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3 years ago

A chemical reaction has two elements as reactants. Which type of reaction might occur?

Chemistry

2 answers:

pogonyaev3 years ago

7 0

Answer: The reaction is known as synthesis reaction.

Explanation:

Synthesis reaction is defined as the chemical reaction in which substances react in their elemental state to produce a single compound.

For Example: The formation of magnesium oxide from magnesium and oxygen gas.

$2Mg(s)+O_2(g)\rightarrow 2MgO(s)$

By Stoichiometry of the reaction:

2 moles of magnesium atom reacts with oxygen gas to produce 2 moles of magnesium oxide.

Hence, the reaction is known as synthesis reaction.

Elden [556K]3 years ago

3 0

That should be a synthesis reaction

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Predict the ground-state electron configuration of the following ions. Write your answers in abbreviated form, that is, beginnin

abruzzese [7]

These are three questions and three complete answers

Answer:

a) Cr²⁺: [Ar] 4s² 3d²

b) Cu²⁺: [Ar] 4s² 3d⁷

c) Co³⁺: [Ar] 4s² 3d⁴

Explanation:

a) Cr²⁺

Z = 24

Number of protons: 24

Number of elecrons of the neutral atom: 24

Charge of the ions: + 2

Number of electrons of the ion: 24 - charge = 24 - 2 = 22.

Electron configuration:

Fill the orbitals in increasing order of energy. Using Aufbau's rules the order is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ .....

Hence, for 22 electrons you get:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d²

Abbreviated notation: since the last complete level is the number 3s² 3p⁶, you use the noble gas of the period 3, which is Ar, and the configuration is:

[Ar] 4s² 3d²

b) Cu²⁺

Z = 29

Number of protons: 29

Number of elecrons of the neutral atom: 29

Charge of the ion: + 2

Number of electrons of the ion: 29 - charge = 29 - 2 = 27.

Electron configuration:

Fill the orbitals in increasing order of energy. Using Aufbau's rules the order is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ .....

Hence, for 27 electrons you get:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷

Abbreviated notation: since the last complete level is the number 3s² 3p⁶, you use the noble gas of the period 3, which is Ar, and the configuration is:

[Ar] 4s² 3d⁷

c) Co³⁺

Z = 27

Number of protons: 27

Number of elecrons of the neutral atom: 27

Charge of the ion: + 3

Number of electrons of the ion: 27 - charge = 27 - 3 = 24.

Electron configuration:

Fill the orbitals in increasing order of energy. Using Aufbau's rules the order is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ .....

Hence, for 24 electrons you get:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁴

Abbreviated notation: since the last complete level is the number 3s² 3p⁶, you use the noble gas of the period 3, which is Ar, and the configuration is:

[Ar] 4s² 3d⁴

6 0

4 years ago

What atomic nucleus has the fewest protons

maksim [4K]

Hydrogen-

Hydrogen is the answer because the number of protons is the atomic number. All the elements have different atomic numbers and hydrogen has the least with an atomic number of 1.

3 0

4 years ago

When 5.00 mol of benzene is vaporized at a constant pressure of 1.00 atm and at its normal boiling point of 80.1°C, 169.5 kJ are

NNADVOKAT [17]

Answer:

∆E=155kJ

Explanation:

Check attachment

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3 years ago

What are the threats to coral reefs

spayn [35]

No answer choices?

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4 years ago

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A 250.0 mL solution contains 4.6 g

CaHeK987 [17]

Answer:

THE MOLARITY OF THE SOLUTION IS 0.1368 mol/dm3

Explanation:

Molarity is the number of moles of the solute per litre of the solution.

It is expressed as;

Molarity in mol/dm3 = Molarity in g/dm3 / Relative molecular mass

Step 1: obtain the molarity in g/dm3

4.6 g of CuCl2 in 250 mL solution

4.6 / 250 * 10^-3

= 4.6 / 0.25

= 18.4 g/dm3 of CuCl2

Step 2: calculate the relative molecular mass of CuCl2

( Cu = 63.5 , Cl = 35.5)

RMM = 63.5 + 35.5 *2

= 63.5 + 71

= 134.5 g /mol

Step 3: Calcullate molarity in mol/dm3

Molarity in mol/dm3 = molarity in g/dm3 / RMM

= 18.4 g/dm3 / 134.5 g/mol

= 0.1368 mol/dm3

So therefore, the molarity of CuCl2 is 0.1368 mol/dm3

7 0

3 years ago