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3 years ago

What is the only difference between an atom and an ion?

Chemistry

1 answer:

Andrei [34K]3 years ago

8 0

An ion is partials and an atom is a base

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What does an electromagnetic spectrum refer to?

Juliette [100K]

The entire distribution of electromagnetic radiation according to frequency or wavelength

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3 years ago

Which liquid boils at a lower temperature than water?

artcher [175]

There are a lot of liquids that do. All substances that appear in gas form under 100 degrees celsius boil faster than water.

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3 years ago

Read 2 more answers

Al2O3 + Fe Yields Fe3O4 + Al need before tomorrow

ella [17]

=148.413159df2ilo4sy+al2o3+al is the answer and have a nice day :)

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3 years ago

a 182.4g sample of germanium-66 is left undisturbed for 22.5 hours. At the end of that period, only 5.70g remain. What is the ha

Nana76 [90]

Answer:

Approximately $4.5\; \text{hours}$ .

Explanation:

Calculate the ratio between the mass of this sample after $22.5\; \text{hours}$ and the initial mass:

$\displaystyle \frac{5.70\; \rm g}{182.4\; \rm g} \approx 0.03125$ .

Let $n$ denote the number of half-lives in that $22.5\; \text{hours}$ (where $n\!$ might not necessarily be an integer.) The mass of the sample is supposed to become $(1/2)$ the previous quantity after each half-life. Therefore, if the initial mass of the sample is $1\; \rm g$ (for example,) the mass of the sample after $\! n$ half-lives would be ${(1/2)}^{n}\; \rm g$ . Regardless of the initial mass, the ratio between the mass of the sample after $n\!\!$ half-lives and the initial mass should be ${(1/2)}^{n}$ .

For this question:

${(1/2)}^{n}} = 0.03125$ .

Take the natural logarithm of both sides of this equation to solve for $n$ :

$\ln \left[{(1/2)}^{n}}\right] = \ln (0.03125)$ .

$n\, [\ln(1/2)] = \ln (0.03125)$ .

$\displaystyle n = \frac{\ln(0.03125)}{\ln(1/2)} \approx 5$ .

In other words, there are $5$ half-lives of this sample in $22.5\; \text{hours}$ . If the length of each half-life is constant, that length should be $(1/5) \times 22.5\; \text{hours} = 4.5\; \text{hours}$ .

4 0

3 years ago

HELP PLZ !! 10 POINTS !!

icang [17]

Answer:

Endothermic:

- Dry Ice subliming.

- Condensing of H2O on the side of a glass.

- Input of heat energy

- Ice melting

Exothermic:

- Vaporizing a block of Iron

- Water freezing

- Deionizing argon ions

- Release of heat energy

- The other one about the soot being deposited on the walls inside a chimney, i think it's exothermic.

6 0

4 years ago