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3 years ago

What type of energy is elastic energy?

2 answers:

5 0

My guess its that it is potential engery! D

explanation: elastic energy comes from mechanical potential energy so my best guess is that you go to D! btw im also trying to get a brainiest, so if you can or want to please give me one :) thank you

ivanzaharov [21]3 years ago

4 0

Answer:

D. potential energy

Explanation:

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gizmo_the_mogwai [7]

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3 years ago

Which of the following is a chemical change?

Scorpion4ik [409]

Answer: D, splitting water into hydrogen and oxygen is a chemical change.

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2 years ago

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A lead mass is heated and placed in a foam cup calorimeter containing 40.0 mL of water at 17.0°C. The water reaches a temperatur

lbvjy [14]

Answer: 502 Joules

Explanation:

To calculate the mass of water, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Density of water = 1 g/mL

Volume of water = 40.0 mL

Putting values in above equation, we get:

$1g/mL=\frac{\text{Mass of water}}{40.0mL}\\\\\text{Mass of water}=(1g/mL\times 40.0mL)=40.0g$

When metal is dipped in water, the amount of heat released by lead will be equal to the amount of heat absorbed by water.

$Heat_{\text{absorbed}}=Heat_{\text{released}}$

The equation used to calculate heat released or absorbed follows:

$q=m\times c\times \Delta T$

q = heat absorbed by water

$m$ = mass of water = 40.0 g

$T_{final}$ = final temperature of water = 20.0°C

$T_{initial$ = initial temperature of water = 17.0°C

$c$ = specific heat of water= 4.186 J/g°C

Putting values in equation 1, we get:

$q=40.0\times 4.186\times (20.0-17.0)]$

$q=502J$

Hence, the joules of heat were re-leased by the lead is 502

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3 years ago

How many moles are in 20 grams of O₂ gas?

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20 g O2 x 1 mol O2/32 g O = 0.625 mol O2

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3 years ago

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P1V1/T1 = P2V2/T2

Then just plug in and solve algebraically.

Hope this helps

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3 years ago