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Nina [5.8K]
4 years ago
9

How is the information about cats found in myths and fairy tales and legends different from information gathered through science

Chemistry
1 answer:
forsale [732]4 years ago
5 0
Scirnce uses a method of testing to declare rules or facts. myth and fairy tales have no way of being tested. cats are a physical creature we can see, test, and observe. a mythical idea canny be tested. for example: mermaids cannot be tested as we have none to observe.
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Is gas pressure increasing a physical or chemical change?
Komok [63]
In chemistry, there are two major types of change. As stated here, the physical change and the chemical change. 

To clearly differentiate these two,

Physical change happens when only the physical characteristics of the substance are changed. These physical characteristics includes the shape, mass, among others.

Chemical change happens when there is a production of new chemical that is brought about by the reaction. 

In this item, the increase in pressure only affects that physical property of the system. Hence, the answer should be PHYSICAL.
7 0
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Where would hcl lie on the pH scale?
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The first step in the process used to recover zinc metal from zinc sulfide ore is the reaction of zinc sulfide with oxygen gas t
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Answer : The mass of oxygen consumed in the reaction is 14.6 grams.

Explanation :

First we have to calculate the change in moles of oxygen.

Formula used :

w=\Delta nRT

or,

\Delta n=\frac{w}{RT}

where,

w = work done = 850.1 J

\Delta n = change in moles of gas = ?

R = gas constant = 8.314 J/mol.K

T = temperature = 675 K

Now put all the given values in the above formula, we get:

\Delta n=\frac{850.1J}{(8.314J/mol.K)\times (675K)}=0.152mol

Now we have to calculate the mass of oxygen consumed.

The balanced chemical reaction is,

2ZnS(s)+3O_2(g)\rightarrow 2ZnO(s)+2SO_2(g)

Here, the volume changes of solids can be ignored.

From the balanced chemical reaction, we conclude that

The number of moles oxygen required for the complete reaction = 3

Change in mole of oxygen = 0.152 mol

Molar mass of O_2 = 32 g/mol

So,

The mass of oxygen consumed = 3 x 0.152 mol x 32 g/mol = 14.6 g

Therefore, the mass of oxygen consumed in the reaction is 14.6 grams.

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A.) The number of electron shells increases.
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In a famous experiment , positively charge particles were aimed at a thin sheet of gold foil. The result of this experiment were
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However, a few of the particles were deflected by relatively large angles.

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