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3 years ago

Which particle is formed when an atom donates electron?

1 answer:

3 0

D)Cation is the answer. A cation is a positive ion fromed by the removal of electrons from the outermost shell of an atom.

Let's take Na ( Sodium ) whose At. No is 11 as an example.
When we arrange them in electronic configuration Sodium has 3 shells. 2 in its innermost shell (K), 8 electrons in its 2nd shell which is named as 'L' & lastly 1 electron in its outermost shell (M).

We know that in an atom the no. of protons, neutrons and electrons are equal.

In case of sodium, when only electrons are reduced while protons remained same. Previously, the No. of protons and electrons were equal. But this time, There is an extra proton(+). This is the reason when an electron is removed we get a cation.

There are two factors that causes atoms to loose electrons -

1) Atomic Size

2) Nuclear Charge

You might be interested in

What makes the periodic table arrangement so unique and useful?

Zepler [3.9K]

Elements are ordered from left to right, increasing atomic number as they go. The periodic table allows us to find out and predict things about elements that haven’t been discovered yet!

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2 years ago

The relationship between an object's mass (m), its acceleration (a), and the applied force (F) is described in which of Newton's

Kay [80]

Answer: so the answer is A

Explanation: The relationship between an object's mass (m), its acceleration (a), and the applied force (f) is F=ma. ... This law requires that the direction of the acceleration vector is in the same direction as the force vectors.

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2 years ago

Vodka is composed of 40% ethanol and 60% water. Water is the _____. while ethanol is the __, and vodka is a _____?

Mars2501 [29]

Answer:

The answer is A. solvent, solute, solution.

Explanation:

3 0

3 years ago

Working on-board a research vessel somewhere at sea, you have (carefully) isolated 12.5 micrograms (12.5 ×10–6 g) of what you ho

german

Answer:

The value is $Z = 311.33 \ g/mol$

Explanation:

From the question we are told that

The mass of saxitoxin is $m = 12.5 mg = 12.5 * 10^{-6} g$

The volume of water is $V = 3.10 mL = 3.10 *10^{-3} L$

The osmotic pressure is $P = 0.236 = \frac{0.236}{760} = 3.105 * 10^{-4} atm$

The temperature is $T = 19^oC = 19 + 273 = 292 \ K$

Generally the osmotic pressure is mathematically represented as

$P = C * T * R$

Here R is the gas constant with value

$R = 0.0821 ( L .atm /mol. K)$

and C is the concentration of saxitoxin

$3.105 * 10^{-4} = C * 0.0821 * 292$

$C = 1.295 *10^{-5} mol/L$

Generally the number of moles of saxitoxin is mathematically represented as

$n = C * V$

=> $n = 1.295 *10^{-5} *3.10 *10^{-3}$

=> $n = 4.015 *10^{-8} \ mol$

Generally the molar mass of saxitoxin is mathematically represented as

$Z = \frac{m}{n}$

=> $Z = \frac{12.5 * 10^{-6}}{ 4.015 *10^{-8}}$

=> $Z = 311.33 \ g/mol$

5 0

3 years ago

Find the molar enthalpy of formation for paraffin wax (C2H526)) given the following reaction

pogonyaev

Answer: The molar enthalpy of formation for paraffin wax is -2460.5 kJ

Explanation:

The balanced chemical reaction is,

$C_{25}H_{52}(g)+38O_2(g)\rightarrow 25CO_2(g)+26H_2O(g)$

The expression for enthalpy change is,

$\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]$

$\Delta H=[(n_{CO_2}\times \Delta H_{CO_2})+(n_{H_2O}\times \Delta H_{H_2O})]-[(n_{O_2}\times \Delta H_{O_2})+(n_{C_{25}H_{52}}\times \Delta H_{C_{25}H_{52}})]$

where,

n = number of moles

$\Delta H_{O_2}=0$ (as heat of formation of substances in their standard state is zero

Now put all the given values in this expression, we get

$-14800=[(25\times -393.5)+(26\times -285.5)]-[(38\times 0)+(1\times \Delta H_{C_{25}H_{52}})]$

$\Delta H_{C_{25}H_{52}}=-2460.5kJ/mol$

Therefore, the molar enthalpy of formation for paraffin wax is -2460.5 kJ

3 0

2 years ago