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3 years ago

Which of the following is an example of potential energy? 1.bouncing ball 2.swinging a bat 3.book on a table 4.falling leaf

Chemistry

1 answer:

azamat3 years ago

3 0

Answer:

book on a table

Explanation:

a book on a table is an example of potential energy because when you slide the book off the table or just slide it in general it becomes kinectic energy

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10. What is the specific heat of an unknown substance if a 2.50 g sample releases 12 calories as its

Sergeu [11.5K]

Answer:

c = 4016.64 j/g.°C

Explanation:

Given data:

Mass of substance = 2.50 g

Calories release = 12 cal (12 ×4184 = 50208 j)

Initial temperature = 25°C

Final temperature = 20°C

Specific heat of substance = ?

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Solution:

Q = m.c. ΔT

ΔT = T2 - T1

ΔT = 20°C - 25°C

ΔT = -5°C

50208 j = 2.50 g . c. -5°C

50208 j = -12.5 g.°C .c

50208 j /-12.5 g.°C = c

c = 4016.64 j/g.°C

4 0

3 years ago

The specific heat of aluminum and plastic are 0.800 J/g.°C and 1.600 J/g.°C respectively. If it takes about 36minutes for a plas

blagie [28]

Answer:

$mc \alpha t$

mass=m

c=specific heat capacity

$\alpha t$

change in temperature

8 0

2 years ago

Below is a proposed mechanism for the decomposition of H2O2. H2O2 + I– → H2O + IO– slow H2O2 + IO– → H2O + O2 + I– fast Which of

Savatey [412]

Answer: Option (d) is the correct answer.

Explanation:

The given equations as as follows.

$H_{2}O_{2} + I^{-} \rightarrow H_{2}O + IO^{-}$ (slow)

$H_{2}O_{2} + IO^{-} \rightarrow H_{2}O + O_{2} + I^{-}$

Therefore, overall reaction equation will be as follows.

$2H_{2}O_{2} + I^{-} + IO^{-} \rightarrow 2H_{2}O + O_{2} + IO^{-} + I^{-}$

So, cancelling the spectator ions then the equation will be as follows.

$H_{2}O_{2} \rightarrow 2H_{2}O + O_{2}$

As, it is known that slow step of a reaction is the rate determining step. Therefore, rate law for the slow step will be as follows.

$H_{2}O_{2} + I^{-} \rightarrow H_{2}O + IO^{-}$

Rate law = $k[H_{2}O_{2}][I^{-}]$

Hence, the reaction is first order with respect to $[I^{-}]$ and it is also first order reaction with respect to $[H_{2}O_{2}]$ .

Also, $[I^{-}]$ acts as a catalyst in the reaction.

Thus, we can conclude that the incorrect statement is $IO^{-}$ is a catalyst.

6 0

3 years ago

Which is NOT represented in a chemical<br> equation?

puteri [66]

Answer:

The amount of atoms baee :)

Explanation:

3 0

4 years ago

Read 2 more answers

Which is the correct order largest to smallest

expeople1 [14]

Answer:

how am i suppose to put it in largest to smallest if u didnt give any numbers

6 0

3 years ago