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
jek_recluse [69]
3 years ago
15

The brightness of a star is determined by _____.

Chemistry
2 answers:
d1i1m1o1n [39]3 years ago
7 0

Answer:

Distance from the earth

Explanation: Trust me we just did this and I got 100 percent on all of it.

lesya [120]3 years ago
7 0

The actual answer is size and temperature

All stars are very hot. They resemble a gigantic furnace of atomic energy. Some stars are much hotter than others and appear to be brighter. The brightness of a star also depends upon its size and its distance from the Earth. Larger stars tend to be brighter, but a star closer to the Earth will appear brighter than one the same size that is farther away.

PLEASE GIVE ME BRAINLIEST

You might be interested in
Compute the number of grams(g) of lead in 22.5 moles of lead.
iogann1982 [59]

Answer:

4662 in grams

Explanation:

hope this helps :).

7 0
2 years ago
What is the percentage of oxygen in Li(NO2)3
BartSMP [9]

Answer:

66.2 % of O

Explanation:

Our compound is the lithium nitrite.

LiNO₂

This salt is ionic and can be dissociated: LiNO₂ →  Li⁺ + NO₂⁻

We determine the molar mass:

molar mass of Li + 3 . molar mass of N + 6 . molar mass of O

6.94 g/mol + 3. 14 g/mol + 6 . 16 g/mol = 144.94 g/mol

The mass of oxygen contained in 1 mol of lithium nitrite is:

6 . 16 g/mol = 96 g

So the percentage of oxygen present is:

(96 g / 144.94 g) . 100 = 66.2 %

3 0
2 years ago
A photon of light possesses 5 x 10^-19 J of energy. Calculate its frequency
saveliy_v [14]

Answer:

The frequency of photon is 0.75×10¹⁵ s⁻¹.

Explanation:

Given data:

Energy of photon = 5×10⁻¹⁹ J

Frequency of photon = ?

Solution:

Formula;

E = hf

h = planck's constant = 6.63×10⁻³⁴ Js

5×10⁻¹⁹ J =  6.63×10⁻³⁴ Js ×f

f =  5×10⁻¹⁹ J / 6.63×10⁻³⁴ Js

f = 0.75×10¹⁵ s⁻¹

The frequency of photon is 0.75×10¹⁵ s⁻¹.

4 0
2 years ago
As an electron in an atom moves from a higher energy state to a lower energy state, the atom
Verdich [7]

Answer:B

Explanation:

5 0
2 years ago
Fe2O3 + CO → Fe + CO2 If 2 moles of Fe2O3 react with 9 moles of CO, how many moles of each product are formed?
Y_Kistochka [10]

Answer: B. 4 moles Fe and 3 moles CO2

Explanation:

write a balanced chemical reaction

that is FeO3 + 3 CO → 2 Fe + 3CO2

2 moles of Fe2O3 reacted with 3 x2=6 moles of Co to form Fe and CO2 therefore CO was in excess and Fe2O3 was limiting reagent.

use the mole ratio to determine the moles of each product.

that is the mole ratio 0f Fe2O3 : Fe is 1:2 therefore the moles of Fe = 2x2=4 moles

the mole ratio of Fe2CO3 : CO2 is 1: 3 therefore the moles of Co2 = 2 x3 = 6 moles

8 0
2 years ago
Read 2 more answers
Other questions:
  • The phase change in which a substance changes from a gas directly to a solid is _____..
    10·2 answers
  • What is electropositivity and electronegativity? Between group 1 and group 17, which is electropositive and electronegative?
    14·1 answer
  • This element is a gas at room temp, and we breathe it to survive. It has 8 protons
    11·2 answers
  • Why are plastic containers preferred to glass containers for storing chemicals in the laboratory?
    14·1 answer
  • How many neutrons are in lithuim-8
    8·1 answer
  • Which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxi
    13·1 answer
  • Why is U-235 the most common nuclear fuel instead of the more abundant U-238? State a clear topic sentence and support it with e
    12·1 answer
  • Help pls!!!!!!!!!!!!!!!!!!!!!!!
    15·2 answers
  • How many zeroes are significant in the measurement 0.0400200?
    7·2 answers
  • An ice wedge shattering a slab of shale<br><br> a<br> Chemical Change<br> b<br> Physical Change
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!