6 HCl(aq) → 2 AlCl₃ (aq) + 3 H₂(g)
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04/28/21

What is the pressure of the "dry" Hydrogen gas using Daltons law of partial pressures.
Trial 1Mass of Mg:0.073gVolume of Hydrogen gas in cylinder: 63.2mLTemperature of hydrogen gas: 295KBarometric pressure is 761 torrVapor pressure of water: 19.7 mm HgWhat is the pressure of the... more
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04/28/21

Naming Acids Bases practice
Name the following... more
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04/28/21

Pressure Temperature Conversions Practice
ASSIGNMENT: Practice problems! (show your work)Convert these to atmospheres: 340 kPa540 mm Hg Convert these to mm Hg: 1.7 atm28.59 kPa Convert these to kPa:0.8 atm810 mm HgConvert degrees C to... more
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04/28/21

Dalton's and Boyle's Law practice
A metal tank contains three gases: oxygen, helium, and nitrogen. If the partial pressures of the three gases in the tank are 35 atm of O2, 5 atm of N2, and 25 atm of He, what is the total pressure... more
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04/28/21

Charles's and Gay-Lussac's Law practice
1. A container holds 30.0 mL of nitrogen at 45° C. What will be its volume if the temperature increases to 65° C? 2. A sample of oxygen occupies a volume of 12 L at 1000° C. What will be the... more
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04/28/21

Combined Gas Law Practice
2) I have an unknown volume of gas at a pressure of 0.80 atm and a temperature of 328 K. If I raise the pressure to 1.5 atm, decrease the temperature to 323 K, and measure the final volume to be 50... more
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04/23/21

Urgent Please help with chemistry question

The acidic form of the dye litmus, HLit, is red; the basic form, Lit-, is blue. As a result, litmus is red in acetic acid, HAc, and blue in ammonia, NH3.a) Write the B-L equations for the reaction... more
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04/23/21

Suppose a piece of iron with mass of 21.5 g at temp of 100.0 °C is dropped into an insulated container of water. The mass of the water is 132.0 g and its temperature before adding the iron is 20.0°C.

What will be the final temp of the system? Specific heat of iron is 0.46 J/goC.
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04/23/21

A student heats a piece of 130g of an unknown grayish metal to a temperature of 99.2 °C. She places the metal in a Styrofoam cup that contains 55.7 g water at a temperature of 23.0°C.

The hot metal heats the water in the cup to 31.4°C. What is the specific heat of the metal? 
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04/23/21

A piece of copper alloy with a mass of 85.0 grams is heated from 30°C to 45°C. In the process, it absorbs 523 J of energy as heat. What is the specific heat of this alloy?

A piece of copper alloy with a mass of 85.0 grams is heated from 30°C to 45°C. In the process, it absorbs 523 J of energy as heat. What is the specific heat of this alloy? Show all your work and... more
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