11/18/21

Which statement BEST describes how many Aluminum atoms are needed when making Aluminum chloride?
1 Aluminum atom is needed because Aluminum donates one valence electron to Chlorine.3 Aluminum atom is needed because Aluminum donates three valence electron to Chlorine.3 Aluminum atom is needed... more
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11/18/21

Calculate the average atomic mass of an imaginary element Chemistrium symbol Ch given that there are three naturally occurring isotopes of the following Mass and abundancies:
Ch – 501, 25% , Ch – 504, 40% , Ch – 505 , 35% 
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11/16/21

How many gallons of water must be added to 10 gallons of 5% hydrogen peroxide solution to get a 1% solution?
I need the answer but I also would like an explanation of how you got that answer so I can figure out other equations like it in the future. I'm taking a chemistry course for work and cannot... more
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11/16/21

Chemistry Acid and Base
What quantity in moles of HCl need to be added to 200.0 mL of a 0.200 M solution of NaF to make a buffer with a pH of 3.00? (Ka for HF is 6.8 × 10⁻⁴)
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11/16/21

making a buffer solution of salicylic acid
how can I make a buffer solution of salicylic acid? I will use ( McIlvaine buffer )
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11/16/21

A solution was prepared by dissolving 23 grams of ethyl alcohol in a 56 grams of water. Calculate the volume percent and mole fraction of this solution.
A solution was prepared by dissolving 23 grams of ethyl alcohol in a 56 grams of water. Calculate the volume percent and mole fraction of this solution.
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11/16/21

Find the molality and molarity of the sample consisting 75% Copper and 25% Nickel by mass. The computed density of this sample is 0.00639 g/mm3.

.Find the molality and molarity of the sample consisting 75% Copper and 25% Nickel by mass. The computed density of this sample is 0.00639 g/mm3.
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11/16/21

Find the heat of reaction for this target reaction: CO2(g) + H2O(l) → C12H22O11(s) + O2(g) (unbalanced)
Given the following data:∆Hf Values of Selected Chemicals (kJ/mol)C12H22O11(s) = -2222.31 CO2(g) = -393.5H2O(g) = -241.826 CO(g) = -110.5H2O(l) = -285.840 O2(g) = ?Fill in the missing value
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11/16/21

1) Find the enthalpy of this target reaction (show all your work):
C(s, diamond) + O2(g) → CO2(g) ∆H = −395.4 kJ/mol2 CO2(g) → 2 CO(g) + O2(g) ∆H = 566.0 kJ/molC(s, graphite) + O2(g) → CO2(g) ... more
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11/16/21

The 𝐾sp of Ag2CrO4 is 1.12×10−12 . What is the solubility (in mol/L) of silver chromate in 1.20 M potassium chromate aqueous solution?
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11/15/21

Prepare 50 mL of an aqueous 0.50% (v/v) NaHCO3 solution.
Set up the calculation for how much you need for the solution.
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11/15/21

Na+1 Electron Configuration
what is Na+1 Electron Configuration, noble gas notation, orbital notation and E-dot
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11/15/21

Calculate Kc if Kp for the following reaction is Ag₂CO₃ (s) ⇌ 2 Ag⁺ (g) + CO₃²⁻ (g) at 35 ᵒC is 0.145.
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11/15/21

Calculate the formal charge for each atom in BrO⁻. The first formal charge refers to Br and the second formal charge refers to O.
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11/15/21

Choose the correct statement about bonding between beryllium and chlorine in beryllium chloride.
A.Beryllium contributes two non bonding electrons for sharing with chlorine forming coordinate bond.B.Beryllium attract bonding electrons to itself to form sigma bond.C.Beryllium and chlorine atom... more
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11/15/21

Question about Theoretical Yield
An unkno‎‎wn sol‎‎ution labe‎‎led o‎‎nly by its co‎‎ncentration was a‎‎‎nalyzed. It w‎‎as l‎‎abeled to h‎‎ave “1.000‎‎ ‎‎‎M X(NO3)2” and know‎‎n to be a m‎‎e‎‎tal c‎‎ation. To find o‎‎ut t‎‎o... more
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11/15/21

Help with redox question
F‎‎‎‎‎‎ill in ‎‎the miss‎‎ing informa‎‎tion to balan‎‎ce the eq‎‎uation: Hint: Mn‎‎O2 is on‎‎e of the pr‎‎oducts, so w‎‎hat med‎‎ium sh‎‎ould y‎‎ou us‎‎e to balan‎ce? _H2C‎‎‎‎‎O + _‎‎H2‎‎‎‎O +... more
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11/15/21

Help with Chemistry redox Question
‎‎‎‎‎‎‎‎‎Cl2⟶Cl−+ClO−W‎‎‎hat is th‎‎‎e r‎‎educing ag‎‎ent? W‎‎hat is the oxi‎‎dizing ag‎‎ent? H‎‎ow ma‎‎ny electr‎‎ons ar‎‎e lo‎‎st and g‎‎ained in the r‎‎‎eaction? (positive integers only) W‎‎hat... more
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11/15/21

How to draw the structure of:
hexapeptide NH3+-MIGHTY-COO-
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11/15/21

Calculate the energy emitted when a line with 2166 nm is formed . Given h=6.6256 x 10⁻³⁴ Js and c = 3.00 x 10⁸ ms⁻¹
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11/15/21

Calculate the volume (in mL) that a 1.55 x 10⁻³ mol sample of a gas will occupy at 290 K and a pressure of 126 torr.
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11/15/21

determining the volume of base needed to titrate
A chemistry student weighs out 0.0903g of hypochlorous acid HClO into a 250.mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid... more
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11/15/21

Thermochemistry
38.5 g of ammonium nitrate was added to 100.0 mL of water. The initial temperature of the water was 25.0 °C. After dissolution, the water temperature was measured at 5.80 °C. What is the enthalpy... more
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11/15/21

Complete and balance the following redox reaction in basic solution
Complete and balance the following redox reaction in basic solutionCr2O7^2- (aq) + Hg (l) ----> Hg^2+ (aq) + Cr^3+ (aq)
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11/14/21

Calculate the volume of ethyl alcohol in a 950 ml bottle of whiskey whose label indicates that its concentration by volume is 45%.
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