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3 years ago

Why dose heating increase the speed at which a solution dissolved in water

Chemistry

1 answer:

emmainna [20.7K]3 years ago

4 0

Answer:

The added energy in the hot water causes water molecules to move faster and sucrose molecules to vibrate faster.

Explanation:

This added movement tends to make the bonds between sucrose molecules easier to overcome.

Hope it helps :-)

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In chemistry-what is a catalyst

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A catalyst is a substance that decrease the activation energy needed to start a reaction.

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4 years ago

Carbon-14 is a radioactive isotope that decays according to first-order kinetics in a process that has a half-life of 5730 years

Sliva [168]

Answer : The time passed in years is $2.83\times 10^3\text{ years}$

Explanation :

Half-life = 5730 years

First we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{t_{1/2}}$

$k=\frac{0.693}{5730\text{ years}}$

$k=1.21\times 10^{-4}\text{ years}^{-1}$

Now we have to calculate the time passed.

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $1.21\times 10^{-4}\text{ years}^{-1}$

t = time passed by the sample = ?

a = let initial amount of the reactant = X g

a - x = amount left after decay process = $71\% \times (x)=\frac{71}{100}\times (X)=0.71Xg$

Now put all the given values in above equation, we get

$t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{X}{0.71X}$

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Therefore, the time passed in years is $2.83\times 10^3\text{ years}$

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3 years ago

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padilas [110]

Answer:

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Explanation:

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3 years ago

The volume of 350. mL of gas at 25°C is decreased to 250. mL at

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V1/T1 = V2/T2

V1 = 350. mL

T1 = 25 + 273 = 298 K

V2 = 250. mL

T2 = ?

Solve the equation for T2: T2 = V2T1/V1 = (250. mL)(298 K)/(350. mL) = 213 K = -60°C

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3 years ago