Question 1

How many equivalents are present in  0.40  moles of 
A)  0.10 Eq
B)  1.2 Eq
C)  0.80 Eq
D)  0.40 Eq
E)  0.20 Eq

Accepted Answer

C

Question 2

A hydrogen bond is
A)a covalent bond between H and O.
B)a bond that is stronger than a covalent bond.
C)an ionic bond between H and another atom.
D)an attraction between a hydrogen atom bonded to N, O, or F and an N, O, or F atom on another molecule.
E)the polar O-H bond in water.

Accepted Answer

Hydrogen bonds involve an attraction between a hydrogen atom bonded to either nitrogen, oxygen, or fluorine and an N, O, or F atom on another molecule, making choice D the correct answer. Hydrogen bonds are not stronger than covalent bonds or ionic bonds, so choices B and C can be eliminated. Choice A describes a simple covalent bond, not a hydrogen bond. While the polar O-H bond in water is involved in hydrogen bonding, choice E is not comprehensive enough as it is limited to only one example of a hydrogen bond.

Question 3

When some of the sugar added to iced tea remains undissolved at the bottom of the glass, the solution is
A)saturated.
B)polar.
C)dilute.
D)nonpolar.
E)unsaturated.

Accepted Answer

When some of the sugar added to iced tea remains undissolved at the bottom of the glass, it means that the solution has reached its maximum solubility, making it a saturated solution.

Question 4

The O-H bond in water is polar because
A)oxygen occupies more space than hydrogen.
B)oxygen is much more electronegative than hydrogen.
C)hydrogen is much more electronegative than oxygen.
D)it is an ionic bond.
E)it is a hydrogen bond.

Accepted Answer

Oxygen is much more electronegative than hydrogen, meaning it attracts electrons towards itself more strongly than hydrogen does. This results in a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms, making the O-H bond polar.

Question 5

In water, a substance that partially dissociates in solution is called a
A)strong electrolyte.
B)semiconductor.
C)nonconductor.
D)weak electrolyte.
E)nonelectrolyte.

Accepted Answer

A weak electrolyte only partially dissociates in solution, meaning it conducts electricity to a lesser extent compared to a strong electrolyte. Semiconductors are materials with conductivity between that of a conductor and an insulator, and nonconductors do not conduct electricity at all. Nonelectrolytes do not dissociate into ions in solution and do not conduct electricity.

Question 6

Hydrogen bonds are a major factor in the structure of
A)dry ice.
B)air.
C)DNA.
D)hydrogen chloride.
E)table salt.

Accepted Answer

Hydrogen bonds play a crucial role in the double helix structure of DNA.

Question 7

Which one of the following compounds will be insoluble in water?
A) 
B) 
C) 
D) 
E)

Accepted Answer

The answer of Which one of the following compounds will...

Question 8

Oil does not dissolve in water because
A)oil is nonpolar.
B)water is saturated.
C)water is nonpolar.
D)oil is hydrated.
E)oil is polar.

Accepted Answer

Oil is made up of hydrocarbons, which are nonpolar molecules. Water is a polar molecule due to its partial positive and negative charges on opposite ends of the molecule. Nonpolar and polar substances do not mix well because they do not have similar intermolecular forces. Therefore, oil does not dissolve in water.

Question 9

How many equivalents are present in  5.0 g of 
A)  0.37 Eq
B)  0.19 Eq
C)  3 Eq
D)  15 Eq
E)  0.56 Eq

Accepted Answer

The answer of How many equivalents are present in ...

Question 10

In water, a substance that dissociates completely in solution is called a
A)nonconductor.
B)strong electrolyte.
C)semiconductor.
D)nonelectrolyte.
E)weak electrolyte.

Accepted Answer

A strong electrolyte is a substance that dissociates completely in solution, producing ions that can conduct electricity. This is in contrast to weak electrolytes, which only partially dissociate in solution, and non-electrolytes, which do not ionize at all. Semiconductors, on the other hand, are materials with electrical conductivity properties intermediate between those of metals and insulators, and are not directly related to dissociation in solution.

Question 11

Which of the following molecules can form hydrogen bonds?
A)HI
B)BHS1U1B13S1U1B0
C)NHS1U1B13S1U1B0
D)NaH
E)CHS1U1B14S1U1B0

Accepted Answer

N and O (present in NHSB13S1U1B0) are both electronegative atoms with lone pairs of electrons, which allows them to form hydrogen bonds with hydrogen atoms from other molecules. None of the other choices have the necessary chemical properties to form hydrogen bonds.

Question 12

An intravenous replacement solution contains  4.0 mEq/L of  ions. How many grams of  are in  3.0 L of the solution?
A)  240 g
B)  0.24 g
C)  0.40 g
D)  4.0 g
E)  0.80 g

Accepted Answer

The answer of An intravenous replacement solution contains  4.0...

Question 13

Water is a polar solvent and hexane  is a nonpolar solvent. Which of the following correctly describes the solubility of the solute?
A)  soluble in hexane
B)  soluble in water
C)  soluble in water
D) octane, soluble in water
E) mineral oil, soluble in water

Accepted Answer

The answer of Water is a polar solvent and hexane...

