02/12/21

Balancing redox half reactions

Cr2O7^-2 ➡️ Cr+3How would you balance this half reaction in acidic solution if you were to put on 1/2 in front of Cr2O7^-2 instead of 2 in front of Cr+3 to balance the chromium?1/2 Cr2O7^-2 ➡️ Cr+3
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02/12/21

Another common type of battery involves lithium and iron Which half cell will have a higher reduction potential? Which metal will be present at the cathode and which at the anode?
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02/12/21

Calculate the standard cell potential for a voltaic cell that uses Li/Li+ and Mn/Mn2+ half reactions. If your cell phone required 1.5 V to charge, would this voltaic cell work? Explain.
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02/12/21

Gas Law chemistry

Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq), as described by the chemical equationMnO^2(s)+4HCl(aq)⟶MnCl2(aq)+2H^2O(l)+Cl^2(g)How... more
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02/12/21

Gas Laws chemistry
Container A holds 727 mL of an ideal gas at 2.70 atm.Container B holds 169 mL of a different ideal gas at 4.10 atmIf the gases are allowed to mix together, what is the resulting pressure?
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02/11/21

Classify the compounds as acids, bases, or salts. HCN, (NH4)2SO4, HClO4, H2C2O4, Sr(OH)2, RbOH, KI, CaCl2.

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02/11/21

Rf-267, with a half-life of 1.3 hours. If 5000 atoms of Rf-267 are synthesized, how many atoms were left after 3.9 hours?
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02/11/21

Mixed Stoichiometry

How many liters of hydrogen gas at STP can be generated from the reaction of excess hydrogen chloride with 14.5 g of aluminum? Does this answer require scientific notation?
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02/11/21

Which choice is an exothermic change?
a. copper undergoes deposition on a surfaceb. copper hammered into shapec. copper chopped into piecesd. copper boilede. copper melted
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02/11/21

which substance is a homogenous mixture?
a. clam chowderb. waterc. gasolined. mercurye. bromine
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02/11/21

which substance is a pure substance
a. mayonaiseb. airc. argond. payday candy bare. salt water solution
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02/11/21

which substance is a heterogenous mixture?
a. carbon dioxideb. sodium chloridec. heliumd. aire. concrete
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02/11/21

If 2.04 mol of C5H12 reacts with excess O2, how many moles of CO2 will be produced by the following combustion reaction? C5H12+8O2⟶6H2O+5CO2
Answer looks like Moles of CO2: mol
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02/11/21

How many particles are in 65.7 moles of sugar?
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02/11/21

Determine the standard potential for each cell and identify the reactions as spontaneous or nonspontaneous as written. Hg2+(aq) + 2Cu(aq) → 2Cu2+(aq) + Hg
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02/11/21

Determine the standard potential for each cell and identify the reactions as spontaneous or nonspontaneous as written. 2Al3+(aq) + 3Cu(s) → 3Cu2+(aq) + 2Al(s)
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02/11/21

2 H2 (g) + O2 (g) →2 H2O (g) In this reaction, the change in entropy will be
Positive, Negative, or Zero?
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02/11/21

Single Replacement Reactions
Predict and balance the reaction below.Cadmium bromide + sodium sulfide.
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02/11/21

Single Replacement Reactions
Ag2 SO4 + Zn
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02/11/21

Which system in the human body would best be described as a closed system?
Question 4 options: circulatory system, which contains the blood vessels respiratory system, which we use to breathe with digestive system, which use to absorb nutrients from the food we eat
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02/11/21

What is the enthalpy of reaction for the following reactions
CO2 + H2 <===> CO + H2OCO + H2 <===> C + H2O
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02/11/21

Chemistry problem about equilibrium concentrations
A student ran the following reaction in the laboratory at 483 K: PCl3(g) + Cl2(g)     PCl5(g) When she introduced 0.448 moles of PCl3(g) and 0.477 moles of Cl2(g) into a 1.00 liter container, she... more
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02/10/21

An empty 2 Liter flask is filled with: 1.705 atm of CO(g), 0.900 atm of COBr2(g), and 1.895 atm of Br2(g), at 260°C and allowed to reach equilibrium according to the reaction:
COBr2(g)    ⇄   CO(g) + Br2(g)            Kp = 0.289 at 260°C Calculate the value of Kc at 260°C
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02/10/21

A beaker with 165 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M.
A student adds 4.40 mL of a 0.300 M HCl solution to the beaker.How much will the pH change? The pKa of acetic acid is 4.740.Keep getting the wrong answer!
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02/10/21

Percent Yield Chemistry Question
If 220 grams of Ca(OH)2 are used in this reaction and produced 297.5 grams (actual yield) of CaCl2, what would the % yield be?P.S You will need this The molar mass of Ca(OH)2 is 74 g/mol CaCl2 Is... more
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