25,963 Answered Questions for the topic chemistry

12/16/23

How many chloramphenicol capsules, each containing 250 mg of chloramphenicol are needed to provide 50 mg/kg body weight per day for 1 week for a person weighing 150 lbs.
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Chemistry

12/14/23

Which sample contains the greatest number of atoms. A sample of P that contains 2.82×1024 atoms or a 5.64 mole sample of Si?
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Chemistry

12/13/23

Collision Theory & Reaction Rates│Please Help!
Why does increasing the concentrations of the two aqueous solutions of a double replacement reaction increase the rate of reaction? Higher concentrations will increase the temperature of the... more
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Chemistry

12/13/23

Collision Theory & Reaction Rates│Please Help!
When solid sodium bicarbonate reacts with aqueous hydrogen monochlroride (hydrochloric acid) it forms carbon dioxide gas, water, and sodium chloride.Which of the following would increase the rate... more
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Chemistry

12/13/23

Collision Theory & Reaction Rates│Please Help!
For a reaction in which the reactants are gases, which of the following would increase the rate of chemical reaction? (Select all Correct Answers) Decreasing the volume of the reactor Increasing... more
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Chemistry Science

12/12/23

Moles, Molar Mass, and Molarity│Please Help!
What is the molarity of a solution that contains 50.0g of NaOH (molar mass = 40 grams/mole) in 2.0L of solution? 25M 2.5M 1.3M 0.63M
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Chemistry Science

12/12/23

Moles, Molar Mass, and Molarity│Please Help!
What is the molarity of a 0.500L solution that contains 2.0 moles of NaCl? 4.0M 250M 1.0M 2.0M
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Chemistry

12/12/23

An acid-base reaction is shown below. What is the value of Krxn?
An acid-base reaction is shown below. What is the value of Krxn?OH1- (aq) + HF(aq) --> F1- (aq) + H2O(l)A) 2.1 x 10-4 B) 1.0 x 107 C) 7.2 x 1010 D) 7.2 x 10-4 E) 2.5 x 10-11B is the correct... more
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Chemistry

12/12/23

Chemistry mol/L

A chemist prepares a solution of mercury(II) iodide HgI2 by measuring out 4.02mg of mercury(II) iodide into a 250. mL volumetric flask and filling the flask to the mark with water. Calculate the... more
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Chemistry

12/11/23

Chemistry problem g/L

What is the answer to this problem? One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(II) carbonate, in concentrated sulfuric acid.... more
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Chemistry

12/11/23

Chemistry Mol/L
What is the answer to this question? "A chemist prepares a solution of mercury(II) iodide HgI2 by measuring out 4.02mg of mercury(II) iodide into a 250. mL volumetric flask and filling the flask to... more
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Chemistry

12/11/23

Chemistry Moles
What would the answer be to this question? "A chemist adds 0.25L of a 0.949M sodium carbonate Na2CO3 solution to a reaction flask. Calculate the moles of sodium carbonate the chemist has added to... more
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Chemistry

12/11/23

Chemistry (moles)
What would the answer be to this question? "A chemist adds 0.25L of a 0.949M sodium carbonate Na2CO3 solution to a reaction flask. Calculate the moles of sodium carbonate the chemist has added to... more
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Chemistry

12/11/23

4.10 L of a 6.00 M NaOH solution

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Chemistry

12/10/23

What quantity of hydrogen gas is formed when 0.85 g of lithium reacts with water according to the following balanced equation? 2Li + 2H2O → 2LiOH + H2
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Chemistry

12/10/23

What mass of sodium oxide is produced by the reaction of 1.44 g of sodium metal with oxygen according to the following unbalanced reaction?Na + O2 → Na2O
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Chemistry

12/08/23

Determine the pH of a 0.741 M KOH solution at 25°C.
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Chemistry

12/07/23

K3CeCN6 what is the oxidation state of Cr

K3CeCN6what is the oxidation state of Crwhat's the electron configurationthe complex ion has numerous linkage isomers, draw 2 examplesthe complex ion is a low spin, how would i draw the orbital... more
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Chemistry

12/07/23

For the balanced equation: N2 + 3H2 = 2NH3. What is the mass of the excess reagent when 84.06g of N2 and 22.18g of H2 are combined

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Chemistry

12/06/23

Calculate the amount of americium-241 consumed in a smoke detector (initially containing 6.6000 µg of Am), in micrograms
Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a smoke detector (initially containing 6.6000 µg of Am), in micrograms, that has been used for... more
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Chemistry

12/06/23

Le Chatelier's Principle│Please Help!
Indicate which conditions would keep the soda fizzy (more H2CO3) by selecting the correct change in the stressor from the drop down menu.Pressure: Increase / DecreaseVolume: Increase /... more
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Chemistry

12/06/23

Molar Enthalpy of Fusion

At standard conditions (1 bar), the melting point of ethanol is at -114.1 C. When a pressure of 3700 bar is applied to solid ethanol, its melting temperature rises to -92.2 C. Determine the molar... more
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Chemistry

12/06/23

Calculate equilibrium constant at 25C And 45C
I’m given the equilibrium concentration of of chemical reaction at 25C [SO2]= 0.1 M, [O2] = 0.3 M and [SO3] = 0.5 M2 SO2 (g) + O2 (g) <——> 2 SO3 (g). I’m asking to find the equilibrium... more
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Chemistry

12/06/23

How much energy (in kJ) is absorbed/released to cool the gas?
A 130.2 gram sample of an unknown substance (MM = 189.50 g/mol) is cooled from 233.0 °C to 147.6 °C. (heat capacity of liquid = 1.62 J/g･ °C; heat capacity of gas = 1.04 J/g･ °C; ∆Hvap = 78.11... more
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Chemistry

12/05/23

What are the basic assumptions of the kinetic-molecular theory?
Check all that apply.Gas pressure is a measure of the number and forcefulness of collisions between gas particles and the walls of their container.The average kinetic energy of the gas particles is... more
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