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Alex777 [14]
3 years ago
6

Part A Which of the following groups comprise the s-block of elements? View Available Hint(s) A) groups 3-12 B) group 18 C) grou

ps 13-18 D)groups 1 and 2 ​
Chemistry
1 answer:
Yakvenalex [24]3 years ago
7 0

Answer:

D)groups 1 and 2 ​

Explanation:

The s-block of elements are made up of those chemical elements we can find in groups 1 and 2 on the periodic table.

A periodic table of element is based on the periodic law which states that "the properties of elements are a periodic function of their atomic number".

In the table;

  • elements having the same number of electrons in the outermost shell are placed over one another in vertical columns.
  • each resulting vertical column is called a group or family.
  • resulting horizontal rows are known as periods.  

The s-block consists of elements in groups 1 and 2 having an outermost ""ns"" shell configuration. They are predominantly metals.

For Option A, groups 3-12 is the D-block

Option B, group 18 is filled with noble gases and it makes up the p-block

Option C, group 13-18 is makes up the p-block too.

So, the s-block is made up group 1 and 2 elements.

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What is the molarity of a solution prepared by dissolving 8 grams of BaCl2 in enough water to make a 450. 0 mL solution? (Hint:
Salsk061 [2.6K]

Molarity is the molar concentration of the solute dissolved in a volume of a solution. The molarity of the solution prepared by dissolving barium chloride will be 0.085 M.

<h3>What is molarity?</h3>

Molarity is the ratio of the moles of the solute to that of the volume of the solution in Liters. It can be given as,

\rm Molarity = \dfrac{moles}{Volume}

Here, moles of the barium chloride can be given by the mass and the molar mass and volume is given as 0.450 L.

Substituting values in the equation:

\begin{aligned}\rm Molarity &= \rm \dfrac{mass}{Molar \;mass\times Volume}\\\\&= \dfrac{8}{208.23\times 0.450}\\\\&= 0.085\;\rm M\end{aligned}

Therefore, 0.085 M barium chloride is the molar concentration.

Learn more about molarity here:

brainly.com/question/26873446

4 0
2 years ago
Determine the LIMITING reactant in the following balanced equation:
padilas [110]

Answer:

KBr is limiting reactant.

Explanation:

Given data:

Mass of  KBr =4g

Mass of Cl₂ = 6 g

Limiting reactant = ?

Solution:

Chemical equation:

2KBr + Cl₂      →    2KCl + Br₂

Number of moles of KBr:

Number of moles = mass/molar mass

Number of moles = 4 g/ 119 gmol

Number of moles = 0.03 mol

Number of moles of Cl₂:

Number of moles = mass/molar mass

Number of moles = 6 g/ 70 gmol

Number of moles = 0.09 mol

Now we will compare the moles of reactant with product.

              KBr            :            KCl

                2              :              2

            0.03            :            0.03

             KBr            :              Br₂

                2             :               1

             0.03           :          1/2×0.03= 0.015

               Cl₂             :            KCl

                 1              :              2

            0.09            :           2/1×0.09 = 0.18

               Cl₂             :              Br₂

                1              :               1

             0.09           :            0.09

Less number of moles of product are formed by the KBr thus it will act as limiting reactant while Cl₂  is present in excess.

5 0
3 years ago
A species of rabbit lives in a grassland ecosystem. Rabbits of this species have brown fur that allows them to blend in with the
Vikentia [17]

Answer: c

Explanation:

The fur of the rabbit species changes over time from brown to white which helps them to blend with the environment.

5 0
3 years ago
Is brass a heterogeneous or homogeneous mixture ??????
Lynna [10]

Answer:

Brass is a homogenous mixture of copper and zinc

Hope it helped u, plz put thanks

4 0
3 years ago
Read 2 more answers
1.What is the specific heat capacity of granite when 20 kg absorbs 237 000 J of heat energy, causing its temperature to increase
Natalka [10]

<u>Given</u> :

  • Amount = 20 kg
  • Heat energy absorbed = 237,000 J
  • Temperature change = 15 °C

<u>Formula applied</u> :

\boxed {Q = mc \triangle T}

  • Q = absorbed heat
  • m = mass
  • c = specific heat capacity
  • ΔT = temperature change

Let's solve for c !

⇒ 237,000 = 20 × c × 15

⇒ c = 237,000 ÷ 300

⇒ \boxed {c = 790 J kg^{-1} K^{-1}}

∴ The specific heat capacity of granite is <u>790 J kg⁻¹ K⁻¹</u>.

5 0
2 years ago
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