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
cupoosta [38]
3 years ago
15

Which term is used to measure a star's brightness?​

Chemistry
1 answer:
Romashka-Z-Leto [24]3 years ago
5 0

Answer:

Magnitude

Explanation:

Astronomers define star brightness in terms of  magnitude (how bright the star appears from Earth)

You might be interested in
Select the statement(s) that describe how climate change ca
Len [333]

Answer:

I think b

Explanation:

I think b becuase I'd it increases it would cause for stuff I dont know i am bot good but a guess is worth a try

7 0
2 years ago
Argon-39 has a half-life of 269 years. How long will it take for 52.5 g of a 60.0 g sample to decay to its daughter isotope?
777dan777 [17]
For 60.0 g sample, if it remains 60-52.5=7.5 g, it will go through 60->30->15->7.5, 3 half-life. So the time being taken is 269*3=807 years.
3 0
3 years ago
Read 2 more answers
Which element can form an oxide with the general formula m2o or mo where m is a metal
boyakko [2]

Answer:

Because the compound has a formula of M2O, the number of valence electrons of M should be 1. Therefore, (1) Group 1 is the correct answer because elements in group 1 have 1 valence electron.

Explanation:

7 0
4 years ago
The electrolysis of water forms H2 and O2.
Monica [59]

Answer:

67.5% ≅ 67.6%

Explanation:

Given data:

Mass of water = 17.0 g

Mass of oxygen produced  (actual yield)= 10.2 g

Percent yield of oxygen = ?

Solution:

Chemical equation:

2H₂O   →   2H₂ + O₂

Number of moles of water:

Number of moles = mass/ molar mass

Number of moles = 17.0 g/ 18.016 g/mol

Number of moles = 0.944 mol

Now we will compare the moles of oxygen with water to know the theoretical yield of oxygen.

                        H₂O       :        O₂

                          2          :         1

                        0.944      :      1/2×0.944 = 0.472 mol

Mass of oxygen:

Mass = number of moles× molar mass

Mass = 0.472 mol × 32 g/mol

Mass = 15.104 g

Percent yield:

Percent yield = [Actual yield / theoretical yield] × 100

Percent yield = [ 10.2 g/ 15.104 g] × 100

Percent yield = 0.675 × 100

Percent yield = 67.5%

5 0
3 years ago
Read 2 more answers
Consider a solution that contains 60.0% r isomer and 40.0% s isomer. if the observed specific rotation of the mixture is –43.0°,
pychu [463]
The solution for this problem is:
Let x denote the specific rotation, R; andLet y denote the specific rotation, S = -x 
Solution:60 x - 40 x/100 = - 43
20x = - 4300Divide both sides by 20The answer is:x = - 215 is the specific rotation of the pure r isomer.
5 0
3 years ago
Other questions:
  • A magnifying glass is an example of a _______ lens.
    11·2 answers
  • Which gas sample STP has the same total number of molecules at 2.0 L of CO2(g) at STP
    8·1 answer
  • Which term is defined as the change in the direction of light when it goes from one medium into a different medium?
    8·2 answers
  • How many moles of H2 are needed to produce 18 moles of NH3 in the reaction below?
    14·2 answers
  • 7. De acuerdo con esta clasificación, no es un hidrocarburo A. CH3-CO-CH3 B. CH4 C. C6H6 D. CH3-CH2-CH3 8. No se considera como
    15·1 answer
  • Balanced chemical equation for the use of hydrogen fuel
    9·1 answer
  • Given that the approximate bond length of o–h in water is roughly 1 å, what is the approximate distance each proton "hops" betwe
    7·1 answer
  • What is the molarity of an intravenous glucose solution prepared from 108 g of glucose in 2.0 L of solution? 0.018 mol/L 0.30 mo
    15·1 answer
  • the highest concentration of life extorts in the top 200 meters of ocean water what is the most important factor that influences
    8·1 answer
  • PLX HELP ASAP!
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!