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
sashaice [31]
2 years ago
15

Spring and autumn both have a certain day where the amount of daytime hours

Chemistry
1 answer:
icang [17]2 years ago
7 0

Answer:

d. Equinox​

Explanation:

A certain day in spring and autumn where the amount of daytime hours and nighttime hours are the same is called equinox.

Equinox occurs twice in a year on March 20 and September 23rd.

  • During an equinox, the south and north hemisphere of the earth are receiving equal amount of sunlight.
  • The opposite of equinox is solstice in which the duration of light is unequal.
  • The equator is the only great circle that is a line of latitude.
You might be interested in
Why is an MRI is useful for diagnosing cancer but ineffective in treating it?
LekaFEV [45]
Bc an MRI is just a scanner it's not and never will be meant for treatment 
5 0
3 years ago
What is the electron configuration for<br> 08<br> 16
Elis [28]

The electron configuration for Oxygen : [He] 2s²2p⁴

<h3>Further explanation</h3>

Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d, and f. The maximum number of electrons for each sub-shell is  

• s: 2 electrons  

• p: 6 electrons  

• d: 10 electrons and  

• f: 14 electrons  

Charging electrons in the sub-shell uses the following sequence:  

<em>1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.  </em>

The element is Oxgen, with symbol O, and :

the atomic number=8=number of electron

the atomic mass=16

The electron configuration based on the number of electrons(for Oxygen=8), so the configuration :

\tt _8^{16}O:1s^22s^22p^4 or we can write with noble gas [He] 2s²2p⁴

3 0
2 years ago
Acetic acid is a weak acid with a pKa of 4.76. What is the concentration of acetate in a buffer solution of 0.2M at pH 4.9. Give
Ghella [55]

Answer:

[base]=0.28M

Explanation:

Hello,

In this case, by using the Henderson-Hasselbach equation one can compute the concentration of acetate, which acts as the base, as shown below:

pH=pKa+log(\frac{[base]}{[acid]} )\\\\\frac{[base]}{[acid]}=10^{pH-pKa}\\\\\frac{[base]}{[acid]}=10^{4.9-4.76}\\\\\frac{[base]}{[acid]}=1.38\\\\

[base]=1.38[acid]=1.38*0.20M=0.28M

Regards.

6 0
2 years ago
Which of the following best defines balanced forces?
Mars2501 [29]

Answer:

Balanced forces are forces that act in opposite directions and cancel each other out

let me know if you have any other questions

6 0
2 years ago
Read 2 more answers
Covalent Bonds <br><br> How many covalent bonds can Nitrogen atoms make ?
notsponge [240]
A nitrogen atoms can make 3 covalent bonds because it has three unpaired electrons

6 0
2 years ago
Read 2 more answers
Other questions:
  • I need help
    5·1 answer
  • PLEASE HELP!!! 20 POINTS!!!
    15·2 answers
  • Reflecting and refracting telescopes are used to gather radiation from space. Which of these statements best explains why a refr
    10·1 answer
  • Which of the following could be considered a scientific statement?
    7·2 answers
  • Calculate the mass of chloroform that contains 1.00X10^12 molecules of chloroform
    12·1 answer
  • How many valence electrons do the halogens have
    7·1 answer
  • Hcl and 1-isopropylcyclohexane formation
    13·2 answers
  • If a 200 g piece of aluminum has a density of 5.0 g/cm^3. what is its volume?​
    6·2 answers
  • 18 gram of sucrose is dissolved in 180 gram of water. Calculate the number of oxygen atoms in the solution.​
    12·1 answer
  • Helppp nowww plsss!!
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!