CHEMISTRY HIGH SCHOOL

How many moles is 1.50x10^23 molecules of NH3?

Answers

Answer 1
Answer:

 The   number  of moles that are  1.50  x10^23  molecules of NH3  are  

 =0.249 moles


        calculation

 The number of  moles is calculated  using  Avogadro's  law  constant

that  is  According  to Avogadro's  law

                         1  moles  of a  substance = 6.02 x10^23  molecules

                                    ?    moles                =  1.50  x10^23  molecules


by  cross  multiplication


= [( 1.50  x 10^23  molecules  x  1 moles) / (6.02 x10^23)]  = 0.249  moles

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How many significant figures are in 340500

Answers

Answer:

Five significant figures

Explanation:

You have to change the number to standard form

340500 = 3.405×10**5

** means raise to power

10**5

Where five represents the number of significant figures.

Answer:

4!

Explanation:

If a reaction system has come to equilibrium, the concentration of products can be increaseda.
only if it is not reversible.
c.
by applying Le Châtelier’s principle.
b.
only if the temperature is low enough.
d.
under no circumstances.

Answers

If a reaction system has come to equilibrium, the concentration of products can be increased by applying Le Châtelier’s principle. The answer is letter C. The statements "only if it is not reversible",  "only if the temperature is low enough" and "under no circumstances" do not answer the question above.

A student blows up a balloon, seals it tightly, and places it in a very cold freezer. After a few hours, the balloon has gotten smaller. Which of the following statements best explains the decrease in the balloon’s volume? the multiple choice

a. As the temperature decreases, the molecules gain energy and move closer together, causing the balloon to shrink.

b.As the balloon releases energy, the molecules break apart into atoms, causing the balloon to shrink.

c.As the temperature decreases, the molecules lose energy and move closer together, causing the balloon to shrink.

d.As the balloon absorbs energy, the molecules move more quickly, causing the balloon to shrink.

Answers

I think the best answer is C. The statement that best explains the decrease in volume of the balloon is that as the temperature decreases, the molecules lose energy and move closer together, causing the balloon to shrink. Temperature is directly related to kinetic energy. As the temperature decreases the kinetic energy of the molecules decreases as well causing for them to move less and be closer to each other.

Which of the following is NOT a clue that a chemical change has occurred?a. change in color
b. production of a gas
c. formation of a precipitate
d. change in shape

Answers

change in shape is the answer because all chemical reactions only affect the chemical composition of the substance

From where does the nitrogen in the nitrogen cycle originate?a. root nodules of legumes
b. the atmosphere
c. decomposers
d. nitrifying bacteria

Answers

The correct answer is B. The nitrogen in the nitrogen cycle originate from the atmosphere. It forms approximately 78% of the Earth's atmosphere. However, this form is not usable because it is in its most stable form therefore unreactive. This nitrogen gas needs to be converted into nitrate compound for it to be usable. Then, the nitrogen cycle starts.

Answer:

B) the atmosphere

Explanation:

What is the name of the compound Al2(SO3)3?

Answers

Answer:

Name: Aluminum Sulfite

Explanation:

Systematic nomenclature: dialuminium tris [trioxosulfate (IV)]

Oxoanions: anions derived from removing H + from an oxo acid with a vulgar name:

(SO3)3^-2 (sulfite)

Metal cation according to valence number:

Al (III) or Al+3 (as a cation) (Aluminum)

There are different types of salts, in this case we have a simple salt and the nomenclature for binary substances is used when only one class of cation and one class of anion are present

So:

Al2(SO3)3: Aluminum Sulfite

Ions are charged particles that form when an atom (or group of atoms) receives or loses an electron, and ionic compounds are composed of these charged particles. An anion is a negatively charged ion, whereas a cation is a positively charged ion. Here Al₂(SO₃)₃ is aluminium sulfite.

Ionic compounds are defined as substances that are joined by ionic bonds. In order to reach their closest arrangement as a noble gas, elements can either gain or lose electrons. For the completion of the octet, ions are formed (either by gaining or losing electrons), which aids in their stabilization.

The name of the compound Al₂(SO₃)₃ is aluminium sulfite.

To know more about ionic compounds, visit;

brainly.com/question/13058663

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