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
Alla [95]
3 years ago
8

In regards to sunspot activity, we are presently...

Chemistry
2 answers:
Maru [420]3 years ago
7 0
<span>D. doing very little to observe sunspot activity
</span>
almond37 [142]3 years ago
4 0
D is the correct answer
You might be interested in
A hydrogen-like ion is an ion containing only one electron. The energies of the electron in a hydrogen-like ion are given by the
yan [13]

Answer:

The ionization energy (in kJ/mol) of the helium ion is 21,004.73 kJ/mol .

Explanation:

E_n = -(2.18 10-18 J)\times \frac{Z^2}{n^2}

Z = atomic mass

n = principal quantum number

Energy of the electron in n=1,

E_1= -(2.18 10^{-18} J)\times \frac{4^2}{1^2}=-3.488\times 10^{-17} J

Energy of the electron in n = ∞

E_{\infty}= -(2.18 10^{-18} J)\times \frac{2^2}{\infty ^2}=0 J

Ionization energy of the He^+ ion:

I.E=E_{infty}-E_1=0-(-3.488\times 10^{-17} J)=3.488\times 10^{-17} J

I.E=3.488\times 10^{-20} kJ

To convert in into kj/mol multiply it with N_A=6.022\times 10^{23} mol^{-1}

I.E=3.488\times 10^{-20} kJ\times 6.022\times 10^{23} mol^{-1}=21,004.73kJ/mol

3 0
3 years ago
Read 2 more answers
HELP!!!
vredina [299]

Answer:

the answer is A

Explanation:

I dont really have an explanation but hope it helps

5 0
2 years ago
Read 2 more answers
If you added 15,000 calories to 2.0 L of water that was at 25.0 degrees C, what temperature would it be at when you finished?
rewona [7]

<u>Answer:</u>

<em>When we finish, the temperature would be 32.5℃</em>

<em></em>

<u>Explanation:</u>

Density of water = mass/volume

So,

Mass of water = Density × Volume

\\\\$=1.0   \times  2.0 L$\\\\$=1.0 \frac{g}{m L} \times 2000 m L$\\\\$\quad=2000 g$

$Q=m \times c \times \Delta T$

where

\Delta T = Final T - Initial T

Q is the heat energy in calories

c is the specific heat capacity (for water 1.0  cal/(g℃))  

m is the mass of water

plugging in the values  

$15000 \mathrm{Cal}=2000 \mathrm{g} \times 1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times \Delta T$

\\$\Delta T=\frac{15000 \mathrm{cal}}{2000 \mathrm{g} \times \frac{1.0 \mathrm{cal}}{g^{\circ} \mathrm{C}}}$\\\\$\Delta T=7.5^{\circ} \mathrm{C}$

Final T = ∆T + Initial T

= 7.5℃ + 25℃ = 32.5℃ (Answer).

5 0
3 years ago
If you have a solution that is 15 percent by mass of KCl in benzene, what is the new boiling point?
Serhud [2]

Answer:

https://www.chegg.com/homework-help/questions-and-answers/1-10-points-solution-15-percent-mass-kcl-benzene-new-boiling-point--901-c-b-921-c-c-821-c--q63751186

Explanation: Thats your answer

3 0
2 years ago
DONT SKIPP What type of bond will occur between lithium and bromine?
den301095 [7]
An ionic bond is formed between lithium and bromine.
4 0
3 years ago
Other questions:
  • What is restriction enzymes and what is it’s purpose?
    10·1 answer
  • Propose a reasonable synthesis to get benzylamine from toluene
    11·1 answer
  • This equation indicates that the reaction absorbs heat. What is this type of reaction called? H2O + heat → H2 + O2 A. an exother
    6·1 answer
  • Which of these properties would be possessed by both acids and bases? note: we do not mean mixing both in the same solution. we
    5·1 answer
  • Sodium is produced by electrolysis of molten sodium chloride. what are the products at the anode and cathode, respectively?
    15·1 answer
  • Which of the following are indicators of a chemical change?
    7·2 answers
  • The symbol for xenon xe would be part of the noble gas notation for the element
    7·2 answers
  • Help fast... thanks I’ll give you brainliest
    6·1 answer
  • A balloon with a volume of 0.5L at 293K is cooled to 20K. What is the balloon's new<br> volume?
    7·1 answer
  • HELP ASAP DUE TODAY!!
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!