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3 years ago

11

Families 1-2 and 13-18 are called the...

1 answer:

Zolol [24]3 years ago

5 0

Answer:

C. representative elements.

Explanation:

Families 1 - 2 and 13 - 18 are called representative elements or often times, main group elements.

Elements on the periodic table belongs to four blocks which are s, p, d and f blocks.
Those in the s and p-blocks are the main group elements also called representative elements.
Their outer-shell are not completely filled with electrons but their inner shell is completely filled.

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3. How many moles of NaCl are present in 6000. La 1.5 M NaCl solution?

Leno4ka [110]

Answer:

Option A (9.0) is the correct alternative.

Explanation:

The given values are:

Molarity,

= 1.5 M

Volume,

= 6000 mL

or,

= 6 L

As we know,

⇒ $Molarity=\frac{Moles}{Volume}$

or,

⇒ $The \ moles \ of \ NaCl=Molarity\times Volume$

By putting the values, we get

$=1.5\times 6$

$=9 \ mol$

7 0

3 years ago

How many particles are there in 2.8 moles of CO2

Drupady [299]

Answer:

Moles = Molecules / (6.0221415 x 10^23)

Explanation:

3 0

3 years ago

Calculate the pH of a solution that is 0.235M benzoic acid and 0.130M sodium benzoate, a salt whose anion is the conjugate base

lesantik [10]

Hello!

We have the following data:

ps: we apply Ka in benzoic acid to the solution.

[acid] = 0.235 M (mol/L)

[salt] = 0.130 M (mol/L)

pKa (acetic acid buffer) =?

pH of a buffer =?

Let us first find pKa of benzoic acid, knowing that Ka (benzoic acid) = $6.20*10^{-5}$

So:

$pKa = - log\:(Ka)$

$pKa = - log\:(6.20*10^{-5})$

$pKa = 5 - log\:6.20$

$pKa = 5 - 0.79$

$\boxed{pKa = 4.21}$

Now, using the abovementioned data for the pH formula of a buffer solution or (Henderson-Hasselbalch equation), we have:

$pH = pKa + log\:\dfrac{[salt]}{[acid]}$

$pH = 4.21 + log\:\dfrac{0.130}{0.235}$

$pH = 4.21 + log\:0.55$

$pH = 4.21 + (-0.26)$

$pH = 4.21 - 0.26$

$\boxed{\boxed{pH = 3.95}}\end{array}}\qquad\checkmark$

Note:. The pH <7, then we have an acidic solution.

I Hope this helps, greetings ... DexteR! =)

8 0

3 years ago

Using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid

Umnica [9.8K]

Answer: Gas

Explanation: Because to check temperature of a room you use a gas in then room

5 0

3 years ago

What is light tell definition

swat32

Answer:

1..the natural agent that stimulates sight and makes things visible.

2.an expression in someone's eyes indicating a particular emotion or mood.

"a shrewd light entered his eyes"

8 0

2 years ago

Read 2 more answers