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
jasenka [17]
3 years ago
12

I need help with the first question, if you can help with the other two I would really appreciate it!​

Chemistry
1 answer:
Lorico [155]3 years ago
6 0

Answer:

5

Explanation:

You might be interested in
Which system sends messages to organs and tissues? excretory muscular nervous circulatory
vampirchik [111]

Answer:

Hi friend, the answer to your question is <em>NERVOUS SYSTEM</em>.

Explanation:

5 0
3 years ago
What does unsaturated zone mean?
Nadya [2.5K]
The unsaturated zone is the portion of the subsurface above the groundwater table. The soil and rock in this zone contains air as well as water in its pores. ... Unlike the aquifers of the saturated zone below, the unsaturated zone is not a source of readily available water for human consumption
6 0
3 years ago
Read 2 more answers
100 Points.
hodyreva [135]
I think it’s C but I’m not sure
6 0
3 years ago
Determine the amount of heat(in Joules) needed to boil 5.25 grams of ice. (Assume standard conditions - the ice exists at zero d
Yuki888 [10]
Following are important constant that used in present calculations
Heat of fusion of H2O = 334 J/g 
<span>Heat of vaporization of H2O = 2257 J/g </span>
<span>Heat capacity of H2O = 4.18 J/gK 
</span>
Now, energy required for melting of ICE = <span>  334 X 5.25 = 1753.5 J .......(1)
Energy required for raising </span><span>the temperature water from 0 oC to 100 oC =  4.18 X 5.25 X 100 = 2195.18 J .............. (2)
</span>Lastly, energy required for boiling water = <span>  2257X 5.25 = 11849.25 J ......(3)
</span><span>
Thus, total heat energy required for entire process = (1) + (2)  + (3)
                                                                        = 1753.5 + 2195.18 + 11849.25
                                                                        = </span><span>15797.93 J 
</span><span>                                                                        = 15.8 kJ
</span><span>Thus, 15797.93 J of energy is needed to boil 5.25 grams of ice.</span>
7 0
3 years ago
294 g of potassium dichromate contains 52 g of chromium and 39 g of potassium. What is the mass percent of oxygen in the compoun
IgorLugansk [536]
69.047% is the answer to this question
3 0
3 years ago
Read 2 more answers
Other questions:
  • How to prepare 250.00 ml of approximately 1.0 m hcl solution from the 2.5 m hcl solutio?
    9·2 answers
  • What ions exist in acid solutions
    11·1 answer
  • Which do you think would be safer for heating a flammable liquid sample contained in an open beaker, and Bunsen burner or an ele
    5·1 answer
  • Explain why the several different types of microscopes are all necessary.
    9·1 answer
  • A factory discharges clean, warm water into a nearby stream. Fish keep dying in this part of stream. Explain why.
    9·1 answer
  • Carrie went with her mother to the rifle range to practice shooting. Firing the rifle created the force needed to send the bulle
    6·2 answers
  • Using a meter stick and a ruler with millimeter and centimeter gradations, measure the following objects and record their measur
    12·1 answer
  • What is the maximum mass of ethyl alcohol you could boil with 2000 JJ of heat, starting from 17 ∘C∘C?
    8·2 answers
  • How many minutes would be required to electroplate 25.0 grams of chromium by passing a constant current of 4.80 amperes through
    13·1 answer
  • Im so alone and i really need friends and maybe more pls dont delete my quiestion
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!