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3 years ago

How are the groups titled in the periodic table?

Chemistry

1 answer:

Vika [28.1K]3 years ago

6 0

By the number of Electrons in the valence shell if 1=group 1 if 2 its group 2 and so on Valence means outermost shell

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What is the concentration of OH− and pOH in a 0.00072 M solution of Ba(OH)2 at 25 ∘C? Assume complete dissociation.

Mumz [18]

Given :

0.00072 M solution of $Ba(OH)_2$ at $25^oC$ .

To Find :

The concentration of $OH^-$ and pOH .

Solution :

1 mole of $Ba(OH)_2$ gives 2 moles of $OH^-$ ions .

So , 0.00072 M mole of $Ba(OH)_2$ gives :

$[OH^-]=2 \times 0.00072\ M$

$[OH^-]=0.00144\ M$

$[OH^-]=1.44\times 10^{-3}\ M$

Now , pOH is given by :

$pOH=-log[OH^-]\\\\pOH=-log[1.44\times 10^{-3}]\\\\pOH=2.84$

Hence , this is the required solution .

3 0

3 years ago

An organic compound that contains only carbon and hydrogen and a triple bond (all the other bonds are single bonds) is classifie

Basile [38]

Answer:

c. alkyne.

Explanation:

Hello there!

In this case, according to the attached file, it turns out possible for us to say that alkanes have only single-bonded carbon atoms, alkenes have two double-bonded carbon atoms and alkynes have two triple-bonded carbon atoms.

In such a way, according to the aforementioned definition, we infer that that an organic compound that contains only carbon and hydrogen and a triple bond (all the other bonds are single bonds) is classified as c. alkyne.

Regards!

3 0

3 years ago

What type of reaction is: 4 Fe + 3 O2 → 2 Fe2O3

Dafna11 [192]

Answer:

A. synthesis

Explanation:

The reaction given is a synthesis reaction in which two substances combines to give a product.

In this reaction:

4Fe + 3O₂ → 2Fe₂O₃

The reaction involves the formation of a single product from two or more reactants.

The formation of a compound from union of the constituent elements also falls into this category of reaction.

3 0

3 years ago

A horse was 6,200 meters north of a barn. For 22.5 minutes, the horse ran toward the barn at 152 meters per minute. In that time

lutik1710 [3]

3420‬m

Explanation:

Given parameters:

Length of path = 6200m

time taken for the horse to run = 22.5min

speed = 152meters/minute

Unknown:

Distance run by the horse = ?

Solution:

Speed is the rate of change of distance with time.

Speed = $\frac{distance}{time}$

Distance = speed x time

Distance = 152 x 22.5 = 3420‬m

learn more:

Speed brainly.com/question/5424148

#learnwithBrainly

6 0

3 years ago

Which of the following causes the formation of ionic bonds

pantera1 [17]

Answer: b. One atom transferring electrons to another atom

Explanation: An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal.

Covalent bonds are formed by sharing of electrons between non metals

For example, In calcium iodide the one electron from calcium metal gets transferred to iodine atom and thus form an ionic bond to give $CaI_2$