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3 years ago

When the chemical energy in the coal is burned it is converted to.

Chemistry

2 answers:

Lunna [17]3 years ago

8 0

Answer:

Mechanical energy

Explanation:

because the heat energy turn into a mechanical energy that spins the engine

Dafna11 [192]3 years ago

7 0

Answer:

Heat Energy

Explanation:

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A student heats a sample of hydrate once, and the mass of the sample and the evaporating dish is 16.428 g. After a second heatin

jolli1 [7]

Answer:

12.371 g

Explanation:

Given :

$m_{evaporating\ dish}=1.135\ g$

$m_{evaporating\ dish}+m_{Hydrate\ sample}=25.637\ g$

$m_{evaporating\ dish}+m_{First\ heated\ sample}=16.428\ g$

$m_{evaporating\ dish}+m_{Second\ heated\ sample}=13.266\ g$

Mass of salt hydrate:

$m_{evaporating\ dish}=1.135\ g$

$m_{evaporating\ dish}+m_{Hydrate\ sample}=25.637\ g$

$m_{Hydrate\ sample}=25.637-m_{evaporating\ dish}\ g=25.637-1.135\ g=24.502\ g$

Mass of salt anhydrous:

$m_{evaporating\ dish}=1.135\ g$

$m_{evaporating\ dish}+m_{Second\ heated\ sample}=13.266\ g$

$m_{Second\ heated\ sample}=m_{salt\ anhydrous}=13.266-m_{evaporating\ dish}\ g=13.266-1.135\ g=12.131\ g$

Mass of water:

$m_{water}=m_{Hydrate\ sample}-m_{salt\ anhydrous}=24.502-12.131\ g=12.371\ g$

$m_{water}=12.371\ g$

4 0

3 years ago

Use the data in the table above to calculate an approximate ΔH∘ in kilojoules for the synthesis of hydrazine from ammonia:

dmitriy555 [2]

On the left (reactant) side you have 6 N-H bonds and 1 Cl-Cl bond
On the right (product) side you have 4 N-H bonds, 1 N-N bond and 2 H-Cl bonds 

Add up the bond energies for each side (multiplying by the number of bonds) and calculate the difference for your ΔHº

7 0

3 years ago

A car walks 3 m north and then 15 m south. What distance did the cat walk

GaryK [48]

18m. It does not matter what direction the cat walked as long as it walked in a certain direction for said amount of distance

4 0

3 years ago

Read 2 more answers

5) List two traits that are heritable: 6) List two traits that are not heritable:

Mnenie [13.5K]

Answer: hertable are traits, eye color,and height

not hertable are specific chararistics , trait, or behavior

Explanation:

5 0

3 years ago

HELP PLS! I NEED TO GET THIS RIGHT! Curious Carl and his lab partner were conducting a variety of experiments to produce gases:

katen-ka-za [31]

Answer:

0.25 mole of H₂

Explanation:

The equation for the reaction is given below:

Mg + 2HCl —> MgCl₂ + H₂

From the question given above, we were told that the reaction produced 5.6 L of H₂.

Thus, we can obtain obtain the number of mole of H₂ that occupied 5.6 L at STP as follow:

1 mole of H₂ occupied 22.4 L at STP.

Therefore, Xmol of H₂ will occupy 5.6 L at STP i.e

Xmol of H₂ = 5.6 / 22.4

Xmol of H₂ = 0.25 mole

Therefore, 0.25 mole of H₂ were obtained from the reaction.

8 0

2 years ago