2 years ago

Why do ionic compounds have high melting points?

1 answer:

4 0

These oppositely charged compounds are strongly held by electrostatic forces of attraction as these be together for a long time the rise in temparature occurs so that the the melting points rises in them.

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If 12.5 grams of the original sample of cesium-137 remained after 90.6 years, what was the mass of the original sample?

myrzilka [38]

Answer:

Mass of original sample = 100 g

Explanation:

Half life of cesium-137 = 30.17 years

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

Where, k is rate constant

So,

$k=\frac{\ln2}{t_{1/2}}$

$k=\frac{\ln2}{30.17}\ year^{-1}$

The rate constant, k = 0.02297 year⁻¹

Time = 90.6 years

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration

Initial concentration $[A_0]$ = ?

Final concentration $[A_t]$ = 12.5 grams

Applying in the above equation, we get that:-

$12.5\ g=[A_0]e^{-0.02297\times 90.6}$

$[A_0]=\frac{12.5}{e^{-0.02297\times 90.6}}\ g=100\ g$

Mass of original sample = 100 g

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2 years ago

Does the model below represent a mixture or a substance ?

Vikentia [17]

Answer:

substance

Explanation:

A mixture is when two or more different atoms/molecules are together, but not joined.

A substance is when the same atom/molecule is in a group together.

In this example, it is a substance because it is comprised of the same molecule not joined all together. If you wanted a mixture, other colored atoms/molecule (e.g. add green atoms) would change it to this property.

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2 years ago

What is the term for a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concent

Lubov Fominskaja [6]

The answer is:
Osmosis

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2 years ago

As the temperature of a liquid increases, its viscosity _____. increases stays the same decreases

Valentin [98]

As the temperature of a liquid increases, its viscosity decreases.

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2 years ago