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3 years ago

Which of the following is a galvanic cell?

Chemistry

1 answer:

Gemiola [76]3 years ago

5 0

Answer:

i think Aluminum (Al) oxidized, zinc(Zn) reduced

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A graduated cylinder is filled with 20ml of water. A rock is dropped in to the graduated cyclinder and the volume of water rises

Kitty [74]

Answer:

$\boxed {\boxed {\sf 2.3 \ g/mL}}$

Explanation:

We are asked to find the density of a rock. Density is the substance's mass per unit volume. The formula for calculating density is:

$\rho= \frac{m}{v}$

The mass of the rock is 23 grams. The volume was found using water displacement. A known amount of water was measured, the rock was added to the graduated cylinder, and the water level was recorded again. The volume is the difference between the final and initial water level. The graduated cylinder originally had 20 milliliters and the water rose to 30 milliliters.

volume = final water level - initial water level
volume = 30 mL - 20 mL
volume = 10 mL

Now we know the mass and the volume.

m= 23 g
v= 10 mL

Substitute the values into the formula.

$\rho= \frac{ 23 \ g }{30 \ mL}$

Divide.

$\rho= 2.3 \ g/mL$

The density of the rock is <u>2.3 grams per milliliter.</u>

8 0

3 years ago

What happens at the cathode in an electrolytic cell?

Aliun [14]

Answer:

D. Reduction

Explanation:

In the electrolytic cell, reduction occurs at the cathode

3 0

3 years ago

name the scientists who shared the Nobel Prize in Physics in 1903 and describe their contributions that were recognized by the a

Zanzabum

The nobel prize in 1903 was given and awarded to Antoine Henri Becquerel, and Pierre Curie, Marie Curie, nee Sklodowska.
Reasons for the given awards;
Antoine Henri Becquerel because; "In recognition of the extraordinary services he has rendered by his discovery of spontaneous radioactivity."
And the others (Pierre Curie and Marie Curie, nee Sklodowska) because; "In recognition of the extraordinary services they have rendered by their joint researches on the radiation phenomena, discovered by Professor Henri Becquerel."

7 0

3 years ago

What is the scientific method? *

mars1129 [50]

The answers is a, A series of steps used by scientists to investigate a hypothesis

5 0

2 years ago

A sample of AgCl is treated with 5mL of 2M Na2CO3 solution to produce Ag2CO3. The remaining solution contained 0.003gm of Cl per

Volgvan

Answer: The solubility product of AgCl is $10.73 \times 10^{-9}$ .

Explanation:

The reaction equation is as follows.

$Ag_{2}CO_{3} \rightleftharpoons 2Ag^{+} + CO^{2-}_{3}$

Let us assume the concentration of $2Ag^{+}$ is 2S and concentration of $CO^{2-}_{3}$ is S. Hence, the expression for $K_{sp}$ of this reaction is as follows.

$K_{sp} = [Ag^{+}]^{2}[CO^{2-}_{3}]\\8.2 \times 10^{-12} = (2S)^{2}(S)\\8.2 \times 10^{-2} = 4S^{3}\\S = 1.27 \times 10^{-4}$

This means that $[Ag^{+}]$ is $1.27 \times 10^{-4}$ . Now, the concentration of $Cl^{-}$ is calculated as follows.

$[Cl^{-}] = \frac{mass}{molar mass}\\= \frac{0.003 g}{35.5 g/mol}\\= 8.45 \times 10^{-5} M$

Hence, $K_{sp}$ for AgCl is calculated as follows.

$K_{sp} = [Ag^{+}] \times [Cl^{-}]\\= 1.27 \times 10^{-4} \times 8.45 \times 10^{-5}\\= 10.73 \times 10^{-9}$

Thus, we can conclude that solubility product of AgCl is $10.73 \times 10^{-9}$ .

4 0

3 years ago