1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Whitepunk [10]
3 years ago
14

A hiker climbs a hill. How does the potential energy of the hiker change as she climbs higher?

Chemistry
1 answer:
zloy xaker [14]3 years ago
6 0
The answer should be A
You might be interested in
Please help a student out
e-lub [12.9K]

Answer:

9. B

10. A

I hope this really helps you out

8 0
3 years ago
A patient administered 20 mg of iodine-131. How many mg of this radioactive isotope will remain the body after 24 days? NEEDS AN
vredina [299]

Answer:

I need the answer too someone plzzz answer this!!!

Explanation:

7 0
3 years ago
How many moles are in 64.8 l of f2 gas
Licemer1 [7]
6.02×[10]1 ×64.8=3900.96 moles
7 0
3 years ago
You want to determine the molar
natima [27]

Answer:

I just guessed it out to be 3

3 0
1 year ago
A Cu2+ solution is prepared by dissolving a 0.4749 g piece of copper wire in acid. The solution is then passed through a Walden
Luda [366]

Answer:

Concentration of Cr_2O_7^{2-} = 0.03101 M

Concentration of MnO_4^- = 0.03721 M

Explanation:

A)

The reduction for Cr_2O_7^{2-} is;

Cr_2O_7^{2-} + 14 H ^+ _{(aq)}  + 6 e^- -----> 2 Cr^{3+} _{(aq)}+7H_2O _{(l)}

Cu^+_{(aq)} -----> Cu^{2+} _{(aq)} + 1 e^-

6 moles of Cu ^+ = 1 mole of Cr_2O_7^{2-}

number of moles of Cu reacted = \frac{mass \ of \ Cu \ wire }{ molecular weigh tof \ Cu wire }

number of moles of Cu reacted = \frac{0.4749}{63.55}

number of moles of Cu reacted = 0.00747 mole

number of moles of Cr_2O_7^{2-}reacted = \frac{0.00747}{6}

number of moles of Cr_2O_7^{2-}reacted = 0.001245 mole

Concentration of Cr_2O_7^{2-} = \frac{number \ of moles }{Volume}

Given that the volume = 40.15 mL = 40.15 *10^{-3}; we have:

Concentration of Cr_2O_7^{2-} = \frac{0.001245}{40.15*10^{-3}}

Concentration of Cr_2O_7^{2-} = 0.03101 M

B)

The reduction for MnO_4^- is;

MnO_4^- + 8H^+ + 5 e^- -----> Mn^{2+} + 4H_2O

Cu^+_{(aq)} -----> Cu^{2+} _{(aq)} + 1 e^-

5 moles of Cu ^+ = 1 mole of Cr_2O_7^{2-}

number of moles of Cu reacted = \frac{mass \ of \ Cu \ wire }{ molecular weigh tof \ Cu wire }

number of moles of Cu reacted = \frac{0.4749}{63.55}

number of moles of Cu reacted = 0.00747 mole

number of moles of MnO_4^- reacted = \frac{0.00747}{5}

number of moles of MnO_4^- reacted = 0.001494 mole

Concentration of MnO_4^- = \frac{number \ of moles }{Volume}

Given that the volume = 40.15 mL = 40.15 *10^{-3}; we have:

Concentration of MnO_4^- = \frac{0.001494 }{40.15*10^{-3}}

Concentration of MnO_4^- = 0.03721 M

3 0
3 years ago
Other questions:
  • When atoms are bonded together are they stable or unstable?
    15·1 answer
  • (a) How much negative charge is on each oxygen of the carbonate ion?
    5·1 answer
  • _AlBr3+_K2SO4>_KBR+_Al2(SO4)3
    5·1 answer
  • What product of Al makes it suiyable to be used in electric cables
    13·1 answer
  • The following equation represents the type of reaction called
    10·1 answer
  • ASAP (:
    8·1 answer
  • Not the best in chemistry please help
    5·2 answers
  • The single proton that forms the nucleus of the hydrogen atom has a radius of approximately 1.0×10−13cm. The hydrogen atom itsel
    13·2 answers
  • Why is secondary growth important to plants
    11·1 answer
  • Write a balanced equation for the following:
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!