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Ivanshal [37]
3 years ago
10

A student visits the beach during a very hot day. She steps on the sand and jumps because it is so hot. What type of heat transf

er is demonstrated by the sand in this example?
Chemistry
2 answers:
Vlad [161]3 years ago
7 0

Answer: Conduction, because her feet are touching the hot sand.

sammy [17]3 years ago
3 0
Answer is: thermal conductuction.
Thermal conductuction is the transfer of heat<span> through physical contact. </span>Thermal conduction<span> is the transfer of heat</span> by microscopic collisions of particles. <span>Heat spontaneously flows from a hotter to a colder body.
</span>The process of heat conduction depends on four basic factors: the temperature gradient<span>, the cross section of the </span>materials<span> involved, their path length and the properties of those materials.</span>


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Answer:

Option 3. The catalyst does not affect the enthalpy change (\Delta H_\text{rxn}) of a reaction.

Explanation:

As its name suggests, the enthalpy change of a reaction (\Delta H_\text{rxn}) is the difference between the enthalpy of the products and the reactants.

On the other hand, a catalyst speeds up a reaction because it provides an alternative reaction pathway from the reactants to the products.

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f = 2.78 * 10^14 seconds
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