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erma4kov [3.2K]

2 years ago

10

Jennie decides to mix the content of her beaker with another lab group to see “the results.” Is this safe why or why not explain

why.

1 answer:

Ray Of Light [21]2 years ago

6 0

Answer: no

Explanation:

It could be dangerous since you don't know what substance are you adding.it may end up in an explosion

I hope this helps :)

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Which of the following gases in Earth's atmosphere would you expect to find as molecules and which as individual atoms? Explain

azamat

Answer: argon

Explanation:

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3 years ago

What is the half-life of an isotope that decays to 6.25% of its original activity in 18.9 hours?

inessss [21]

Radioactive material obeys 1st order decay kinetics,
For 1st order reaction, we have
k = $\frac{2.303}{t}Xlog \frac{\text{initial conc.}}{\text{final conc.}}$
where, k = rate constant of reaction

Given: Initial conc. 100, Final conc. = 6.25, t = 18.9 hours

∴ k = $\frac{2.303}{18.9} X log \frac{100}{6.25}$ = 0.1467 hours^(-1)

Now, for 1st order reactions: half life = $\frac{0.693}{k} = \frac{0.693}{0.1467}$ = 4.723 hours.

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3 years ago

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Dominik [7]

Answer:

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Explanation:

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3 years ago

1) Why are the antimony and beryllium ions so small? Differentiate between the causes.

Viefleur [7K]

1. For this question, the adjective small must be percepted in a relative sense. This is because it is not the smallest ion (that would be hydrogen). It could be that the antimony and beryllium ions are smaller compared to their neutral forms. This is because they donate electrons when ionized. As a result, the electrons are reduced, so does the electron cloud which makes the radius much smaller.

2. The periodic table is arranged in terms of increasing atomic number. For neutral atoms, the number of protons (atomic number) is equal to the number of electrons. So, the farther we go down the table, the higher the atomic number. The higher the atomic number, the bigger the electron cloud which makes the atomic radius bigger. Because by definition, atomic radius is the length from the nucleus to the farthest electron from the nucleus.

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3 years ago

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On a cold, winter day, Sheena rubs her hands together to warm them up. How could Sheena actions be used to explain the Law of Co

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Answer:

When she rubs her hands together, it causes heat or friction

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3 years ago