Energy transfer by convection is usually restricted to what type of substance?

1 answer:

7 0

Convection generally describes warm material rising and cool material sinking. In order to have all that rising and sinking, it pretty much needs to be going on in a liquid or other kind of fluid ... something that flows.

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How much energy is required to completely vaporize 250 grams of liquid water that is already at 100 degrees Celsius? Show your w

Vladimir79 [104]

Answer:

564100J (~ 565000J) of heat energy is required.

Explanation:

The enthalpy of vaporization of water is 2256.4J/g, meaning that 2256.4J of heat is required to convert 1 gram of water at 100 degrees Celcius to steam at 100 degrees Celcius.

In your case, we have 250g of water at 100C and we want to vaporize it to steam (also at 100C).

This requires ΔH = 2256.4(250) = 564100J of heat energy.

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3 years ago

Which statement is correct about the reaction that occurs between calcium chloride and sodium carbonate? It is a single replacem

Nataly_w [17]

Answer: It is a double replacement reaction because calcium chloride and sodium carbonate exchange their non-metallic parts.

Explanation:

Double displacement reaction: It is a type of chemical reaction in which two reactants exchange their ions to form new compound as a product. In this type of reaction product is obtained in the form of a precipitate.

$AB+CD\rightarrow AD+CB$

$CaCl_2+Na_2CO_3\rightarrow CaCO3+2NaCl$

In a given reaction , $CaCL_2$ are reactants $Na_2CO_3$ and form products by exchanging their nonmetallic parts. The products obtained in the reaction are $CaCO_3$ and $NaCl$