10/21/20

Errors in standard dilution
What are some errors that could occur when making a standard dilution and when plotting a calibration curve?What about errors using a spectrophotometer? Thank you
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10/21/20

Theoretical mass of copper (II) oxide formed from copper (II) hydroxide . 15 mL of 6.0 M H2SO4
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10/21/20

Theoretical mass of copper (II) hydroxide formed from copper (II) nitrate. 30 mL of 3.0 M NaOH
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10/21/20

Theoretical mass of copper (II) nitrate formed from copper metal. The mass is of Cu is 0.503g

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10/21/20

According to the following reaction, how many grams of ethane (C2H6) will be formed upon the complete reaction of 22.8 grams of ethylene (C2H4) with excess hydrogen gas?
hydrogen (g) + ethylene (C2H4) (g) ethane (C2H6) (g)
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10/21/20

For the reaction 2CH4 (g) + 3 Cl2 (g) → 2 CHCl3 (l) + 3 H2 (g), ΔH° = -118.6 kJ. ΔH°f = -134.1 kJ/mol for CHCl3 (l). Find ΔH°f for CH4 (g).
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10/21/20

For the reaction I2(g) → I2(s), ΔH° = -62.4 kJ at 25°C. Based on these data, at 25°C...
A) ΔH°vap = -62.4 kJ/mol.B) ΔH°vap = 62.4 kJ/mol.C) ΔH°sub = -62.4 kJ/mol.D) ΔH°sub = 62.4 kJ/mol.
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10/21/20

When 1.00 mol of benzene is vaporized at a constant pressure of 1.00 atm and at its normal boiling point of 80.1°C, 33.9 kJ are absorbed and PΔV for the vaporization process is equal to 2.90 kJ
What is delta E?note: does delta H = 33.9kJ ..?
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10/21/20

Find ΔE° for the reaction below if the process is carried out at a constant pressure of 1.00 atm and ΔV (the volume change) = -24.5 L. (1 L ∙ atm = 101 J)
2 CO(g) + O2 (g) → 2 CO2(g) ΔH° = -566. kJ
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10/21/20

Which of the following would give a positive test result upon treatment with AgNO3?
a. Cl- b. ClO- c. ClO2- d. ClO3-
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10/20/20

Given: 4 NO2(g) + O2(g) → 2 N2O5(g) ΔH° = -110.2 kJ find ΔH° for N2O5(g) → 2 NO2(g) + 1/2 O2(g).
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10/20/20

Net Ionic Equations
i. Predict the products of the reaction and their physical states ii. Balance the reaction iii. Write the complete ion equation iii. Write the net ionic equation(NH4)2S(aq) + Fe(NO3)3(aq) ... more
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10/20/20

Find ΔE° for the reaction below if the process is carried out at a constant pressure of 1.00 atm and ΔV (the volume change) = -24.5 L. (1 L ∙ atm = 101 J)
2CO (g) + O2 (g) --> 2CO2 (g) Delta H = -566 kJ
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10/20/20

Ionic equations
i. Predict the products of the reaction and their physical states ii. Balance the reaction iii. Write the complete ion equation iii. Write the net ionic equation Na2CO3(aq) + HNO3(aq)  Balanced... more
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10/20/20

question is in the description
A 28.9 mL sample of 0.327 M ammonia, NH3, is titrated with 0.323 M hydrochloric acid.After adding 12.3 mL of hydrochloric acid, the pH is .Use the Tables link in the References for any equilibrium... more
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10/20/20

Which of the following statements is/are TRUE?
Which of the following statements is/are TRUE? Group of answer choices:-Mg atom is larger than Be atom.-An Mg2+ ion has a larger radius than an Mg atom.-An I− ion has a larger radius than an I... more
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10/20/20

What is the electron configuration of the oxide anion O2−?
What is the electron configuration of the oxide anion O2−?
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10/20/20

Which of the following sets of quantum numbers represents the last electron added to the iron (Fe) atom?
Which of the following sets of quantum numbers represents the last electron added to the iron (Fe) atom?-n = 3, ℓ = 2, mℓ = +1-n = 3, ℓ = 0, mℓ = +1-n = 3, ℓ = 1, mℓ = +1-n = 4, ℓ = 1, mℓ = +2-n =... more
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10/20/20

Which of the following is the correct electron configuration for Se2−? 
Which of the following is the correct electron configuration for Se2−? Group of answer choices-[Ar]4s24d104p6-[Ar]4s23d104p2-[Ar]4s23d104p4-[Ar]4s23d104p6
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10/20/20

Which of the following is/are TRUE about the element?
An element has an electron configuration of [Ar]4s23d104p5. Which of the following is/are TRUE about the element? Select ALL statements that are true about the element.Group of answer choices:-The... more
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10/20/20

How many p electrons are there?
How many p electrons are there in an atom of gallium (Ga)? 
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10/20/20

A straw rocket is launched with a net Force of 1.5 N. The straw rocket has a mass of 0.005 kg. What is the acceleration of the rocket? Show your work
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10/20/20

A sky diver with a mass of 80 kg jumps from a plan. They are accelerating at a constant rate due to gravity which is 9.8 m/s2. What is the net Force of the sky diver? Show your work
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10/20/20

A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.
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10/20/20

chemistry precipitate

A student mixes 45.0 mL of 3.50 M Pb(NO3)2(aq) with 20.0 mL of 0.00241 M NaI(aq) . How many moles of PbI2(s) precipitate from the resulting solution? The 𝐾sp of PbI2(s) is 9.8×10−9.
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