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3 years ago

Which group on the Periodic Table has at least

2 answers:

5 0

The correct option is GROUP 17.
The group 17 of the periodic table is made up of halogens. Halogens is the family name for fluorine, chlorine, bromine, iodine and all the other elements that are found in group 17. Some of the elements in this group are gases, some are liquids while others are solids.

PilotLPTM [1.2K]3 years ago

5 0

The group that has at least one element in each of the three phases of matter at STP is $\boxed{\left( 3 \right){\text{ }}17}$ .

Further Explanation:

The systematic arrangement of various elements in the increasing order of their atomic numbers is termed as the periodic table. It exists in the form of a table, comprising of horizontal rows called periods and vertical columns called groups. There are 18 groups and 7 periods in a periodic table.

(1) Group 1 includes lithium, sodium, potassium, rubidium, cesium and francium. All of these elements are solids. So group 1 elements exist in only one phase of matter.

(2) Group 2 includes beryllium, magnesium, calcium, strontium, barium, and radium. All of these elements are solids. So group 2 elements exist in only one phase of matter.

(3) Group 17 includes fluorine, chlorine, bromine, iodine, and astatine. Out of these elements, F and Cl are gases, bromine is a liquid and iodine and astatine are solids at STP. So the elements of group 17 exist in different phases of matter.

(4) Group 18 includes helium, neon, argon, krypton, xenon, and radon. These are called noble gases as these are chemically inert. All the group 18 elements are gases in nature. So group 18 elements exist in only one phase of matter.

Learn more:

Which general statement does not apply to metals? brainly.com/question/2474874
Among sodium and chlorine, which has higher ionization energy? brainly.com/question/6324347

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Periodic classification of elements

Keywords: elements, group 1, group 2, group 18, group 17, solid, liquid, gas, phases of matter.

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The equation for another reaction used in industry isCO(g) + H₂O(g) <img src="https://tex.z-dn.net/?f=%5Crightleftharpoons" id="

Sloan [31]

Answer:

(i) CO = 0.4 mol; H₂O = 1.6 mol; Kc = 4

(ii) CO = 0.67 mol; H₂O = 0.67 mol; CO₂ = 1.33 mol; H₂ = 1.33 mol

Explanation:

(i) For the equation given let's make a table of the concentrations for equilibrium (the volume is constant, so, we can do it with moles number)

CO(g) + H₂O(g) ⇄ H₂(g) + CO₂(g)

2.0 mol 3.2 mol 0 0 Initial

-x -x +x +x Reacts (stoichiometry is 1: 1: 1: 1)

2.0-x 3.2-x x x Equilibrium

In the equilibrum, the moles number of hydrogen and carbon dioxide are 1.6 mol, so x = 1.6 mol

The amounts of CO and H₂O are:

CO = 2.0 - 1.6 = 0.4 mol

H₂O = 3.2 - 1.6 = 1.6 mol

The constant of the equilibrium is the multiplications of the concentrations of products divided by the multiplication of the concentration of the reactants (all the concentrations elevated to the coefficient). So:

Kc = (1.6x1.6)/(0.4x1.6)

Kc = 1.6/0.4

Kc = 4

(ii) Kc must remais constant (it only changes with the temperature), so let's construct a new table of equilibrium:

CO(g) + H₂O(g) ⇄ H₂(g) + CO₂(g)

2.0 mol 2.0 mol 0 0 Initial

-x -x +x +x Reacts (stoichiometry is 1: 1: 1: 1)

2.0-x 2.0-x x x Equilibrium

Kc = (x*x)/((2.0-x)*(2.0-x))

4 = x²/(4 - 4x + x²)

16 - 16x + 4x² = x²

3x² - 16x + 16 = 0

Using Baskhara's equation:

Δ =(-16)² - 4x3x16

Δ = 256 - 192

Δ = 64

x = (-(-16) +/- √64)/(2*3)

x' = (16 + 8)/6 = 4

x'' = (16 - 8)/6 = 1.33

x must be small than 2.0, so x = 1.33 mol, which is the amount of hydrogen and carbon dioxide at equilibrium. The both reactants has 2.0 - 1.33 = 0.67 mol at equilibrium.

5 0

3 years ago

If I initially have 4.0 L of a gas at a pressure of 1.1 atm and a temperature of 298 K, what will the volume be if I increase th

DochEvi [55]

Answer:

1.34L

Explanation:

1 torr = 0.00132atm

P2= 2584torr = 3.41atm

T2= 37°C = 273+37 = 310K

Using combined gas law

P1V1/T1 = P2V2/T2

(1.1×4.0)/298 = (3.41 × V2)/310

V2= (1.1×4×310)/(298×3.41)

V2= 1.34L

4 0

3 years ago

WILL MARK BRAINIEST !!!!

natima [27]

Answer:

1. An encounter with the barrier

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Explanation:

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3 years ago

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Describe how nucleic acid basis pair up

castortr0y [4]

The rules of base pairing (or nucleotide pairing) are: A with T: the purine adenine (A) always pairs with the pyrimidine thymine (T) C with G: the pyrimidine cytosine (C) always pairs with the purine guanine (G)

The nucleotides in a base pair are complementary which means their shape allows them to bond together with hydrogen bonds. The A-T pair forms two hydrogen bonds. The C-G pair forms three. The hydrogen bonding between complementary bases holds the two strands of DNA together.

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3 years ago

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Elza [17]

Answer:

Achol

Explanation:

Reduction of other aldehydes gives primary alcohols. Reduction of ketones gives secondary alcohols. The acidic work-up converts an intermediate metal alkoxide salt into the desired alcohol via a simple acid base reaction.

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3 years ago