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3 years ago

Massive stars have lower absolute brightness true or false

Chemistry

2 answers:

Juliette [100K]3 years ago

6 0

The answer should be false, because mass should not have to do with how bright a star is

Inessa [10]3 years ago

6 0

The brightness of a star is measured as luminosity. It is a simple factor of energy emitted by a star in a unit time or generally per second.

the following factors may affect the brightness of a star

a) Temperature of star

b) size of star: larger the size more the brightness

c) distance from observer : closer the star brighter it will appear

so massive stars or stars with large mass have lower absolute brightness will be false.

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Which of the following would be the most likely adaptation of a whale population to tolerate a rise in ocean temperatures?

GREYUIT [131]

It is better for the whales to go where the whales have the ability to dive longer and deeper to find cooler water.

5 0

3 years ago

You need to produce a buffer solution that has a pH of 5.50. You already have a solution that contains 10 mmol (millimoles) of a

balandron [24]

Answer:

56.9 mmoles of acetate are required in this buffer

Explanation:

To solve this, we can think in the Henderson Hasselbach equation:

pH = pKa + log ([CH₃COO⁻] / [CH₃COOH])

To make the buffer we know:

CH₃COOH + H₂O ⇄ CH₃COO⁻ + H₃O⁺ Ka

We know that Ka from acetic acid is: 1.8×10⁻⁵

pKa = - log Ka

pKa = 4.74

We replace data:

5.5 = 4.74 + log ([acetate] / 10 mmol)

5.5 - 4.74 = log ([acetate] / 10 mmol)

0.755 = log ([acetate] / 10 mmol)

10⁰'⁷⁵⁵ = ([acetate] / 10 mmol)

5.69 = ([acetate] / 10 mmol)

5.69 . 10 = [acetate] → 56.9 mmoles

6 0

3 years ago

Carbon and hydrogen will bond together to form a molecule which type of bond will they form and how will they form that bond

viva [34]

Answer:

the bond formed is covalent bond....

Explanation:

here,

carbon and hydrogen are both non-metals ,

hence the bond between them is formed by sharing of electron hence it's a covalent bond.

i hope it helped .......

3 0

3 years ago

PLZZZZZ HELP ME!!! 30PTS!!!!!

Andrei [34K]

This assignment seems to be something fun and educational for you, you decide what kind of rock is going to be the easiest for you to do research on and just be creative on how you explain it (:

Good Luck!

8 0

3 years ago

Read 2 more answers

What is the specific heat of silver if an 80 g sample is heated from 24 to 49 by adding 468.2??

rjkz [21]

Q = m. C. ΔT

Δt = Δf - Δi = 49.0 - 24.0 = 25ºC

C = Q / m . ΔT

C = 468.2 / 80.0 . 25

C = 468.2 / 2000

C = 0.2341 J/gºC

hope this helps!

3 0

4 years ago