Ishwar S.

You have 330ul of stock at a concentration of 10mg/ul. How do you make 500ml of 10ng/ml out of the stock solution? My answer is 5x10 to power of -8ml added to the needed amount of ml of water. Is... more

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Chemistry

10/30/18

Use Lewis theory to determine the chemical formula for the compound formed between Rb and O.

Rb3O2RbO2RbORb2ORb2O3I have narrowed it down to Rb2O3, it has an even number of Valence Electrons at 20, but drawing the Lewis structure is where I am slightly uncertain and struggling. Rb2O has... more

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Ap Chemistry

10/29/18

Ionization energy

Arrange the following species in order of decreasing first ionization energy:ArCaXeNe

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Chemistry

10/25/18

calculate ph of solution containing 0.15 M weak acid HA and 0.2 M sodium salt NaA pKa HA = 4.66

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Answers •1

Chemistry

10/24/18

The equilibrium concentrations of A and B for the reaction below are 0.0725 M and 0.0741 M

The equilibrium concentrations of A and B for the reaction below are 0.0725 M and 0.0741 M, respectively. If the equilibrium constant is Kc=17.4223, what is the equilibrium concentration... more

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Chemistry

10/22/18

Calculate the pH after 12.50 mL of 0.100 M NaOH has been added to 25.0 mL

Calculate the pH after 12.50 mL of 0.100 M NaOH has been added to 25.0 mL of 0.100 M CH3CO2H. The Ka of CH3CO2H is 1.8×10−5.

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Chemistry

10/22/18

chemistry problem

the reaction of barium nitrate (Ba(NO3)2) with sodium sulfate (Na2SO4). Assume that 0.45 mol of Ba(NO3)2 reacted with excess Na2SO4 to produce 0.41 mol of BaSO4. Ba(NO3)2 + Na2SO4 —> BaSO4 +... more

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Chemistry 1

10/22/18

Calculate the number of moles of H2SO4 in 4.5 x 10^13 molecules of H2SO4

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Organic Chemistry

10/21/18

Describe in words and drawings what happens to the energy of all molecules in a reaction when the temperature is increased from 100 degrees to 200 degrees.

Make sure you include how this effects the kinetics of the reaction.

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Organic Chemistry

10/21/18

In a reaction that proceeds by an E2 mechanism, what effect does changing the substrate from an alkyl iodide to an alkyl bromide have on the rate of the reaction?

Answer Choices:A. Increases the rateB. Decreases the rateC. No effect on the rate

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Chemistry

10/19/18

A 14.15 g sample of NaBr contains 22.34% Na by mass. Considering the law of constant composition (definite proportions) how many grams of sodium does a 7.01 g sample of sodium bromide contain?

I really do not understand how to solve it.

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Chemistry

10/19/18

Number of formula units in a 1.72 mole sample of CaO

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Chemistry

10/15/18

nuclear symbols

Give the nuclear symbol (isotope symbol) for the isotope of bromine, Br, that contains 46 neutrons per atom.Replace the question marks with the proper integers. If necessary, use the button that... more

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Math Chemistry

10/15/18

Converting kilometers to miles

While driving your rental car on your trip to Europe, you find that you are getting 13.3 kilometers per liter of gasoline. What does this correspond to in miles per gallon?

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Math

10/15/18

If the area of a rectangle is 192 inches squared, what is the parimeter? The legnth is 3.

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Chemistry Ap Chemistry

10/14/18

coffee cup calorimetry

1) In this virtual lab, you will use coffee cup calorimetry to determine the specific heat, c, of a metal. Imagine that, in lab, you record the mass of a piece of metal, mmetal, as m(metal) =45.00... more

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Chemistry Acids And Bases Weak Base

10/13/18

Weak base in water, (Salt in Water) ?

What is the pH of a lithium cyanide solution prepared by dissolving 10.00gram of LiCN in water up to 500. mL? Hydrocyanic acid has a Ka-4.9x10^-10.> So far I get molarity of 0.607M but I am not... more

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Chemistry Solution Stochiometry

10/13/18

Making A Solution

Make a 50.0 ml of a solution that is 0.080 M sulfuric acid and also 0.20 M in KIO3. Calculate how many milliliters of 0.080 M sulfuric acid are needed to make 50.0 ml of 0.080 M sulfuric acid.... more

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Chemistry Solutions Stochiometry

10/13/18

Making a Solution

Make 50.0ml of a solution that is both 0.15 M in malonic acid, CH2(CO2H)2 and 0.020 M MnSO4. Tip: Simply Calculate how grams of malonic acid to make 50.0 ml of 0.15 M malonic acid and how many... more

