CHEMISTRY HIGH SCHOOL

Chemistry: counting atoms in compounds worksheet #7.0.1
Answer please!!!!!

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Answer 1
Answer: Counting atoms in a compound can be done by taking one element at a time and multiplying the subscript of the element and the number of molecules of the compounds. For example, H2O, there are two atoms of H adn 1 atom of oxygen. 

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which of the molecules listed below directly donates a nitrogen atom for the formation of urea during the urea cycle?

Answers

Aspartate directly donates a nitrogen atom from the formation of urea during the urea cycle.
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A photon has a wavelength of 3.8 × 10-7 meters, which is between visible and ultraviolet. Calculate the energy of this photon.

Answers

Answer:

Energy of the photon is 5.2* 10^(-19) J.

Explanation:

Energy of a photon (E) is given by the following equation-

                                              E=(hc)/(\lambda )

Where h is the plank constant, c is the velocity of light and \lambda is the wavelength of photon.

Hence, E=((6.626* 10^(-34)J.s)* (3* 10^(8)m/s))/(3.8* 10^(-7)m)

So, E=5.2* 10^(-19) J

use the equation Energy of photon = h * c / wavelength

where h is Planck constant = 6.62607004 × 10-34 m2 kg / s

c is velocity of light in vacuum = 3.00 × 108 m/s and

wavelength value already you know

Which types of bond is formed between the two chlorine atoms in a chlorine molecule?

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Answer: D - a nonpolar covalent bond

Explanation: because opposites attract?
They achieve stable structures by sharing their single, unpaired electron.

Which substance can act as an arrhenius base in an aqueous solution

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The substance that can act as an Arrhenius base in aqueous solution is sodium hydroxide since NaOH dissociates in water giving the sodium ions and the hydroxide ions. An Arrhenius base is a substance that is characterized by forming hydroxide ions in an aqueous solution.

What is the salt produced when calcium hydroxide, Ca(OH)2, reacts with phosphoric acid, H3PO4, in a neutralization reaction?

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Explanation:

A neutralization reaction is a reaction in which two different compounds combine together and result in the formation of salt and water.

Foe example, Ca(OH)_(2) + H_(3)PO_(4) \rightarrow Ca_(3)(PO_(4))_(2) + 6H_(2)O

Therefore, salt of calcium phosphate Ca_(3)(PO_(4))_(2) is formed along with formation of water when compounds Ca(OH)_(2) and H_(3)PO_(4) react together.
3Ca(OH) _(2) +2H _(3) PO _(4)⇒6H _(2) O+Ca _(3)(PO _(4)) _(2)
Calcium phosphate.  Which is your Ca3(PO4)2.

An unstable nucleus loses the most mass if the nucleus emits(1) an alpha particle (3) a positron
(2) a beta particle (4) a gamma ray

Answers

The correct answer is option 1. An unstable nucleus loses the most mass if the nucleus emits an alpha particle. This type of electromagnetic radiation has the largest mass among the radioactive particles. When this particle is emitted from a nucleus, it loses two protons and two neutrons therefore large amount of mass is lost.
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