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3 years ago

Which hypothesis is most supported by astronomers?

Chemistry

1 answer:

igor_vitrenko [27]3 years ago

8 0

Answer:

Once I read a NASA post where they were saying that the universe keeps expanding as matter keeps forming and cooling down thus adding to the size of the universe so keeping this in mind, the best answer choice is, <u>option A. The universe is currently expanding and will continue to expand.</u>

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DUPLICATE. The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to

Law Incorporation [45]

At the half equivalence point [HA] = [A-] and pH = pKa

<span>if Ka is 5.2e-5 then pKa = pH = 4.28</span>

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3 years ago

Sesh wants to create a device to transmit an electrical current. He has the following materials: pure water (H2O), brass (Cu3Zn2

Sunny_sXe [5.5K]

Use the brass foil to carry the current, because metals conduct electricity well in the solid state.

Dissolve the calcium chloride in water, because ionic compounds conduct electricity well when dissolved.

Pure water, sugar, or methane are not useful because they are covalent compounds and do not conduct an electric current.

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3 years ago

Read 2 more answers

Which expression represents the concentration of OH– ions in solution? a. [OH–]  10–14 b. 10–14  [H3O+] c. 10–14  [H3O+] d. 1

7nadin3 [17]

Answer:

10^-14 / [H3O+]

Explanation:

Hydronium (H3O+) and hydroxide ions (OH-) are both present in pure water and in all aqueous solutions.

Their respective concentrations in water are 10^-7 M each and are inversely proportional to each other as given by the ion product of water, Kw.

Kw = [H3O+][OH−]

Where Kw = 1.0 * 10^-14,

[H3O+] = concentration of hydronium ions

[OH-] = concentration of hydroxide ions

Therefore, [OH-] = Kw / [H3O+]

[OH-] = 10^-14/[H3O+]

7 0

3 years ago

Ammonium perchlorate is the solid rocket fuel used by the U.S. Space Shuttle. It reacts with itself to produce nitrogen gas , ch

SpyIntel [72]

Answer:

2.94 g of water are produced by this decomposition

Explanation:

We need to determine the reaction to solve this problem:

The reactant is the ammonium perchlorate

The products are N₂, Cl₂, O₂ and H₂O

The reaction is: 2NH₄ClO₄ → N₂ + Cl₂ + 2O₂ + 4H₂O

We convert the mass of the reactant to moles:

9.6 g . 1 mol / 117.45 g = 0.0817 moles

Ratio is 2:4. Let's make a rule of three:

2 moles of perchlorate produce 4 moles of water.

Then, 0.0817 moles of perchlorate will produce (0.0817 . 4)/2 = 0.163 moles

We convert the moles of produced water, to mass (g)

0.613 mol . 18 g / 1mol = 2.94 g

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3 years ago

What keeps the weather along the north and south Carolina coats milder

Svetradugi [14.3K]

I know that I am late but do you still need an answer?

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3 years ago