Help plz I rly. Need it

For which of the following elements would the most common ion be expected to have a larger radius than that of its corresponding

Andre45 [30]

Answer: The ion that is expected to have a larger radius than the corresponding atom is chlorine.

Explanation:

There are two types of ions:

Cations: They are formed when an atom looses its valence electrons. They are positive ions.
Anions: They are formed when an atom gain electrons in its outermost shell. They are negative ions.

For positive ions, the removal of electron increases the nuclear charge for an outermost electron because the outermost electrons are more strongly attracted by the nucleus. So, the effective nuclear charge increases for cations and thus, the size of the cation will be smaller than that of the corresponding atom.

For negative ions, the addition of electron decreases the nuclear charge for an outermost electron because the outermost electrons are less strongly attracted by the nucleus. So, the effective nuclear charge decreases for anions and thus, the size of the anion will be larger than that of the corresponding atom.

For the given options:

Option a: Chlorine

Chlorine gains 1 electron and form $Cl^-$ ion

Option b: Sodium

Sodium looses 1 electron and form $Na^+$ ion

Option c: Copper

Copper looses 2 electrons and form $Cu^{2+}$ ion

Option d: Strontium

Strontium looses 2 electrons and form $Sr^{2+}$ ion

Hence, the ion that is expected to have a larger radius than the corresponding atom is chlorine.

8 0

3 years ago

How many kilojoules of heat will be released when exactly 1 mole of iron, Fe, is burned to form Fe2O3 at standard state condaiti

Diano4ka-milaya [45]

Answer:

412.1kJ

Explanation:

For the reaction , from the question -

4Fe (s) + 3O₂ (g) → 2Fe₂O₃ (s)

Δ Hrxn = Δ H°f (products) - Δ H°f (reactants)

In case the compound is in its standard state , enthalphy of formation is zero

Hence ,

for the above reaction ,

ΔHrxn =( 2 * Δ H° (Fe₂O₃ )) - [ ( 4 *Δ H° Fe ) + (3 * Δ H° O₂ )]

The value for Δ H°(Fe₂O₃ ) = - 824.2kJ/mol

Δ H° Fe = 0

Δ H° O₂ = 0

Putting in the above equation ,

ΔH rxn = ( 2 * Δ H° (Fe₂O₃ )) - 0

ΔHrxn = 2× - 824.2 kJ / mol = - 1648.4 kJ/mol

- 1648.4 kJ/mol , this much heat is released by the buring of 4 mol of Fe.

Hence ,

for 1 mol of Fe ,

- 1648.4 kJ/mol / 4 = 412.1kJ

8 0

3 years ago

Tetrabromoethane with zinc

Fantom [35]

The answer of the the reaction between tetrabromoethane and zinc is the image below. Acetylene and two zinc bromide are formed

7 0

3 years ago

BEEN STUCK ON THIS FOR THREE HOURS. GIVING 50 POINTS TO ANYONE WHO SOLVES!

Arturiano [62]

Answer:

1: 38

2: 39

3: 40

4: 41

Explanation:

The mass in amu is the weight of the neutrons and protons in the element. The mass number is the number neutrons and protons you have in an element. Both neutrons and protons have a weight of 1 amu. Since you can't have a decimal of a subatomic particle, you have to round to the nearest whole number.

4 0

3 years ago

Please help due tonight

andre [41]

Answer:

, CaCO3, contains one atom of calcium, one of carbon and three of oxygen. so there are 5 atoms in CaCO3

Mg(OH)2, There is one magnesium, two oxygen, and two hydrogen atoms. so there are 5 atoms Mg(OH)2

a molecule of acetic acid contains two carbon atoms, four hydrogen atoms, and two oxygen atoms. so there are 8 atoms in acetic acid

There are 3 atoms in CaCl2

H2SO4 is a chemical compound made up of two hydrogen atom, one sulfer atom, and four oxygen atoms. So there are 7 atoms in H2SO4

There are 8 atoms in sodium phosphate

Explanation:

5 0

3 years ago