2 years ago

HELP PLEASE! EASY! How many stars does the barred-spiral galaxy contain?

2 answers:

const2013 [10]2 years ago

6 0

A barred-spiral galaxy is estimated to have 200 - 400 billion stars in it, although it could have a s many as a a trillion.
Hope this helps! Don't forget Brainliest! :)

Zepler [3.9K]2 years ago

5 0

Bars are found in approximately two-thirds of all spiral galaxies.

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The periodic table of elements is organized by the number of what?

DENIUS [597]

Protons, it was once organized by atomic mass but organizing by protons turned out to be better

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3 years ago

Place these elements in order of LOWEST electronegativity to HIGHEST.

mrs_skeptik [129]

Answer:

Barium

Molebdenum

Cobalt

Nitrogen

Explanation:

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2 years ago

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When 9.36 g sodium hydroxide is dissolved in enough water to make a total volume of 965 mL, what is the concentration of the res

SSSSS [86.1K]

Answer:

0.2425 M

Explanation:

Given mass = 9.36 g

Molar mass of NaOH = 39.997 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{9.36\ g}{39.997\ g/mol}$

$Moles\ of\ NaOH= 0.234\ mol$

Given that:- Volume = 965 mL = 0.965 L ( 1 mL = 0.001 L )

So,

Considering:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

$Molarity=\frac{0.234\ mol}{0.965\ L}=0.2425\ M$

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3 years ago

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Determine the number of grams of sodium carbonate needed to prepare 100.0 ml of a 2.5 m solution

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Answer:

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Explanation:

First we convert 100.0 mL to L:

100.0 mL / 1000 = 0.100 L

Now we calculate how many moles of sodium carbonate are needed, using the definition of molarity:

Molarity = moles / liters

moles = molarity * liters

2.5 M * 0.100 L = 0.25 mol

Finally we convert 0.25 moles of sodium carbonate into grams, using its molar mass:

0.25 mol * 106 g/mol = 26.5 g

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2 years ago

How do you know the difference between a compound and mixture?

lorasvet [3.4K]

Answer:

A compound can only be seperated through chemical means while a mixture are formed when two substances are added together without chemical bonds being formed.

Explanation:

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3 years ago