4,347 Answered Questions for the topic Science

Science Chemistry

05/11/21

In a acid dry cell battery....
In a acid dry cell battery for which the reaction is Zn + 2 NH4Cl + 2 MnO2 → ZnCl2 + 2 NH3 + Mn2O3 + H2O, what atom is reduced?a. O b. Cl c. Mn d. Zn e. N
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Science Chemistry

05/11/21

In a acid dry cell battery...
In a acid dry cell battery for which the reaction is Zn + 2 NH4Cl + 2 MnO2 → ZnCl2 + 2 NH3 + Mn2O3 + H2O, what acts as the oxidizing agent?a. MnO2 b. NH4Cl c. Zn d. ZnCl2 e. Mn2O3
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Science Chemistry

05/11/21

What is the standard cell potential for the following reaction?
Cr3+(aq) + 3e- Cr(s); Eo = -0.74V Pb2+(aq) + 2e- Pb(s); Eo = -0.13V What is the standard cell potential for the following reaction? 2Cr(s) + 3Pb2+ 3Pb(s) + 2Cr3+(aq)a. –0.61V b. –0.87V c. 1.83 Vd.... more
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Science Chemistry

05/11/21

Which of the following cations is capable of oxidizing...
Given:Pb2+(aq) + 2e– --> Pb(s); E° = –0.13 VZn2+(aq) + 2e– --> Zn(s); E° = –0.76 VAl3+(aq) + 3e– --> Al(s); E° = –1.66 VMg2+(aq) + 2e– -->  Mg(s); E° = –2.38 VV2+(aq) + 2e– -->... more
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Science Chemistry

05/11/21

Consider the following cell reaction....
Consider the following cell reaction:2Hg2+(aq) + H2(g) → 2H+(aq) + Hg22+(aq); E°cell = 0.92 VUnder standard-state conditions, what is E° for the following half-reaction?Hg2+(aq) + 2e– → Hg22+(aq)
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Science Chemistry

05/11/21

Consider the following reduction potentials...
Consider the following reduction potentials:Cd2+(aq) + 2e– --> Cd(s); E° = –0.40 VPb2+(aq) + 2e– --> Pb(s); E° = –0.13 VCu2+(aq) + 2e– --> Cu(s); E° = 0.34 VBr2(l) + 2e– -->... more
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Science Biology Chemistry

05/10/21

SCIENCE HELP NEEDED!!
SCIENCE HELP NEEDED!!Can You physically remove the different parts of a compound ? true or false Can you vary the amounts being used when creating a mixture ? true or false
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Science Math Nursing Health

05/09/21

Medical Math Question

What is the most likely value for CaO2, if the hematocrit is 30?A. 16-20 vols%B. 12-16 vols%C. 8-12 vols%D. 4-8 vols%
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Science Chemistry

05/08/21

The boiling point of a benzene solution with a non-electrolyte solute is 90°C. Calculate the freezing point of the same solution.
please help. I'm confused with this problem
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05/07/21

Please provide guidance for the problem. What should I do to solve the problem about new unit pixel design?
Please provide guidance for the problem. What should I do to solve the problem about new unit pixel design? A hypothetical client working for a technology company demands a new design for their new... more
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05/07/21

Molar mass question3
CuCl2 + 2NaNO3 --> Cu(NO3)2 + 2NaCl15.0 grams of copper (ii) chloride react with 20.0 grams of sodium nitrate. (Using NaCl as the product)Find the Limiting reagent & the theoretical yield of... more
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05/07/21

Molar mass question2
How many liters of water are formed from 55 L of oxygenC6H12O6 + 6O2 --> 6CO2 + 6H2O(Answer needs 2SF)
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05/07/21

What is the net force acting on this object?
The forces acting on an object are 39N[N], 13N[S], and 12N[N]. The net force acting on the object is:a. 38N[N] b. 64N[S]c. 64N[N]d. 14N[N]e. none of the above
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05/07/21

Chemistry question help
A buffer can be made by dissolvingboth hydrofluoric acid, HF, and sodium fluoride, NaFsodium fluoride, NaFhydrofluoric acid, HF
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05/07/21

Chemistry problem
Which molecule will experience hydrogen bonding with other molecules like it?PH4SO2NH3
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05/07/21

chemistry question
Which cation is a weak acid?Na+Ba2+Mn4+
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05/07/21

Chemistry problem
A voltaic cell will generate voltage ifthe half-reactions and concentrations in each half-cell are identicalthe redox reaction has a negative ΔG°the half-reaction with the more negative E° is the... more
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05/07/21

Chemistry question help
Which pair of compounds will form a buffer?HNO2 and LiNO2HCl and NaClH2SO3 and MgBr2
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Science Math Chemistry

05/07/21

please help me with chemistry
Iron has a specific heat of 0.450 J/g·°C. How much energy is required to raise the temperature of 435 g of iron from 43.0°C to 180.0°C? -------kJ
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Science Math Chemistry

05/07/21

please help me with chemistry

Given an exothermic reaction, which of the following is true?A. ΔH reaction is (+), ΔH surroundings is (-)B. ΔH reaction is (+), ΔH surroundings is (+)    C. ΔH reaction is (-), ΔH surroundings is... more
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Science Math Chemistry

05/07/21

Please help me with honors chem
Identify the following chemical reaction as exothermic or endothermic: CaCO3 + 178 kJ --> CaO + CO2A. EndothermicB. Exothermic    
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05/06/21

Worksheet chemistry

Practice Question #6 – Gram to Gram Mole Ratio Stoichiometry1.     Copper I iodide, CuI, is not stable enough to last long in storage, so it is generally made just prior to use. In can... more
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Science Chemistry

05/06/21

WORKSHEET stoic

____ CH4+___O2---->____CO2+____H2O1)How many moles of oxygen gas are needed to produce 2.14 moles of water?Anewer ____ mol2) How many moles of oxygen can be formed from 67 grams of carbon... more
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05/06/21

WORKSHEET stoic

____ CH4+___O2---->____CO2+____H2O1)How many moles of oxygen gas are needed to produce 2.14 moles of water? Anewer ____ mol2) How many moles of oxygen can be formed from 67 grams of carbon... more
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05/06/21

SCIENCE HELP NEEDED!!

Can You physically remove the different parts of a compound ? Can you vary the amounts being used when creating a mixture ?
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