In a hydraulic lift, the radius of the small and large pistons are
1 answer:
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Explanation:
Other characteristics of these changes are:
Physical changes are easily reversible but chemical changes are not.
Physical changes involves no change in mass like chemical changes.
Physical changes require little energy unlike chemical changes.
<u>Water turns to steam when boiled over a Bunsen burner </u><u>Physical change</u>
This is a physical change of state. It is called evaporation. Here, hydrogen bonds between each water molecules are broken and they turn to gases in steam phase.
H₂O → H₂O
<u>Carbon combines with oxygen to form carbon dioxide gas </u><u>Chemical change</u>
This is a typical chemical change":
C + O₂ → CO₂
A new product is formed and this reaction is not easily reversible.
<u>Water breaks down into hydrogen and oxygen gases. </u><u>Chemical change</u>
This is also a chemical change in which new products are formed:
H₂O → H₂ + O₂
<u>Limestone breaks down into lime and carbon dioxide when heated</u><u> Chemical change</u>
This is a chemical change as new product forms:
CaCO₃ → CaO + CO₂
Learn more:
Chemical change brainly.com/question/9388643
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Answer:
the question is incomplete, here is the complete question.
"On a chilly 12∘C day, you quickly take a deep breath--all your lungs can hold, 4.0 L. The air warms to your body temperature of 37∘C.If the air starts at a pressure of 1.0 atm, and you hold the volume of your lungs constant (a good approximation) and the number of molecules in your lungs stays constant as well (also a good approximation), what is the increase in pressure inside your lungs?
1.09 atm
Explanation:
the question addresses an ideal gas. where the relationship between the volume(v),pressure(p),temperature(T) and nos of molecules(n) is expressed as
Where R us the ideal gas constant.
From the question,the number of molecules,volume are constant, we can now re-write the equation as
where pressure and temperature are the only varying parameters.
if we vary the constant K we arrive at
since the Temprature must be in absolute temperature, we add 273k to it Celsius value.
Substituting value into the generated equation, we have