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
algol [13]
3 years ago
11

N 1868, helium was discovered by looking at the sun almost thirty years before it was discovered on earth. How was that possible

?
Group of answer choices

a,The size of the sun flares suggested that the matter was twice the mass of hydrogen

b,They captured cosmic rays from the sun that had helium in it

c,They found a meteorite that contained helium

d,By looking at the light from the sun they found a spectrun of light that was not from any known element
Chemistry
1 answer:
Free_Kalibri [48]3 years ago
5 0

Answer:

a im not sure tho

Explanation:

You might be interested in
The first ionization energy of mg is 735 kj/mol. calculate zeff.
Novay_Z [31]
2.25 I believe

Hope this helped!
STSN
7 0
3 years ago
In a laboratory setting, chemists strive to be
Kitty [74]
Accurate and precise
3 0
4 years ago
Several general characteristics of metabolic reactions or reaction pathways are listed below. sort them into the appropriate met
Kobotan [32]
Answers are:
Catabolism: 
- g<span>enerally exergonic (spontaneous): In this reactions energy is released.
- </span><span>convert NAD+ to NADH. Electrons and protons released in reactions are attached to NAD+.
- </span><span>generation of ATP. ATP is synthesis from ADP.
- </span><span>convert large compounds to smaller compounds. Foe example starch to monosaccaharides.
Anabolism:
</span><span>- convert NADPH to NADP+. Protons and electrons are used to make chemical bonds.
</span>- <span>convert small compounds to larger compounds.</span>
8 0
3 years ago
Read 2 more answers
What would happen to the block if it had a density of 0.500 kg/L and was placed in the same 100.0 L tank of water?
raketka [301]
I’m not sure if there was important information in the question before this one, but the answer based on the info I have is B.

The density of water is 1kg/L. Since the density of the block is less, it will float.
6 0
3 years ago
Read 2 more answers
A tire contains 1.50 mol of air at a gauge pressure of 205 kPa. If the volume of the air in the tire is 0.0120 m3, what is its t
Free_Kalibri [48]

Answer:

197.07 K

Explanation:

To solve this problem we can <u>use the PV=nRT equation</u>, where:

  • P = 205 kPa ⇒ 205 * 0.00986 = 2.02 atm
  • V = 0.0120 m³ ⇒ 0.0120 * 1000 = 12 L
  • n = 1.50 mol
  • R = 0.082 atm·L·mol⁻¹·K⁻¹
  • T = ?

We<u> input the data</u>:

  • 2.02 atm * 12 L = 1.50 mol * 0.082 atm·L·mol⁻¹·K⁻¹ * T

And <u>solve for T</u>:

  • T = 197.07 K
6 0
3 years ago
Other questions:
  • What is the correct label for a solution?
    9·1 answer
  • A 650.0 g hard-water sample contains 101 mg Ca.what is this concentration in parts per million
    14·1 answer
  • Which of the following constitutes a phase change
    13·1 answer
  • Number of SO42- ions in 20.4 g Cr2(SO4)3
    5·1 answer
  • 2- How many electrons make an energy level stable (happy) ?
    13·2 answers
  • N2+ 3H2 → 2NH3
    9·1 answer
  • Type the correct answer in the box. Express your answer to two significant figures.
    9·2 answers
  • If anybody known the answer plzz help me with this??​
    11·1 answer
  • If 1 kg of benzene (c6h6) is oxidized with oxygen, how many kilograms of o2 are needed to convert all of the benzene to co2 and
    5·1 answer
  • Determine if the following statement is true or false, and why. “A hypothesis can be proven true.”
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!