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Tema [17]
4 years ago
13

If a reference point changes,which of the following statements is true?

Chemistry
2 answers:
artcher [175]4 years ago
7 0

Answer:

I believe the answer is  A. The position of the object changes

Hope this helps you, luv! :-) If you need anymore help, please ask me.

Nataly [62]4 years ago
5 0

Answer: Option (a) is the correct answer.

Explanation:

A reference point is defined as the point which represents motion or movement  of an object from one point to another.

For example, an object A is initially present at position X and after sometime it is moved to position Y.

This means that position of the object has changed now. This represents a reference point.

Thus, we can conclude that if a reference point changes the position of the object changes.

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Zinc dissolves in hydrochloric acid to yield hydrogen gas: zn(s) + 2hcl(aq) → zncl2(aq) + h2(g) when a 12.7 g chunk of zinc diss
N76 [4]

First calculate the initial moles of HCl.

HCl moles i = (1.45 moles / L) * 0.5 L = 0.725 moles HCl

 

Then calculate how much HCl is consumed by stoichiometry:

HCl moles consumed = (12.7 g Zn / 65.38 g / mol) * (2 moles HCl / 1 mole Zn) = 0.388 moles

 

So HCl moles left is:

HCl moles f = 0.725 – 0.388 = 0.3365 moles

For every 1 mole HCl there is 1 mole H, therefore:

H moles final = 0.3365 moles

 

So final concentration of H ions is:

<span>Concentration H = 0.3365 moles / 0.5 L = 0.673 M</span>

4 0
3 years ago
An atom of helium is smaller in width then an atom of hydrogen, but it's more then twice the mass. Why are these different?
VLD [36.1K]

Answer:

i think it cuz ones broken down by fision more

Explanation:

6 0
3 years ago
Crude oil may contain hundreds of different types of hydrocarbons. Some examples include: Butane(C4H10) Dodecane (C12H26) Octane
Klio2033 [76]

Answer:

The answer to your question is below

Explanation:

Material             Classification               Reason

Crude oil             Mixture                         Because we know that crude oil

                                                                 is composed of different substances.

Butane                Compound                   Because it is composed of carbon

                                                                 and hydrogen

Dodecane           Compound                  Because it is composed of carbon

                                                                and hydrogen.

Octane                Compound                  Because it is composed of carbon and

                                                                 hydrogen.

Benzene              Compound                  It is also composed of carbon and

                                                                 hydrogen.

Gasoline              Mixture                         It is a combination of hydrocarbons

Kerosene             Mixture                        It is a combination of hydrocarbons

Oxygen                Element                       We can find it in the periodic table.

Carbon dioxide   Compound                   It is composed of carbon and oxygen.

Water                   Compound                   It is composed of hydrogen and        

                                                                  oxygen.

8 0
4 years ago
Read 2 more answers
The process in beer production that produces carbon dioxide and ethanol is known as
arsen [322]

Answer:

Fermentation!

Explanation:

4 0
4 years ago
Read 2 more answers
PLEASE HELP!!
kondaur [170]
Number of moles of HCl = \frac{mass (g)}{molar mass}
                = \frac{27.8 g}{36.45} = 0.763 mole
From balanced equation:
4 moles of HCl give 2 moles Cl2
0.763 mole HCl give ?? mole Cl2
by cross multiplication :
= 0.38 mole Cl2
mass of Cl2 = moles x molar mass = 0.38 x 70.9 = 27 g 
3 0
4 years ago
Read 2 more answers
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