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Gwar [14]
3 years ago
5

How are the sizes of stars measured? I just need a simple answer

Chemistry
1 answer:
S_A_V [24]3 years ago
7 0
They are determined by the length of time it takes for light to travel from the Earth to the desired star
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A 50 g sample of an unknown metal is heated to 90.0C. It is placed in a perfectly insulated container along with 100 g of water
sergejj [24]
Q unknown = -Q H2O
Q H2O= (100g x 4.18 J/g C x (25C - 20C)
Q H2O = 2090J

-2090J = (50g x c x (25C-90C)
-2090J = -3250c
.64 = c

I am a high school student and have done this problem a few months ago for my test, hope this helps
4 0
3 years ago
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Ratio of nitrogen gas to helium
GarryVolchara [31]

Answer:

1 to 696

The expansion ratio of liquefied and cryogenic from the boiling point to ambient is: nitrogen 1 to 696. liquid helium 1 to 757. argon 1 to 847.

Explanation:

4 0
3 years ago
A common laboratory method for preparing a precipitate is to mix solutions containing the component ions. Does a precipitate for
laiz [17]

Answer:

CaF2 will not precipitate

Explanation:

Given

Volume of Ca(NO3)2 = 10 ml

Molar concentration of Ca(NO3)2 = 0.001

Volume of NaF = 10 ml

Molar concentration of  NaF  = 0.0001

Ksp for CaF2 = 3.2 * 10^ {-11}

CaF2 will precipitate if Q for the reaction is greater than ksp of CAF2

Moles of calcium ion

= 10 * 0.001\\= 0.01

[Ca2+] = \frac{0.01}{10 + 10} \\= \frac{0.01}{20} \\= 5 * 10^{-4}

Moles of F- ion

= 10 * 0.0001\\= 0.001

[F-] = \frac{0.001}{10 + 10} \\= \frac{0.001}{20} \\= 5 * 10^{-5}

Q = [Ca2+] [F-]^2\\= (5 * 10^{-4}) * (0.5* 10^-4)\\= 1.25 * 10^{-12}

Q is lesser than Ksp value of CaF2. Hence it will not precipitate

5 0
3 years ago
Provide at least three indicators of a chemical change that are present in burning a piece of paper.
Pie

Answer:

Some chemical indicators perceived while a piece of paper is burning are:

Production of an Odor: there is a smell of burnt paper

Change in Temperature:  combustion is a highly exothermic reaction , so the temperature increase

Change in Color: paper changes to ashes as the burning process occurs

3 0
3 years ago
on a trip to italy, Cheyne rented a car to tour the country. As he turned onto the highway, he noticed that the speed limit was
rjkz [21]
 The answer is 59mph.
8 0
3 years ago
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