All categories

3 years ago

An element Y has 13 protons . with reference on Y answer these questions •

Chemistry

1 answer:

kobusy [5.1K]3 years ago

7 0

Explanation:

Y has 13 protons and we know that Aluminium (Al) too has 13 protons.

So , element Y = Aluminium

• In an element , no. of protons = no. of electrons. So , Y has 13 electrons.

• Mass no. of Y (Aluminium) = 27.

• Also we know that ,

Mass number = no. of protons + no. of neutrons

So,

No. of neutrons = 27 - 13 = 14

• Valence electrons are the electrons which are present in the outermost shell of an element.

Electronic Configuration of Y = 2,8,3

So, Y has 3 valence electrons.

• We know that Y is Aluminium & Aluminium is a metal. So , Y is a metal.

• Valency of Y = +3

You might be interested in

What is the molarity of a solution containing 8.0 moles of solute in a 569 ml of solution?

Ainat [17]

Answer:

14.06 M

Explanation:

Molarity: moles of a solution / liters of a solution

We convert 569ml into liters for the equation by dividing milliliters by 1000.

569/1000 = 0.569L

Now that we have Liters we can do moles of a solution / liters of a solution:

8 / 0.569 = 14.06 M

4 0

3 years ago

The shorter an elecrtomagnetic waves wavelength, the ___

grandymaker [24]

<h3>Answer:</h3>

The higher is its frequency.

<h3>Explanation:</h3>

Electromagnetic waves are types of waves that do not require a material medium for transmission.
They include radio waves, microwaves, infra-red and gamma rays among others.
Frequency refers to the number of complete oscillations in one second while wavelength is the distance between two successive crests or trough in a transverse wave.
The frequency of electromagnetic waves varies inversely to the wavelength.
Electromagnetic waves with higher frequencies such as x-rays and gamma rays have lower wavelengths.
Those with higher wavelengths, on the other hand, such as microwaves and radio waves have lower frequencies.

7 0

3 years ago

7. A solution containing 90grams of KNO3 per 100. grams of H2O at

Tomtit [17]

Answer:

(4) concentrated and supersaturated

Explanation:

At 50.°C, 90g of KNO3 lies above the solubility curve [on the Regents Reference Table G]. This indicates that the solution is supersaturated, meaning it contains more solute than will naturally dissolve, and was formed when a saturated solution cooled. Furthermore, the percent concentration of this solution is 90% KNO3 making this solution concentrated. This can be calculated using the formula for mass percent concentration.

Percent Mass = <u>Mass of Solute (g)</u> x 100

Mass of Solution (g)

5 0

3 years ago

A NaOH solution is standardized using the monoprotic primary standard potassium hydrogen phthalate, KHP (204.22 g/mol.) If 0.698

kakasveta [241]

Answer:

0.07789 M is the sodium hydroxide concentration.

Explanation:

Mass of potassium hydrogen phthalate = 0.6986 g

Molar mass of potassium hydrogen phthalate = 204.22 g/mol

Moles of potassium hydrogen phthalate = $\frac{0.6986 g}{204.22 g/mol}=0.003421 mol$

$NaOH+KHP\rightarrow NaKP+H_2O$

According to reaction , 1 mole og KHp reactswith 1 mole of NaOH , then 0.003421 moles of KHp will react with :

$\frac{1}{1}\times 0.003421 mol=0.003421 mol$

Moles of NaOH = 0.003421 mole

Volume of NaOH solution = 43.92 ml = 0.04392 L ( 1 mL = 0.001L)

$Concentration=\frac{Moles}{Volume(L)}$

Concentration of NaOH :

$\frac{0.003421 mol}{0.04392 L}=0.07789 M$

0.07789 M is the sodium hydroxide concentration.

5 0

3 years ago

What is another name for a condensation reaction? what is another name for a condensation reaction? water formation catabolism d

gregori [183]

Condensation is a chemical reaction in which two molecules are combined together and as a product formed a large molecule. There is also loss of small molecules in the condensation reaction. And mostly the functional groups combined in the reaction.
The other name for a condensation reaction is dehydration. As there is loss of molecule in condensation reaction, when that molecule is water it is said to be dehydration.

3 0

4 years ago

Read 2 more answers