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3 years ago

9

All of the following statements concerning voltaic cells are true EXCEPT

1 answer:

MissTica3 years ago

3 0

Answer:

oxidation occurs at the cathode.

Explanation:

In a voltaic cell electrons move from anode to cathode. At the anode, species give up electrons. This is an oxidation reaction depicted by the oxidation half equation. At the cathode, species accept electrons and become reduced. This is depicted by the reduction half equation. In summary; in a Voltaic cell, oxidation occurs at the anode while reduction occurs at the cathode.

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Express the product of 5.4 mm and 6.02 mm using the correct number of significant digits.

krek1111 [17]

we are asked to multiply 5.4 mm by 6.02 mm

5.4 mm has 2 significant figures

6.02 mm has 3 significant figures

When multiplying these 2 numbers the answer should have the least number of significant figures

From the 2 numbers the least number of significant figures is 2 , therefore answer should be rounded off to 2 significant numbers

5.4 x 6.02 = 32.5 rounded off is 33

Answer is b. 33 m^2

5 0

3 years ago

Which has more kenetic energy: A 150 g bullet fired from a gun achieving a velocity of 440 m/s and a standard baseball weighing

aleksley [76]

Answer:

Bullet has more kinetic energy then baseball.

Explanation:

Mass of the bullet , m = 150 g = 0.150 kg

Velocity of the bullet = v = 440 m/s

Kinetic energy = $\frac{1}{2}\times mass\times (velocity)^2$

Kinetic energy of the bullet = K.E

$K.E=\frac{1}{2}mv^2=\frac{1}{2}\times 0.150 kg\times (440 m/s)^2$

$=14,520 Joules$

Mass of the baseball, m' = $\frac{51}{4} oz$ = 0.36146 kg

(1 ounce = 0.0283495 kg)

Velocity of the baseball= v' = 105.1 mph

1 mile = 1609.34 m

1 hour = 3600 seconds

$v'=\frac{ 105.1\times 1609.34 m}{3600 s}=46.98 m/s$

Kinetic energy of the baseball = K.E'

$K.E'=\frac{1}{2}m'v'^2=\frac{1}{2}\times 0.36146 kg\times (46.98 m/s)^2$

$=398.83 Joules$

14,520 Joules > 398.83 Joules

K.E > K.E'

Bullet has more kinetic energy then baseball.

7 0

4 years ago

If a solution has a pH = 3, and another solution has a pH = 5, in terms of acidic strength, how many times weaker is the second

scoray [572]

I think they might have the answer online

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3 years ago

Read 2 more answers

A solar panel combines multiple photovoltaic cells. Which type of energy is used to power a solar panel?

Softa [21]

Explanation:

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<u>SUNLIGHT</u> is the answer

Hope this is correct

HAVE A GOOD DAY!

3 0

3 years ago

Read 2 more answers

1. If temperature is increased, the number of<br> collisions per second

andrey2020 [161]

Answer:

Increases

Explanation:

Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions.

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3 years ago