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4 years ago

7

4. Which statement is true about alkali metals?

2 answers:

Svet_ta [14]4 years ago

8 0

I think its most likely to be A,

Tasya [4]4 years ago

4 0

The correct answer is option A, that is, some of them explode when exposed to water.

The alkali metals refer to a group in the periodic table comprising the chemical elements sodium, lithium, rubidium, potassium, francium, and cesium. This group is situated in the s-block of the periodic table. The alkali metals are all soft, shiny, highly reactive metals at standard pressure and temperature, and easily lose their outermost electron to produce cations with charge +1.

The alkali metals are the most reactive metals found in the periodic table, they all react dynamically or some even explosively with cold water, leading to the displacement of hydrogen

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What kind of chemical bond holds each oxygen atom to the phosphorus atom

MAXImum [283]

This I believe would be double covalent bonds

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3 years ago

given that an aluminum ore contains 25% bauxite Al(OH)3, how much aluminum would a 200g sample of ore contain?

Olenka [21]

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6 0

3 years ago

What is the empirical formula of CoH1803? (4 points)

butalik [34]

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Explanation:

My Head Is About To Explode

7 0

3 years ago

Calculate the change in entropy when 1.00 kg of water at 100 ∘C is vaporized and converted to steam at 100 ∘C. Assume that the h

andrew11 [14]

Answer : The change in entropy is $6.05\times 10^3J/K$

Explanation :

Formula used :

$\Delta S=\frac{m\times L_v}{T}$

where,

$\Delta S$ = change in entropy = ?

m = mass of water = 1.00 kg

$L_v$ = heat of vaporization of water = $2256\times 10^3J/kg$

T = temperature = $100^oC=273+100=373K$

Now put all the given values in the above formula, we get:

$\Delta S=\frac{(1.00kg)\times (2256\times 10^3J/kg)}{373K}$

$\Delta S=6048.25J/K=6.05\times 10^3J/K$

Therefore, the change in entropy is $6.05\times 10^3J/K$

5 0

3 years ago

Without looking at the periodic table, identify the group, period, and

kobusy [5.1K]

the group : 2

periode : 6

block = 2

atomic number = 56

<h3>Further explanation </h3>

We can divide the periodic system into several parts:

1. Block s: groups 1 and 2 (having a configuration of 1s-7s) consist of active metals except for H (non-metals) and He (noble gases)

2. Block p: group 13-18 (has a 2p-6p configuration), also called a representative element because it includes metals, non-metals and metalloids

3. Block d: group 3-12 (having the 3d-6d configuration), are transition metal elements

4. Block f: Lanthanides and Actinides (having a 4f-5f configuration), are inner transition elements that are also metal

The element with the electron configuration : [Xe]6s²

The outer shell 6s² :

Electron configuration :

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s² : electron =56

group⇒valence electron ⇒2

period⇒the greatest value of the quantum number n⇒6

The element that is in period 6, and belongs to group 2 and has the atomic number 56 and in the block s

4 0

3 years ago