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Yanka [14]
2 years ago
9

Which is TRUE about burning fossil fuels?

Chemistry
2 answers:
Nastasia [14]2 years ago
8 0
For this, I would say B.
I know that is a fact. Oxygen is needed to keep fires going.
IDK for A.
C is false. Coal is almost pure carbon. 
D is also false as coal and other fuels give off massive amounts of heat when burned.
KIM [24]2 years ago
5 0
B makes the most sence. thr other choices just dont make any logical sense at all. every time fuel is burned it does react with oxygen
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What is the acceleration of an object if it goes from a velocity of +25m/s to rest in 5.0s?
kari74 [83]

Vf = Vi + at

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5 0
3 years ago
Which of these expressions are correct variations of the Combined Gas Law?
mafiozo [28]

Answer:

Both

Explanation:

The combined gas law is also known as the general gas law.

From the ideal gas law we assume that n = 1;

So;

              PV  = nRT

 and then;

                  \frac{P_{1}V_{1}  }{T_{1} }  = \frac{P_{2}V_{2}  }{T_{2} }

   If we cross multiply;

                P₁V₁T₂   = P₂V₂T₁

  So;

         T₁ = T_{2} \frac{P_{1}V_{1}  }{P_{2} V_{2} }

Also;

         V₂  = V_{1} \frac{P_{1} T_{2} }{P_{2} T_{1} }

So from the choices both are correct

3 0
3 years ago
What is formed when atoms join together with a covalent bond?
Feliz [49]

B) a molecule

A molecule is formed when two atoms join together with a covalent bond.

5 0
3 years ago
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How many moles of potassium chloride are in 28 grams of KCl?
stiv31 [10]

Answer:

0.3758moles

Explanation:

moles of kcl = mass of kcl/ molar mass of kcl = 28/74.5 = 0.3758moles

7 0
2 years ago
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Which of the following changes to a system WILL NOT result in an increase in the system’s pressure?
Sophie [7]

Answer:

B. All the rest raise P.

Explanation:

6 0
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