Which of the following statements is true about a mole in chemistry?

A mole contains Avogadro's number of particles, which is 6.022×10 23 atoms

A mole represents the number of particles in a gram of a substance.

A mole is only used to measure gases.

A mole refers to the mass of a molecule in grams.

A buffer is a solution that

resists a change in pH and preserves the structure and function of molecules in that solution

decreases the pH and alters the physical structure and function of molecules in that solution

alters the pH of a reaction but maintains the structure and function of molecules.

increases the pH and alters the function of molecules

When preparing a buffer, why is water added in two stages?

So there is room to add acid or base for pH adjustment without going over final volume.

Water is not added in two stages, but in one stage to final desired volume

So there is room to add more solute for pH adjustment without going over final volume.

To avoid spikes in acid or alkaline levels.

Determine the mass of NaH 2 PO 4 • H 2 O and Na 2 HPO 4 needed to make 2L of 1.9mM NaH 2 PO 4 • H 2 O, 9.1mM Na 2 HPO 4 , pH7.35 buffer solution? NaH 2 PO 4 • H 2 O Molecular Weight = 137.99g/mol Na 2 HPO 4 Molecular Weight = 141.98g/mol

0.52g NaH 2 PO 4 • H 2 O and 2.58g Na 2 HPO 4

5.24g NaH 2 PO 4 • H 2 O and 25.84g Na 2 HPO 4

52.44g NaH 2 PO 4 • H 2 O and 25.84g Na 2 HPO 4

52.44g NaH 2 PO 4 • H 2 O and 258.44g Na 2 HPO 4

What is the significance of water ionization in its ability to act as a solvent?

It splits into ions, allowing it to interact with charged solutes.

It becomes electrically neutral in all solutions.

It forms covalent bonds with nonpolar molecules.

It forms ionic bonds with solutes.

What components make up a typical buffer solution?

Weak acid and its conjugate base

What happens when small amounts of H+ or OH- are added to a buffer solution?

The H+ or OH- ions are neutralized by the buffer components.

Water molecules become H 2 CO 3 .

The buffer stops ionizing completely.

How does a buffer prevent a decrease in pH when carbonic acid (H2CO3) is introduced?

The conjugate base (A-) binds to the released H+ ions, removing them from the solution.

The water molecules ionize to produce additional H+ ions.

The carbonic acid absorbs hydroxide ions to neutralize the solution.

The buffer adds more water molecules to dilute the acid.

In the titration of NaOH with HCl, what does the equation M1V1 = M2V2 allow you to calculate?

The concentration of NaOH based on the volume of HCl used

The concentration of HCl using the volume and concentration of NaOH

The volume of NaOH needed to neutralize a given amount of HCl

The amount of NaOH required to neutralize water

biotech unit 3

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biotech unit 3

36 questions

convert to standard notation 2.555x10^2

convert to standard notation 1.54x10^-1

Convert the following units to the requested unit:
235.1µL = _____mL

Convert the following units to the requested unit:
1.7L = ______mL

Write the answer in appropriate significant figures
18.01 x 2.23 x 14.8

Determine the number of significant figures.
3.5 x 10³

Write the answer in appropriate significant figures
12306 x 2451

Write the answer in appropriate significant figures
64 / 20

1897µl = _____ mL

Convert
7800ml = _____µl

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biotech unit 3

36 questions

convert to standard notation 2.555x10^2

convert to standard notation 1.54x10^-1

Convert the following units to the requested unit: 235.1µL = _____mL

Convert the following units to the requested unit: 1.7L = ______mL

Write the answer in appropriate significant figures18.01 x 2.23 x 14.8

Determine the number of significant figures. 3.5 x 103

Write the answer in appropriate significant figures12306 x 2451

Write the answer in appropriate significant figures64 / 20

1897µl = _____ mL

Convert 7800ml = _____µl

Access all questions and much more by creating a free account

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Convert the following units to the requested unit:
235.1µL = _____mL

Convert the following units to the requested unit:
1.7L = ______mL

Write the answer in appropriate significant figures
18.01 x 2.23 x 14.8

Determine the number of significant figures.
3.5 x 10³

Write the answer in appropriate significant figures
12306 x 2451

Write the answer in appropriate significant figures
64 / 20

Convert
7800ml = _____µl