11/09/21

Heat Transfer/ Specific Heat Problems. Steps on how to do it please.

The specific heat of iron is 0.4494 J/g x oC. How much heat is transferred when a 4.7 kg piece of iron is cooled from 180 oC to 13 oC? Remember you must use the same units so you will have to... more
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11/09/21

Heat Transfer/Specific Heat Problems. Step-by-step
How much heat is lost when a 64 g piece of copper cools from 375 oC, to 26 oC? (The specific heat of copper is 0.38452 J/g x oC). Place your answer in k
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11/09/21

Heat Transfer/Specific Heat Problems. Step-by-step
How many joules of heat are required to raise the temperature of 550 g of water from 12.0 oC to 18.0 oC?
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11/08/21

The compound potassium hydroxide is a strong electrolyte. Write the transformation that occurs when solid potassium hydroxide dissolves in water: Be sure to specify states such as (aq) or (s).
The compound potassium hydroxide is a strong electrolyte. Write the transformation that occurs when solid potassium hydroxide dissolves in water:Be sure to specify states such as (aq) or (s).
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11/08/21

net ionic equation
Write a net ionic equation for the reaction that occurs when solid chromium(II) carbonate is combined with excess aqueous hydroiodic acid .Be sure to specify states such as (aq) or (s). If a box is... more
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11/08/21

Enough of a monoprotic acid is dissolved in water to produce a 1.23 M solution. The pH of the resulting solution is 2.65 . Calculate the Ka for the acid.
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11/08/21

The 𝐾a of a monoprotic weak acid is 0.00623. What is the percent ionization of a 0.131 M solution of this acid?
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11/08/21

compound consists of 85.6% carbon and 14.4% hydrogen. The molar mass of the compound is 84.2 g/mol. Find the empirical and molecular formulas of the compound
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11/08/21

A balloon contains 8.4 L of helium gas at STP. How many moles of helium are in the balloon? 0.38 moles He ,190 moles He ,2.1 moles He ,8.4 moles He
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11/08/21

chemistry question
A dibase acid, H2J has the concentration of 0.5 mol dm-3. Letter J is not the actual symbol of the element.What is the volume of potassium hydroxide, KOH, 1.0mol dm-3 that can neutralize 25.0 cm3... more
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11/08/21

Chemistry Homework
Classify each of the following compounds as a strong electrolyte, weak electrolyte, nonelectrolyte, acid, or base:Potassium sulfate
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11/08/21

dilution chemistry
A chemist must dilute 69.8mL of 142. mM aqueous barium chlorate Ba(ClO3)2 solution until the concentration falls to 53.0 mM . He'll do this by adding distilled water to the solution until it... more
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11/08/21

What is the molar solubility of AgCl (Ksp = 1.80 × 10⁻¹⁰) in 0.940 M NH₃? (Kf of Ag(NH₃)₂⁺ is 1.7 × 10⁷)
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11/07/21

Science homework Im not sure how to answer this 3 part question

(2.5 points) 1. (a) When a metal was exposed to light at a frequency of 5.74 x 1015 s-1, electrons were emitted with a kinetic energy of 6.97 x 10-19 J. Determine the work function, in kJ/mol.(1.5... more
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11/07/21

A 16.0 L helium tank is pressurized to 25.0 atm.

A  16.0 L helium tank is pressurized to 25.0 atm. When connected to this tank, a balloon will inflate because the pressure inside the tank is greater than the atmospheric pressure pushing on the... more
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11/07/21

nuclear chemistry

It takes 4 h 39 min for a 2.00-mg sample of radium-230 to decay to 0.25 mg. What is the half-life of radium-230?
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11/07/21

Identify the name and magnetic quantum numbers for each subshell with the following quantum numbers: n= 3, l=2 n=1, l=0 n=2, l=1
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11/07/21

Chemistry in uni
Hey!0,100 L of 0,100 M NaCl (aq) is mixed with 0,500 L of 0,200 M NaF (aq). What is the concentration (molar) of Na+ in the mixture?Thanks for helping me out :)
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11/07/21

The activation energy, Ea, for a particular reaction is 19.4 kJ/mol. If the rate constant at 80 °C is 0.820 M⁻¹s⁻¹, then what is the value of the rate constant at 247 °C? (R = 8.314 J/mol • K)
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11/07/21

The activation energy Ea for a particular reaction is 42.2 kJ/mol. How much faster is the reaction at 343 K than at 316 K? (R = 8.314 J/mol • K)
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11/07/21

What is the concentration of A after 17.7 minutes for the reaction A → Products when the initial concentration of A is 0.750 M? (k = 0.0451 M⁻¹min⁻¹)
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11/07/21

How long will it take for the concentration of A to decrease from 1.25 M to 0.287 for the second order reaction A → Products? (k = 1.52 M⁻¹min⁻¹)
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11/07/21

The half-life for the zero order reaction A → Products is 276 s. What is the value of the rate constant for the reaction if the initial concentration of A is 0.697?
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11/07/21

Chemistry in uni
Hey!Which one of these salts will have the highest pH (they have same concentration) NaNO2 KCl NaClO4 NaBr
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11/07/21

You need a 50% alcohol solution. On hand, you have a 195 mL of a 10% alcohol mixture. You also have 65% alcohol mixture.

How much of the 65% mixture will you need to add to obtain the desired solution?
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