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3 years ago

How can you describe the location of hafnium on the periodic table? Choose all that apply.

Chemistry

1 answer:

Marrrta [24]3 years ago

4 0

A and D is the correct answer for this question.

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In a chemical change

Vsevolod [243]

Answer:

B. materials change their properties.

Explanation:

In a chemical change, materials often change their properties because a re-arrangement of atoms takes place.

A chemical change is one in which new kind of matter is formed.

It is always accompanied by energy changes.

Chemical changes are not reversible.
They lead to the production of new kinds of matter
It involves mass changes
Requires considerable amount of energy

8 0

3 years ago

An electrically neutral atom bears what trait?

zhenek [66]

C) It contains the same number of electrons and protons.

4 0

3 years ago

If you burn yourself bt touching a hot stove ,it is an example of heat transfer by

ehidna [41]

Conduction is the act of touching 2 solids where one transfers heat

6 0

3 years ago

How long would it take to produce enough aluminum to make a case (24 cans) of aluminum soft drink cans if each can used 3 g of a

kozerog [31]

Answer : It takes time to produce 3 g of aluminium is, 165 seconds.

Explanation :

As we are given that the mass of aluminium is, 3 grams. Now we have to calculate the total mass of aluminum.

Total mass of aluminum = 3g × 24 = 72 g

Now we have to calculate the moles of aluminum.

$\text{Moles of Al}=\frac{\text{Mass of Al}}{\text{Molar mass of Al}}$

Molar mass of Al = 27 g/mol

$\text{Moles of Al}=\frac{72g}{27g/mol}=2.67mol$

As, 1 mole of Al has 3 Faradays

So, 2.67 mole of Al has = $2.67\times 3=80.1$ Faradays

and,

Charge = $80.1\text{ Faradays}\times \frac{96500\text{ coulombs}}{1\text{ Faradays}}=7.73\times 10^6\text{ coulombs}$

Current = $5.00\times 10^4A\times \frac{93.9}{100}=46950A$

Now we have to calculate the time.

$Time=\frac{Charge}{Current}=\frac{7.73\times 10^6}{46950}=164.6s\aaprox 165s$

Hence, it takes time to produce 3 g of aluminium is, 165 seconds.

5 0

3 years ago

According to Hund's rule, what's the expected magnetic behavior of vanadium (V)?

vodka [1.7K]

Answer:

C. paramagnetic.

Explanation:

1s2 2s2 2p6 3s2 3p6 4s2 3d3 It is Vanadium.

It has 3 unpaired d- electrons, so it is paramagnetic.

6 0

3 years ago