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3 years ago

describe how astronomers are able to use the light from a distant star to determine what elements make up the stars.

Chemistry

1 answer:

dlinn [17]3 years ago

7 0

Answer:

The spectra of the Sun and stars exhibited bright and dark lines called Fraunhofer lines. These were shown to be caused by elements emitting or absorbing light at specific wavelengths. Because each element emits or absorbs light only at specific wavelengths, the chemical composition of stars can be determined.

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Which of the following pair has a larger size? a)K or K- b)Br or Br- c)O2- or F- d) Li or Na

Anna11 [10]

Answer:

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Explanation:

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3 years ago

Fluorine gas and water vapor react to form hydrogen fluoride gas and oxygen. What volume of hydrogen fluoride would be produced

mafiozo [28]

Answer:

Hi, the question is incomplete. However, the question is about the calculation of volume of a product when the volume of one of the reactants is provided.

9.587 cm^3

Explanation:

The balanced equation for the chemical reaction is shown below:

$2F_{2(g)} + 2H_{2}O_{(g)}$ ⇒ $4HF_{(g)} + O_{2(g)}$

In the chemical reaction above, 2 moles of water produced 4 moles of hydrogen fluoride. If 4.8 cm^3 of water were consumed, we can calculated the volume of hydrogen fluoride that would be produced as follow:

Using STP, 1 mole of gas has a volume of 22.4 L

Thus, 4.8 cm^3 = 0.0048 L is equivalent to 2.14*10^-4

since 2 moles of water produced 4 moles of hydrogen fluoride, therefore, 2.14*10^-4 would produced 2*2.14*10^-4 = 4.28*10^-4 moles

we can convert the moles to L by multiplying with 22.4

volume of hydrogen fluoride = 4.28*10^-4 * 22.4 = 0.009587 L = 9.587 cm^3

5 0

4 years ago

Read 2 more answers

What cycloalkanes are present in a steroid ?

11Alexandr11 [23.1K]

Steroids are biologically very important compounds. They are made up of more that seventeen carbons. The structure of Steroid is comprised of a fused cycloalkane ring system. The simplest steroid and the main skeleton of all steroids is Gonane.

Gonane is made up of four cycloalkane rings i.e. tetracyclic hydrocarbon ring structure. Among these four rings 3 are cyclohexanes (designated as A, B and C) and one is cyclopentane (Designated as D). These four rings fuse to form a <span>cyclopentaperhydrophenanthrene.

The Nucleus (Gonane) of steroids along with some derivatives are shown below,</span>

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3 years ago

Determine the chemical formula for the compound, tetracarbonylplatinum(iv) chloride. [pt(co)4cl4] 2- [ptcl4](co)4 [pt(co)4]cl4 [

shusha [124]

Analyze the Name of complex Compound.

T<span>etracarbonylplatinum(iv) chloride

So, there are,
4 Carbonyl groups = 4 CO = (CO)</span>₄
1 Platinum Metal = 1 Pt = Pt
Unknown Chloride atoms = ?
In complexes positive part is always named first, so the sphere containing Pt and carbonyl ligands is written first,

[Pt (CO)₄]

The charge on sphere is +4 because CO ligand is neutral, and Pt has a Oxidation state of four as written in name (IV),
So,
[Pt (CO)₄]⁴⁺

Now, in order to neutralize +4 charge we should add 4 Chloride ions, So,

[Pt (CO)₄] Cl₄

4 0

3 years ago

A hydrated sample of cobalt(II) chloride was analyzed and found to consist of 45.44% water. What is the formula of the hydrate

valina [46]

Answer: the formula of the hydrate is CoCl2.6H2O

Explanation:Please see attachment for explanation

7 0

3 years ago