4,365 Answered Questions for the topic Science

05/13/21

500 mL of a 2.5 M solution of NaCl is left uncovered and 200 mL of the solvent evaporated out. What is the new molarity of the solution?
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05/13/21

How much water needs to be added to a 125 mL of a 5 M solution to make it a 1.5 M solution?
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05/13/21

How cells give shape to our body?

I had a query from almost an year. How do cells of a part of our body, let's say hands, know in what shape to make the hand grow? For example how do the cells know that after the joint near... more
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Science Biology

05/12/21

Please help me on how to do Science DNA punnett squares!
How do you do DNA punnett squares? My science teacher showed me an activity we all have to do but he never really explained it so I'm confused. What I know so far is the fact that Dominant alleles... more
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Science Biology

05/12/21

Please help me on how to do Science DNA punnett squares!
How do you do DNA punnett squares? My science teacher showed me an activity we all have to do but he never really explained it so I'm confused. What I know so far is the fact that Dominant alleles... more
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05/11/21

for help in biology chemistry biochemistry zoology botany microbiology Contact 03043535992

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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 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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