10/31/20

Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq) , as described by the chemical equation MnO2(s)+4HCl(aq)⟶MnCl2(aq)+2H2O(l)+Cl2(g)
How much MnO2(s) should be added to excess HCl(aq) to obtain 285 mL Cl2(g) at 25 °C and 705 Torr?
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10/31/20

Convert torr to Pascals to help determine if the balloon will pop
At a party, one of the balloons containing 1,770 cm^3 of air at STP can withstand a pressure of 5.57x10^5 Pa. If Chris sits on the balloon and reduces its volume to 295 cm^3, what is the new... more
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10/31/20

Chemistry two- ld50
Ld50 and Ld100 of trazodone
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10/31/20

What is the pH of a solution of 0.400 M CH₃NH₂ containing 0.180 M CH₃NH₃I? (Kb of CH₃NH₂ is 4.4 × 10⁻⁴)
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10/31/20

Which element would have the lowest electron affinity?

Fluorine, Tellurium, Francium, Rhodium, Magnesium
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10/31/20

Finding pH of a buffer solution

Suppose you were asked to calculate the pH of a buffer solution containing 0.30 M acetate and 0.20 M acetic acid. If you were to find the pH using the ICE table, how do you know what equation to... more
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10/31/20

According to the periodic table, which of the following indicates the correct decreasing order of ionization energy?
Cs > Li > Na > K Li > Na > Cs > KLi > Na > K > CsLi > Cs > Na > K 
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10/31/20

According to the Periodic Table of the Elements, which set of elements has similar properties?
Si, Pt, WLi, F, ClHe, Ne, ArNa, Br, O
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10/30/20

AP Chemistry Gas Laws
 Gases N2 (g) and H2 (g) are added to a previously evacuated container and react at a constant temperature according to the following chemical equation: N2 (g)  + H2 (g) →  NH3 (g)     If the... more
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10/30/20

How many grams of water vapor can be produced if you begin with 86.02 g of C3H8 and 11.20 g of O2?
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10/30/20

least amount of heat
Which of the following would absorb the least amount of heat after a 50.0°C change in temperature? 20.0 g Pb, CPb = 0.13 J/g∙°C 20.0 g Ba, CBa = 0.20 J/g∙°C 20.0 g Zn, CZn = 0.39 J/g∙°C 20.0... more
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10/30/20

Suppose that Daniel has a 2.00L bottle that contains a mixture of O2,N2, and CO2 under a total pressure of 4.50atm.
He knows that the mixture contains 0.310 mol N2 and that the partial pressure ofCO2 is 0.250atm. If the temperature is 273 K, what is the partial pressure of O2?
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10/30/20

A 7.60 L container holds a mixture of two gases at 53 °C. The partial pressures of gas A and gas B, respectively, are 0.314 atm and 0.521 atm.

If 0.150 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?
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10/30/20

If a gaseous mixture is made by combining 3.82g Ar & 2.41g Kr in an evacuated 2.50L container at 25.0∘C
what’s the partial pressures of each gas,𝑃Ar and 𝑃Kr,and what is the total pressure,𝑃total,exerted by the gaseous mixture?
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10/30/20

A mixture of He, Ne, and Ar has a pressure of 26.4 atm at 28.0 °C. If the partial pressure of He is 4.88 atm and the partial pressure of Ar is 1.35 atm, what is the partial pressure of Ne?
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10/30/20

If 3.25 g Ar are added to 3.61 atm He in a 2.00 L cylinder at 27.0 °C, what is the total pressure of the resulting gaseous mixture?
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10/30/20

Finding Molar mass?
A sample of gas of mass 2.74   occupies a volume of 639 mL at 25  degrees celsius and   1.00 atm pressure. What is the molar mass of the gas?
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10/30/20

Please explain the steps of this problem and show the formula(s) used:
A 5.0 g piece of metal is heated to 100ºC, then placed in a beaker containing 20.0 g of water at 10ºC. The temperature of the water rises to 15ºC. Assuming that heat lost by the metal = heat gained... more
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10/30/20

Net ionic equation
Write a net ionic equation for the reaction that occurs when calcium sulfide and excess hydrochloric acid (aq) are combined.
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10/30/20

Chemistry Reactions
A. Consider the reaction when aqueous solutions of sodium hydroxide and iron(III) bromide are combined. The net ionic equation for this reaction is:B. Write a net ionic equation for the reaction... more
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10/30/20

Which of the following aqueous solutions has the highest boiling point at 1.0 atm? Why?
(A) 0.20 M CaCl2(B) 0.25 M Na2SO4(C) 0.30 M NaCl(D) 0.30 M KBr(E) 0.40 M C6H12O6
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10/30/20

A wave on a certain guitar string travels at a speed of 200m/s. Calculate the wavelength of an “A” note sounding at 440H
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10/29/20

Big Stoichiometry Chemistry HELPP PLSS!!
A. Balance the following equation.2 C6H14 + __ O2 → __ CO2 + __ H2O            b. What type of reaction is this? _________________________________ c. How many grams of H2O are made from 45.6 g of... more
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10/29/20

How do you name chemistry compounds and write formulas in chemistry, in general?

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10/29/20

please help me with this
If 64.1 g of sulfur dioxide react completely with 159.9 g of bromine and an unknown amount of water to form 161.9 g of hydrogen bromide and 98.1 g of sulfuric acid, then how many grams of water... more
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