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3 years ago

Compare and contrast all the periodic trends as you move down a group of metais. Organize

Chemistry

2 answers:

elena55 [62]3 years ago

4 0

Answer:

The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase.

Explanation:

Dose this help? Tell me if it dose.

zaharov [31]3 years ago

3 0

Answer:

The modern periodic table has a lot to say about the chemical elements, besides the atomic number, atomic weight, and symbol of the identified elements. For example, chemical elements falling in the same group share common properties, which are different from other groups. Also, go through the periodic table trends and you will come to know a regular pattern in the alteration of physical and chemical properties of elements, as you go from left to right, from top to down direction, and vice versa.

Explanation:

I hope this gives an idea to your question - Good luck ^w

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If you obtain 3.0 grams of aspirin from an experiment that could make no more than 3.14 grams, what is the percent yield?

Masteriza [31]

Answer:

96%

Explanation:

To find the percent yield, we can use this equation

$\frac{Actual}{Theoretical} *100$

The actual yield of aspirin is 3.0 and the theoretical is 3.14 in this case, so just plug the numbers in.

$\frac{3.0}{3.14} *100\\\\ =96$

Thus the percent yield is 96%

;)

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3 years ago

What type of reaction is shown below 2mgO + 2Mg + O2 is an example of a _________ chemical reaction.

ale4655 [162]

Synthesis, this is a synthesis reaction because it went from A+X=AX

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3 years ago

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Sunlight is composed of energy that is visible to humans and energy that is not visible to humans. Which statement describes how

Vilka [71]

Answer:

both forms of energy referred to in the question is light and heat energy

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4 0

3 years ago

CH4 with pressure 1 atm and volume 10 liter at 27°C is passed into a reactor with 20% excess oxygen, how many moles of oxygen is

BaLLatris [955]

Answer : The moles of $O_2$ left in the products are 0.16 moles.

Explanation :

First we have to calculate the moles of $CH_4$ .

Using ideal gas equation:

$PV=nRT$

where,

P = pressure of gas = 1 atm

V = volume of gas = 10 L

T = temperature of gas = $27^oC=273+27=300K$

n = number of moles of gas = ?

R = gas constant = 0.0821 L.atm/mol.K

Now put all the given values in the ideal gas equation, we get:

$(1atm)\times (10L)=n\times (0.0821L.atm/mol.K)\times (300K)$

$n=0.406mole$

Now we have to calculate the moles of $O_2$ .

The balanced chemical reaction will be:

$CH_4+2O_2\rightarrow CO_2+2H_2O$

From the balanced reaction we conclude that,

As, 1 mole of $CH_4$ react with 2 moles of $O_2$

So, 0.406 mole of $CH_4$ react with $2\times 0.406=0.812$ moles of $O_2$

Now we have to calculate the excess moles of $O_2$ .

$O_2$ is 20 % excess. That means,

Excess moles of $O_2$ = $\frac{(100 + 20)}{100}$ × Required moles of $O_2$

Excess moles of $O_2$ = 1.2 × Required moles of $O_2$

Excess moles of $O_2$ = 1.2 × 0.812 = 0.97 mole

Now we have to calculate the moles of $O_2$ left in the products.

Moles of $O_2$ left in the products = Excess moles of $O_2$ - Required moles of $O_2$

Moles of $O_2$ left in the products = 0.97 - 0.812 = 0.16 mole

Therefore, the moles of $O_2$ left in the products are 0.16 moles.

7 0

3 years ago

An adiabatic Turbine has R-134a as the working fluid. The inlet has a pressure of 200 kPa and a temperature of 20°C while the ou

Reptile [31]

Hey there!:

Detailed solution is shown below ask if any doubt :

3 0

3 years ago