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Zinaida [17]
3 years ago
8

Why is combustion of fuel necessary for heat engines to do work?

Chemistry
2 answers:
azamat3 years ago
6 0

Because during combustion reaction, heat energy is released and it's this energy that is converted to work

sweet-ann [11.9K]3 years ago
5 0

Answer:

The energy from fuel can only be used when it is in the form of thermal energy. The energy stored in the chemical bonds of fuel are converted to thermal energy when the fuel is burned.

Explanation:

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Write the complete ionic equation for the reaction that takes place when aqueous solutions of strontium hydroxide and lithium ph
Nesterboy [21]

Answer : The net ionic equation will be,

3Sr^{2+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)

Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The given balanced ionic equation will be,

3Sr(OH)_2(aq)+2Li_3​PO_4(aq)\rightarrow 6LiOH(aq)+Sr_3(PO_4)_2(s)

The ionic equation in separated aqueous solution will be,

3Sr^{2+}(aq)+6OH^{-}(aq)+6Li^{+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)+6Li^+(aq)+6OH^{-}(aq)

In this equation, Li^+\text{ and }OH^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

3Sr^{2+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)

4 0
3 years ago
there are 28L of soup in a pot. Marshall serves 400mL in each bowl. If he fills 16 bowls how much soup is left in the pot? in li
Ne4ueva [31]
Total in pot=28 L
400 mL in each bowl
16 bowls filled
1000mL=1L
16 bowls(400mL/1 bowl)=6400mL
6400mL(1L/1000mL)=6.4L
28L-6.4L=21.6 L
5 0
4 years ago
Which element are cations? how do you know?
Paladinen [302]

If it has a positive charge it is a cation if negative it is an anion .

I attached a chart that will help you know the charges of the elements

8 0
3 years ago
Read 2 more answers
Which law relates temperature, pressure, volume, and the number of moles of a gas under perfect conditions? Boyle's law Charles'
Triss [41]
<span>The correct answer is ideal gas law.

when the ideal gas law formula is:

 PV = nRT ,

when P is the pressure. 

V is the volume. 

and R is the ideal gas constant.

T is the temperature. 

and n is the number of moles.

So, this is the law which relates pressure, temperature, volume and number of moles . and this law state that 1 mole of an ideal gas will occupy a volume V = 22.4 L</span>
6 0
3 years ago
Read 2 more answers
Which of the following is the primary source of mass in a plant?
lora16 [44]

Answer:

SUNLIGHT

Explanation:

The sun energy into chemical energy which is calptured within the bonds of carbon molecules built from atmospheric carbon dioxide and water.

8 0
3 years ago
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