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Sphinxa [80]
3 years ago
8

Which of the following statements is FALSE?A) Anions are usually larger than their corresponding atom.B) Metals tend to form cat

ions.C) Atoms are usually larger than their corresponding cation.D) The halogens tend to form 1+ ions.E) Nonmetals tend to gain electrons.
Chemistry
2 answers:
Elza [17]3 years ago
5 0

Answer:

The correct answer is option D) The halogens tend to form 1+ ions.

Explanation:

Hello!

Let's solve this!

We will analyze each of the options:

A) Anions are usually larger than their corresponding atom: it is correct because when the atom has more electrons, and it is an anion, it increases its size more.

B) Metals tend to form cations: it is correct, because metals tend to yield their electrons by charging positively and therefore, form cations.

C) Atoms are usually larger than their corresponding cation: it is correct since cations are the ions that have lost electrons, thus decreasing their size.

D) The halogens tend to form 1+ ions: it is not correct, since halogens form 1- ions, they form anions, since they are nonmetals.

E) Nonmetals tend to gain electrons: it is correct since nonmetals tend to accept electrons and form anions.

After the analysis we conclude that the correct answer is option D) The halogens tend to form 1+ ions.

jonny [76]3 years ago
4 0

Answer:

D) The halogens tend to form 1+ ions.

Explanation:

A) Is correct because the atom gains an electron

B) Is correct because metals tends to lose electrons

C) Is correct because the atom loses an electron

D) Is incorrect because the halogens tends to gain electrones (1-)

E) Is correct because Nonmetals tend to form anions

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(3) NaNO₃

Step-by-step explanation:

Sodium nitrate has ionic bonds, because it consists of Na⁺ and NO₃⁻ ions.

However, the nitrate ions have <em>covalent bonds</em> between the O atoms and the central N atoms.

(1) and (2) are <em>wrong</em>. Both N₂O₅ and HCl consist of nonmetals, so they are <em>covalent</em> compounds.

(4) is <em>wrong</em>. NaCl has <em>only ionic bonds</em> between the Na⁺ and Cl⁻ ions

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Which of the following are cations? Check all that apply.
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a

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b

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e

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The two different types of color are primary light colors and primary pigment colors. True or false
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Hard water often contains dissolved Ca2+ and Mg2+ ions. One way to soften water is to add phosphates. The phosphate ion forms in
avanturin [10]
<span>5.5×10−2M in calcium chloride and 8.0×10−2M in magnesium nitrate.
What mass of sodium phosphate must be added to 1.5L of this solution to completely eliminate the hard water ion

1) Content of Ca (2+) ions

Calcium chloride = CaCl2

Ionization equation: CaCl2 ---> Ca (2+) + 2 Cl (-)

=> Molar ratios: 1 mol of CaCl2 : 1 mol Ca(2+) : 2 mol Cl(-)

Calculate the number of moles of CaCl2 in 1.5 liters of 5.5 * 10^-2 M solution

M = n / V => n = M*V = 5.5 * 10^ -2 M * 1.5 l = 0.0825 mol CaCl2

=> 0.0825 mol Ca(2+)

2) Number of phosphate ions needed to react with 0.0825 mol Ca(2+)

formula of phospahte ion: PO4 (3-)

molar ratio: 2PO4(3-) + 3Ca(2+) = Ca3 (PO4)2

Proportion: 2 mol PO4(3-) / 3 mol Ca(2+) = x / 0.0825 mol Ca(2+)

=> x = 0.0825 coml Ca(2+) * 2 mol PO4(3-) / 3 mol Ca(2+) = 0.055 mol PO4(3-)

3) Content of Mg(2+) ions

Ionization equation: Mg (NO3)2 ----> Mg(2+) + 2 NO3 (-)

Molar ratios: 1 mol Mg(NO3)2 : 1 mol Mg(2+) + 2 mol NO3(-)

number of moles of Mg(NO3)2 in 1.5 liter of 8.0 * 10^-2 M solution

n = M * V = 8.0 * 10^ -2 M * 1.5 liter = 0.12 moles Mg(NO3)2

ions of Mg(2+) = 0.12 mol Mg(NO3)2 * 1 mol Mg(2+) / mol Mg(NO3)2 = 0.12 mol Mg(2+)

4) Number of phosphate ions needed to react with 0.12 mol Mg(2+)

2PO4(3-) + 3Mg(2+) = Mg3(PO4)2

=> 2 mol PO4(3-) / 3 mol Mg(2+) = x / 0.12 mol Mg(2+)

=> x = 0.12 * 2/3 mol PO4(3-) = 0.16 mol PO4(3-)

5) Total number of moles of PO4(3-)

0.055 mol + 0.16 mol = 0.215 mol

6) Sodium phosphate

Sodium phosphate = Na3(PO4)

Na3PO4 ---> 3Na(+) + PO4(3-)

=> 1 mol Na3PO4 : 1 mol PO4(3-)

=> 0.215 mol PO4(3-) : 0.215 mol Na3PO4

mass in grams = number of moles * molar mass

molar mass of Na3 PO4 = 3*23 g/mol + 31 g/mol + 4*16 g/mol = 164 g/mol

=> mass in grams = 0.215 mol * 164 g/mol = 35.26 g

Answer: 35.26 g of sodium phosphate
</span>
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4 years ago
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