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3 years ago

Part AWhat happens to the water molecules whenheat is added?

2 answers:

8 0

Molecules in a gas have lots of energy and spread out even more than molecules in a liquid. Warm water has more energy than cold water, which means that molecules in warm water move faster than molecules in cold water

Varvara68 [4.7K]3 years ago

4 0

Heat is essentially energy, so when you add heat to water molecules, they move around more.

Eventually, once enough heat is added, water molecules will be able to escape the Inter-Molecular Forces that hold them together and keep them as liquid. The molecules will be able to move around freely, and take on the form of steam.

If you need me to explain this in more depth, let me know.
-T.B.

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In a first-order decomposition reaction, 50.0% of a compound decomposes in 10.5 min.

mihalych1998 [28]

In this reaction 50% of the compound decompose in 10.5 min thus, it is half life of the reaction and denoted by symbol $t_{1/2}$ .

(a) For first order reaction, rate constant and half life time are related to each other as follows:

$k=\frac{0.6932}{t_{1/2}}=\frac{0.6932}{10.5 min}=0.066 min^{-1}$

Thus, rate constant of the reaction is $0.066 min^{-1}$ .

(b) Rate equation for first order reaction is as follows:

$k=\frac{2.303}{t_{1/2}}log\frac{[A_{0}]}{[A_{t}]}$

now, 75% of the compound is decomposed, if initial concentration $[A_{0} ]$ is 100 then concentration at time t $[A_{t} ]$ will be 100-75=25.

Putting the values,

$0.066 min^{-1}=\frac{2.303}{t}log\frac{100}{25}=\frac{2.303}{t}(0.6020)$

On rearranging,

$t=\frac{2.303\times 0.6020}{0.066 min^{-1}}=21 min$

Thus, time required for 75% decomposition is 21 min.

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3 years ago

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raketka [301]

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An electron:

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What should you do during a titration when you notice the indicator start to indicate the approach of the equilibrium point? Add

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B. Add the second reactant slower.

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Suppose that, from measurements in a microscope, you determine that a certain layer of graphene covers an area of 2.60μm2. conve

garri49 [273]

Given that 1 micrometer or micron (um) is equivalent by definition to 1 x 10^-6 m, this means that 1 square micron (um^2) is equivalent to (1 x 10^-6)^2 m^2, or 1 x 10^-12 m^2.

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3 years ago

Read 2 more answers

Part AWhat happens to the water molecules whenheat is added?​

Part AWhat happens to the water molecules whenheat is added?