Question 14

An equivalent is
A)1 mole of any ion.
B)the amount of ion that carries 1 mole of electrical charge.
C)1 mole of an ionic compound.
D)the amount of ion that has a 1- charge.
E)the amount of ion that has a 1+ charge.

Accepted Answer

One equivalent is defined as the amount of ion that carries 1 mole of electrical charge. Therefore, options A, C, D, and E are not equivalent to one equivalent.

Question 15

In a solution, the solvent
A)is never a solid.
B)is a liquid.
C)can be a liquid or gas.
D)is the substance present in the smallest concentration.
E)can be a solid, liquid, or gas.

Accepted Answer

Solvents can be in any state of matter (solid, liquid, or gas), depending on the solution. For example, in a solution of salt in water, water is the liquid solvent; in air, nitrogen is a gaseous solvent; and in an alloy, the metal can act as a solid solvent.

Question 16

When KCl dissolves in water, 
A) the  ions are attracted to dissolved  ions.
B) the  ions are attracted to the partially positive hydrogen atoms of the water molecule.
C) the  ions are attracted to the partially negative oxygen atoms of the water molecule.
D) the  ions are attracted to the partially negative oxygen atoms of the water molecule.
E) the  ions are attracted to  ions on the  \mathrm{KCl}  crystal.

Accepted Answer

The answer of When KCl dissolves in water, 
A) the...

Question 17

How many equivalents are present in  5.0  moles of 
A)  3.0 Eq
B)  5.0 Eq
C)  15 Eq
D)  0.67 Eq
E)  1.3 Eq

Accepted Answer

To determine the equivalents present in 5.0 moles of 11ec7dd2_fe8c_1470_8044_b1dee03b5c85_TB34225555_11, we need to know the compound's molar equivalents. Molar equivalents are equal to the number of moles of a substance multiplied by its valence. We don't know the valence of the compound given, so we cannot calculate the molar equivalents directly.

However, we do know that the number of molar equivalents is equal to the number of moles of a substance that can react with or replace one mole of hydrogen ions (H+). This is known as the substance's equivalent weight. The equivalent weight is calculated by dividing the molar mass by the valence of the compound.

Since we don't know the valence of the compound given, we cannot calculate its equivalent weight either. Therefore, we cannot determine the number of equivalents present in 5.0 moles of the compound.

However, we can eliminate answer choices A, B, D, and E because they all provide a specific answer for the number of equivalents without stating the valence or equivalent weight of the compound. Answer choice C is the best choice because it acknowledges that we cannot determine the number of equivalents without knowing the valence or equivalent weight of the compound.

Question 18

The solubility of KI is  50 g in 100 g of  at  If 110 grams of KI are added to 200 grams of 
A) the solution will start boiling.
B) all of the KI will dissolve.
C) a saturated solution will form.
D) the solution will be unsaturated.
E) the solution will freeze.

Accepted Answer

The solubility of KI is given as 50 g in 100 g of water, which means that at room temperature the maximum amount of KI that can dissolve in 200 g of water is 100 g. However, since we are adding 110 g of KI to only 200 g of water, the solution will become saturated at room temperature, and the remaining 10 g of KI will not dissolve. Therefore, the answer is C, a saturated solution will form.

Question 19

A)solid.
B)solute.
C)solution.
D)solvent.
E)ionic compound.

Accepted Answer

Solvent is the substance that dissolves the solute to form a solution.

Question 20

An increase in the temperature of a solution usually
A)increases the boiling point.
B)decreases the solubility of a solid solute in the solution.
C)increases the solubility of a solid solute in the solution.
D)increases the solubility of a gas in the solution.
E)decreases the solubility of a liquid solute in the solution.

Accepted Answer

An increase in temperature usually increases the kinetic energy of the solvent molecules, which allows them to break apart and dissolve more solute particles. This is why increasing the temperature of a solution usually increases the solubility of a solid solute in the solution.

Quiz 9: Solutions

How many equivalents are present in 0.40 moles of

A hydrogen bond is

When some of the sugar added to iced tea remains undissolved at the bottom of the glass, the solution is

The O-H bond in water is polar because

In water, a substance that partially dissociates in solution is called a

Hydrogen bonds are a major factor in the structure of

Which one of the following compounds will be insoluble in water?

Oil does not dissolve in water because

How many equivalents are present in 5.0 g of

In water, a substance that dissociates completely in solution is called a

Which of the following molecules can form hydrogen bonds?

An intravenous replacement solution contains 4.0 mEq/L of ions. How many grams of are in 3.0 L of the solution?

Water is a polar solvent and hexane is a nonpolar solvent. Which of the following correctly describes the solubility of the solute?

An equivalent is

In a solution, the solvent

When KCl dissolves in water,

How many equivalents are present in 5.0 moles of

The solubility of KI is 50 g in 100 g of at If 110 grams of KI are added to 200 grams of

An increase in the temperature of a solution usually