01/22/23

What distance does electromagnetic radiation travel in 7.50 msec?
What distance does electromagnetic radiation travel in 7.50 msec?I got 2250000m, but apparently, I'm wrong. Please help.
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01/07/23

Analytical Chemistry
A 100.0 mL sample of drinking water was treated with ammonia buffer and after the addition of the Eriochrome Black T indicator, required 18.0 mL of 0.00559 M EDTA for titration. (a) Identify the... more
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11/27/22

Potassium-40 decays to argon-40 with a half-life of 1.27 x 10^9 years. What is the age of a rock where the number ratio of potassium-40/argon-40 is 1.72?
Potassium-40 decays to argon-40 with a half-life of 1.27 x 109 years. The resulting argon remains trapped in the rock for most minerals. What is the age of a rock where the number ratio of... more
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07/30/22

A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution after the addition of 150.0 mL of HNO3. The Kb of NH3 is 1.8 × 10-5.
I've been working on this for a while but can't seem to figure out what I am doing wrong, so far, here are my steps below:moles of NH3: 0.100L * 0.10M = 0.01 molesmoles of HNO3: 0.150L * 0.10M =... more
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07/14/22

Chemistry 102: Acid Equilibrium: Find net equation for pt 1 & 2
7.When a strong base is added to a solution of CuSO4, which is pale blue, a precipitate forms and the solution above the precipitate is colorless.part 1). Include phases in the balanced chemical... more
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10/24/20

Dilution: Moles to Volume
You wish to make a 0.240 M hydrochloric acid solution from a stock solution of 12.0 M hydrochloric acid. How much concentrated acid must you add to obtain a total volume of 175 mL of the dilute... more
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10/17/20

How many moles of gas are in a volume of 43.5 L at STP? Please show work
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07/21/20

how many faradays are needed to convert 1 mole of the following to the indicated product?
(a) Fe3+ to fe2+(b) NH3 to NO3-(c) Cl2 to 2 ClO3-(d) MnO4- to Mn2+(e) Pb to PbO2
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06/12/20

How to complete the reactions?
262888Ra -> __ + 0-1e + v230868Rn -> 21684Po+___Ccomplete the following reactionState what type of nuclear decay it isExplain why is it that type of reaction
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06/09/20

After 71.0 min, 35.0% of a compound has decomposed. What is the half‑life of this reaction assuming first‑order kinetics?
Please help me with this question!Thank you!
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06/09/20

Someone help me please
If you were performing this lab, is it better to add a large volume of base to the receiving flask, or to add drops of base (one drop at a time)? Explain your response.
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06/08/20

10 help me please

An unknown gas at 35.1 ∘C and 1.05 atm has a molar mass of 16.04 g/mol. Assuming ideal behavior, what is the density of the gas?
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06/05/20

How many grams of H2O(l) would be made to react if 58.9 kJ of energy were provided?
The following thermochemical equation is for the reaction of water(l) to form hydrogen(g) and oxygen(g). 2H2O(l)2H2(g) + O2(g)    H = 572 kJ How many grams of H2O(l) would be made to react if 58.9... more
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06/05/20

The specific heat of aluminum calculated from her data
In the laboratory a student finds that it takes 151 Joules to increase the temperature of 12.2 grams of solid aluminum from 21.8 to 36.6 degrees Celsius.The specific heat of aluminum calculated... more
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06/04/20

Which of the following is a conjugate acid-base pair?
Which of the following is a conjugate acid-base pair?a)NaF and F ^-b)H3O^+ and OH^-c)None of thesed)all of thesee) HNO3 and HNO2
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05/24/20

When reactants (LHS substances) are removed from a chemical reaction at equilibrium ... 
When reactants (LHS substances) are removed from a chemical reaction at equilibrium ... a) The equilibrium shifts to the LHSb) The equilibrium is not changedc)None of thesed) The equilibrium shifts... more
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05/18/20

Balance the redox reaction below using the half-reaction method. Fe3+(aq) + Gd(s)  Fe2+(aq) + Gd3+(aq)
Balance the redox reaction below using the half-reaction method. Fe3+(aq) + Gd(s)  Fe2+(aq) + Gd3+(aq) (a) To show your method, write the balanced half reactions below. Use the smallest integer... more
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05/16/20

What volume of copper (density 8.96 g/cm3) would be needed to balance a 2.05 cm3 sample of lead (density 11.4 g/cm3) on a two-pan laboratory balance?
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05/16/20

Thermochemistry

Use bond energy values to calculate the enthalpy change in kJ for the reaction represented in the equation below. Give the quantity and unit, and don't forget the + or -... more
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05/08/20

Anyone understand chem?

Solve for the by electroplating via electrolysis for each of the following sets of conditions, and then rank the masses by magnitude from smallest largest.Metal. Reduction half reaction (Ag). ... more
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05/04/20

Water and bonding, combustion, chemistry ocr a level
1. Explain why a small proportion of molecules of water have a relative molecular mass of 20?2. What mass of CO2 in grams, is formed by the complete combustion of 42m3, measured at RTP, of propane?
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