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Assoli18 [71]
4 years ago
14

An aqueous solution contains 0.30 M potassium fluoride.

Chemistry
1 answer:
Len [333]4 years ago
5 0

Answer:

A. 0.15 M NaOH, and

E. 0.15 M HNO3

Explanation:

A buffer solution contains a conjugate acid-base pair with both the acid and the base in reasonable concentrations.

NaOH and HNO3 is an acid base pair with relatively equal concentrations. So, they would most likely make a buffer solution.

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Which statement about concentration cells is correct?
Annette [7]

Answer:

The answer is D. The concentrations are different and the reactions are different, so the cell potential is 0.00 volts.

Explanation:

A concentration cell is an electrolytic cell that is comprised of two half-cells with the same electrodes, but differing in concentrations. A concentration cell acts to dilute the more concentrated solution and concentrate the more dilute solution, creating a voltage as the cell reaches an equilibrium.

7 0
3 years ago
Read 2 more answers
Density is the ratio of a sample's mass to its volume. A bar of lead has a mass of 115.2 g. When it is submerged in 25.0 mL of w
Margarita [4]

Answer:

$10.97 \ g/cm^3$

Explanation:

Given :

Mass of a bar of lead = 115.2 g

Initial water level $\text{in the graduated cylinder}$ = 25 mL

Final water level $\text{in the graduated cylinder}$ = 35.5 mL

Difference in the water level = 35.5 - 25

                                               = 10.5 mL

                                               = 10.5 \ cm^3

We know that when a body is submerged in water, it displaces its own volume of water.

Therefore, the volume of the lead bar = volume of the water displaced = 10.5 mL  = 10.5 \ cm^3

We know that mathematically, density is the ratio of mass of body to its volume.

Density of the lead bar is given by :

$\rho =\frac{\text{mass}}{\text{volume}}$

$\rho =\frac{\text{115.2 g}}{\text{10.5 cm}^3}$

  = $10.97 \ g/cm^3$

3 0
3 years ago
Why is it necessary to obtain 25 to 50 hairs from this woman?
Vedmedyk [2.9K]

To get the correct data

5 0
3 years ago
Which element has chemical properties that are most<br> similar to potassium, And why?
bekas [8.4K]

Answer:

Brainliest pls

Explanation:

The components potassium and sodium have comparable substance properties since they have a similar number of valence electrons

8 0
2 years ago
On the periodic table, gold has the atomic number 79. This means that
Troyanec [42]

Answer:

it has 79 protons

Explanation:

the atomic number is equal to the number of protons an element has.

3 0
3 years ago
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