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3 years ago

How can scientists determine what kind of atoms are in stars and nebulas?

1 answer:

4 0

Each element absorbs light at specific wavelengths unique to that atom. When astronomers look at an object's spectrum, they can determine its composition based on these wavelengths.
Not sure if this is 100% but I hope it helps.

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Which of the following chemical agents is used for sterilization? Which of the following chemical agents is used for sterilizati

lozanna [386]

Answer:

The correct answer is super critical fluids.

Explanation:

Supercritical fluids are the fluids which are compressed below their critical temperature, kept in liquid state and used above their boiling point.The most common example of this are : liquid carbon dioxide gas and water.

They have properties of gas and liquid.
They can easily effuse through solids like gas and dissolves other substance in them like liquid.

3 0

3 years ago

Assign oxidation numbers to the element in each of the following compounds. Remember an oxidation number is for one atom of the

worty [1.4K]

Answer:

a. x = + 2

b. x = + 3

c. x = + 2

d. x = + 3

Explanation:

The oxidation number is a formal charge assigned to an atom present in a molecule or formula unit or ion based on some arbitrary rules.

HgO

The oxidation number of Hg in HgO is:

x + (-2) = 0

x = +2

Al₄C₃

The oxidation number of Al in Al₄C₃ is:

4x +(3 × -4) = 0

4x - 12 = 0

4x = +12

x = 12/4

x = +3

c. CrF₂

x + ( 2 × - 1) = 0

x - 2 = 0

x = + 2

d. Fe₂S₃

2x + ( 3 × - 2) = 0

2x + (-6) = 0

2x = 6

x = 6/2

x = +3

7 0

3 years ago

An unknown amount of sodium azide (NaN3) reacts and produces 0.033 moles of nitrogen gas. What mass of sodium metal is produced

Monica [59]

Answer:

Mass of sodium metal is 130.87 gram

Explanation:

The complete reaction is

2 NaN3 --> 2 Na + 3 N2

We know that PV = nRT

n = $\frac{PV}{RT}$

On substituting the given values, we get

$n = \frac{\frac{99707}{101325}*75 }{0.082 *(273.15 +15)} \\n = 3.02$ moles of N2

Sodium azide's molar mass

3.02 *(2/3) = 2.013 moles

Mass = 2.03 * 65.01 = 130.87 gram

3 0

3 years ago

Is H-3 stable? Is He-3 stable? Is He-5 stable? Is Li-7 stable? Is Be-7 stable?

kiruha [24]

Answer:

no, yes, no, yes, yes

Explanation:

good luck!

8 0

3 years ago

Under what conditions does the hydrolysis of an amide bond occur?

Mademuasel [1]

Hi.

I did some digging and I think I found what you're looking for.

I found this on Q(uizlet)

basic or acidic conditions and the reactants must be heated.

~

5 0

3 years ago