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General Chem

10/13/18

atm,temp,volume

A balloon with a volume of 5.58 L is at a pressure of 0.86 atm and a temperature of 12oC. If the pressure is increased to 4.2 atm and the temperature is raised to 48oC, what is the new volume of... more

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Chemistry

10/12/18

calculate the density of O2 at STP ( 1 atm , 0 degrees celcius and at 25 degrees celsius and 760 mmhg

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Chemistry Ap Chemistry

10/12/18

ΔHrxn reactions

Given these reactions,X(s) +1/2 O2(g) --> XO(s)ΔH=-539.5 kJXCO3(s) --> XO(s)+CO2(g)ΔH=+266.3 kJwhat is ΔHrxn for this reaction?X(s)+1/2 O2(g)+CO2(g) --> XCO3(s)

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The length of a box is 3 cm less than twice its width. Which of the following gives the length

A tennis racket normally costs $90. The tennis racket is on sale for 70% off. What is the sale price of the tennis racket?

What is the formula for diphosphorus pentachloride?

concentration solution

Use Lewis theory to determine the chemical formula for the compound formed between Rb and O.

Ionization energy

calculate ph of solution containing 0.15 M weak acid HA and 0.2 M sodium salt NaA pKa HA = 4.66

The equilibrium concentrations of A and B for the reaction below are 0.0725 M and 0.0741 M

Calculate the pH after 12.50 mL of 0.100 M NaOH has been added to 25.0 mL

chemistry problem

Calculate the number of moles of H2SO4 in 4.5 x 10^13 molecules of H2SO4

Describe in words and drawings what happens to the energy of all molecules in a reaction when the temperature is increased from 100 degrees to 200 degrees.

In a reaction that proceeds by an E2 mechanism, what effect does changing the substrate from an alkyl iodide to an alkyl bromide have on the rate of the reaction?

A 14.15 g sample of NaBr contains 22.34% Na by mass. Considering the law of constant composition (definite proportions) how many grams of sodium does a 7.01 g sample of sodium bromide contain?

Number of formula units in a 1.72 mole sample of CaO

nuclear symbols

Converting kilometers to miles

If the area of a rectangle is 192 inches squared, what is the parimeter? The legnth is 3.

coffee cup calorimetry

Weak base in water, (Salt in Water) ?

Making A Solution

Making a Solution

atm,temp,volume

calculate the density of O2 at STP ( 1 atm , 0 degrees celcius and at 25 degrees celsius and 760 mmhg

ΔHrxn reactions

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Emmersion

The length of a box is 3 cm less than twice its width. Which of the following gives the length

A tennis racket normally costs ​$90. The tennis racket is on sale for 70​% off. What is the sale price of the tennis​ racket?

What is the formula for diphosphorus pentachloride?

concentration solution

Use Lewis theory to determine the chemical formula for the compound formed between Rb and O.

Ionization energy

calculate ph of solution containing 0.15 M weak acid HA and 0.2 M sodium salt NaA pKa HA = 4.66

The equilibrium concentrations of A and B for the reaction below are 0.0725 M and 0.0741 M

Calculate the pH after 12.50 mL of 0.100 M NaOH has been added to 25.0 mL

chemistry problem

Calculate the number of moles of H2SO4 in 4.5 x 10^13 molecules of H2SO4

Describe in words and drawings what happens to the energy of all molecules in a reaction when the temperature is increased from 100 degrees to 200 degrees.

In a reaction that proceeds by an E2 mechanism, what effect does changing the substrate from an alkyl iodide to an alkyl bromide have on the rate of the reaction?

A 14.15 g sample of NaBr contains 22.34% Na by mass. Considering the law of constant composition (definite proportions) how many grams of sodium does a 7.01 g sample of sodium bromide contain?

Number of formula units in a 1.72 mole sample of CaO

nuclear symbols

Converting kilometers to miles

If the area of a rectangle is 192 inches squared, what is the parimeter? The legnth is 3.

coffee cup calorimetry

Weak base in water, (Salt in Water) ?

Making A Solution

Making a Solution

atm,temp,volume

calculate the density of O2 at STP ( 1 atm , 0 degrees celcius and at 25 degrees celsius and 760 mmhg

ΔHrxn reactions

Still looking for help? Get the right answer, fast.

OR

Ishwar S.

A tennis racket normally costs $90. The tennis racket is on sale for 70% off. What is the sale price of the tennis racket?