25,963 Answered Questions for the topic chemistry

Chemistry

06/07/23

How to measure concentration of H2O2 in water mixture using density?

Explain using model plot.
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Chemistry

06/07/23

Calculate the equivalence ratio for the combustion reaction of n-decane and hydrogen peroxide using the stoichiometric equation. Show your calculations and explain the results.
Hint: Equivalence ratio, often denoted by the symbol φ (phi), is a term commonly used in the field of combustion to describe the relative amount of fuel and oxidizer present in a combustion... more
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Chemistry

06/07/23

Use the working principle of pressure cooker to explain safe liquid distillation for separating a liquid Y form the mixture of X, Y, Z .?

Note: When Y is exposed to temperature above 30 oC starts to decompose. Decomposition reaction @ 30 oC: Y -> aA +bBNote: Vapor pressure of X > Y > Z
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Chemistry

06/06/23

A student dissolves 125.0 g of lead(II) nitrate in enough water to make 250.0 mL of solution. What is the concentration of lead ions in solution in Eq/L?
Make sure you have accounted for the charge on a lead(II) ion.
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Chemistry

06/05/23

What is the concentration?
One type of insecticide decomposes according to second-order kinetics. The rate law of this decomposition is 1.45 yr-1. A sample of this insecticide washed into a lake on July 1st and produced an... more
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Chemistry

06/05/23

Chemistry question

If you started with exactly 2.000 g of salicylic acid and 5.00 mL of acetic anhydride, calculate the theoretical yield of aspirin, in grams. The density of acetic anhydride is 1.08 g/mL.If a team... more
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Chemistry

06/04/23

Chemistry question

Calculate the mass of acetic anhydride used (the density is 1.08 g/mL).I know I don’t have the information right in front of you, but what information would I need to find the mass of acetic... more
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Chemistry

06/02/23

Chemistry question

In which process is entropy decreased?(A)dissolving sugar in water(B)expanding a gas(C)evaporating a liquid(D) freezing watercould you explain which option is correct and why?
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Chemistry

06/02/23

Chemistry question

Which molecule has the greatest bond energy?(A) H-Br(B) H-F (C) H-At (D) H-CI(E) H-Icould you explain which option is correct and why?
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Chemistry

06/01/23

General Chemistry Question
The normal freezing point of benzene (C6H6) is 5.5 °C. If 29.53 grams of the nonvolatile nonelectrolyte 5-bromo-2-naphthoic acid (C11H7BrO2), are dissolved in 170.8 grams of benzene, what is the... more
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Chemistry

06/01/23

Chemistry question

An amino acid has a molar mass of 776.9 g mol and contains 65.34% iodine by mass. What is the number of iodine atoms per molecule of amino acid?(A) one(B) three (C) four(D)fivecould you explain... more
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Chemistry

06/01/23

Chemistry question

The atomic molar mass of a hypothetical element X is 100 u. It is found that the 50.0 g of X combines with 32.0 g of oxygen. What is the simplest formula for the oxide of X?Atomic Molar Mass of... more
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Chemistry

06/01/23

solve for x where M is molar and s is seconds

x=(5.9×103M−2s−1)(0.46M)3
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06/01/23

Need help with this
A container holds a mixture of 3.01 x 10^23 molecules of H22 gas, 1.20 x 10^24 molecules of CO22 gas, and 1.50 x 10^24 molecules O22. If the total pressure of the container is 1.00atm, what is the... more
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Chemistry

06/01/23

need help to see if my work it correct in sig fig to double check please and thank you

5. You will be given some samples to weigh on the electronic balance in the laboratory. Place a piece of weighing paper on the pan of the balance and push the zero (tare) button so the... more
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06/01/23

Which of these groups of elements would be expected to have similar chemical properties?

F, Cl, BrC, Ge, PbP, S, ArPt, Au, Hg
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06/01/23

Which of these groups of elements would be expected to have similar chemical properties?

F, Cl, BrC, Ge, PbP, S, ArPt, Au, Hg
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Chemistry Science

06/01/23

Chemistry Homework
Which of these electron configurations represents the ground state electron configuration of a d sublevel metal?1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f91s2 2s2 2p6 3s2 3p2 4s11s2 2s2... more
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Chemistry

06/01/23

If 7 Ms and 4 N are given you to create moles. How many are able to be created? What are the excess and limiting reactants?
Ms and N are fake elements in this scenario. It takes 2 Ms and 1 N to create a mole.
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Chemistry

06/01/23

If 100gof fabric and 200g of stuff are given to you to create moles. How many moles are you able to create? What is the excess and limiting reactants?
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Chemistry

05/31/23

Find concentration of calcium and magnesium ions

You the precipitated calcium and Mg2+ from Same mixture as their oxalate.Their remaining mass of the mixture in to analysis at 500°C was 5mg and at 900°C was 3.9mg. Calculate the masses of Mg2+ and... more
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Chemistry

05/30/23

Chemistry question
The compound more soluble in acidic solution than in just water.AgCIAgFAgBrAgOHcould you explain briefly which option is correct?
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Chemistry

05/30/23

Chemistry question

The transition metal with the lowest melting point.WOsPtAgcould you explain briefly which option you chose
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Chemistry

05/30/23

Chemistry questions

The transition metal with the highest density.WOsPtAgcould you explain briefly which option you chose?
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Chemistry

05/30/23

Chemistry, Acid Base Titration
What is the pH if you have 1.0M weak acid with pKa = 5.55?If you add 20.0mL of this weak acid with 20.0mL of 1.0MNaOH, a strong base, what would be the resulting pH?Please explain the steps thanks.
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