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3 years ago

8

When an element of theatre resembles observed reality, it is considered _______________?

1 answer:

Kamila [148]3 years ago

6 0

Realistic because of the dominant form of European drama in the late nineteenth century.

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Why do atomic model has changed over time

Elenna [48]

The model of the atom has dramatically changed over many many years.We learned atoms make up different substances and are the smallest particles of matter, which have subatomic particles that are very small portions of matter. At first scientist only thought there were electrons which are negatively charged.

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3 years ago

Can anyone answer this please

AlladinOne [14]

Answer:

where is the question

Explanation:

i dont see it

7 0

3 years ago

A sample initially contains 8.0 moles of a radioactive isotope. How much of the sample remains after four half-lives? Express yo

Tju [1.3M]

Answer:

0.50 mol

Explanation:

The half-life is <em>the time required for the amount of a radioactive isotope to decay to half that amount</em>.

Initially, there are 8.0 moles.

After 1 half-life, there remain 1/2 × 8.0 mol = 4.0 mol.

After 2 half-lives, there remain 1/2 × 4.0 mol = 2.0 mol.

After 3 half-lives, there remain 1/2 × 2.0 mol = 1.0 mol.

After 4 half-lives, there remain 1/2 × 1.0 mol = 0.50 mol.

6 0

3 years ago

Ammonium carbonate decomposes upon heating according to the following balanced equation:

Ugo [173]

Answer : The total volume of gas produced are, 11.5 L

Explanation :

First we have to calculate the moles of ammonium carbonate.

$\text{Moles of }(NH_4)_2CO_3=\frac{\text{Mass of }(NH_4)_2CO_3}{\text{Molar mass of }(NH_4)_2CO_3}$

Molar mass of $(NH_4)_2CO_3$ = 96.094 g/mol

$\text{Moles of }(NH_4)_2CO_3=\frac{11.9g}{96.094g/mol}$

$\text{Moles of }(NH_4)_2CO_3=0.124mol$

Now we have to calculate the moles of total gas.

The given balanced chemical reaction is:

$(NH_4)_2CO_3(s)\rightarrow 2NH_3(g)+CO_2(g)+H_2O(g)$

From the balanced chemical reaction we conclude that,

As, 1 mole of $(NH_4)_2CO_3$ react to give 4 mole of gas

So, 0.124 mole of $(NH_4)_2CO_3$ react to give $0.124\times 4=0.496$ mole of gas

Now we have to calculate the volume of gas.

Using ideal gas equation:

$PV=nRT$

where,

P = Pressure of gas = 1.05 atm

V = Volume of gas = ?

n = number of moles = 0.496 mole

R = Gas constant = $0.0821L.atm/mol.K$

T = Temperature of gas = $24.0^oC=273+24.0=297.0K$

Putting values in above equation, we get:

$1.05atm\times V=0.496mole\times (0.0821L.atm/mol.K)\times 297.0K$

$V=11.5L$

Thus, the total volume of gas produced are, 11.5 L

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3 years ago

How much tap water did you pour into each of the cups in Part A: Temperature of the lab?

Salsk061 [2.6K]

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3 years ago