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3 years ago

7

Calcium chloride has a melting point of 772°C, and water has a boiling point of 100°C. Which statement is true for calcium chlor

ide and water?

1 answer:

nekit [7.7K]3 years ago

4 0

The difference is due to the fact that calcium chloride has stronger intermolecular forces than water.

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What fraction of a Sr-90 sample remains unchanged after 87.3 years

jolli1 [7]

The answer is 1/8.

Half-life is the time required for the amount of a sample to half its value.
To calculate this, we will use the following formulas:
1. $(1/2)^{n} = x$ ,
where:
<span>n - a number of half-lives
</span>x - a remained fraction of a sample

2. $t_{1/2} = \frac{t}{n}$
where:
<span> $t_{1/2}$ - half-life
</span>t - <span>total time elapsed
</span><span>n - a number of half-lives
</span>
The half-life of Sr-90 is 28.8 years.
So, we know:
t = 87.3 years
<span> $t_{1/2}$ = 28.8 years

We need:
n = ?
x = ?
</span>
We could first use the second equation, to calculate n:
<span>If:
$t_{1/2} = \frac{t}{n}$ ,
</span>Then:
$n = \frac{t}{ t_{1/2} }$
⇒ $n = \frac{87.3 years}{28.8 years}$
⇒ $n=3.03$
<span>⇒ n ≈ 3
</span>
Now we can use the first equation to calculate the remained amount of the sample.
<span> $(1/2)^{n} = x$
</span>⇒ $x=(1/2)^3$
⇒ $x= \frac{1}{8}$ <span>
</span>

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3 years ago

Which element is the first element in group 13 of the periodic table of elements?

joja [24]

Answer:

Boron

Explanation:

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What was important about the Hydrogen bright line emission spectrum?

Art [367]

Answer:

The emission spectrum lines are the changes in the quantum energy levels of the single electron in the Hydrogen atom.

Explanation:

Electrons move around the hydrogen atom in electron waves patterns. These waves occur in distinct quantum energy levels.

The change from one quantum energy level to another energy level has a definite energy level change. There is a wave length associated with each change in energy levels. These wave lengths have a color associated with them.

Low energy level changes have long wave lengths associated with them giving red and orange colors.

High energy level changes have short wave lengths associated with them giving blue and violet colors.

Note each atom has a unique emission spectrum associated with the energy levels and electron structure of the atom. Helium was first discovered by looking at its emission spectrum as seen in the sun.

Explanation:

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2 years ago

What is the overall order of reaction for this rate law: Rate = k ? zero first second third

DENIUS [597]

The overall order of a reaction is directly related to the reaction mechanism of the reaction. The reaction mechanism is defined by the reaction rate equation. In this case, we are given by the equation, Rate=k. The order of this reaction is zero since the rate is not dependent on the concentration of reactants or products.

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3 years ago

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Why are there few fossils of protists. write a paragraph response

Liono4ka [1.6K]

Answer:

protists that produce a hard outer covering have left many fossils, other protists lack hard parts, so few fossils of these organisms have been found. ... Protists in this group are called plantlike because, like plants, they contain the pigment chlorophyll in chloroplasts and can make their own food.

Explanation:

Hope it helps, some how.

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2 years ago