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2 years ago

6

Which is a chemical property of copper? A. ability to oxidize B. color C. odor D. freezing point

1 answer:

Nat2105 [25]2 years ago

7 0

I think it is A. ability to oxidize :)

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The half-life of radioactive substance is 2.5 minutes. what fraction of the origional radioactive remains after 10 mins

saul85 [17]

The answer is 1/16.

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>
So, we know:
t = 10 min
<span> $t_{1/2}$ = 2.5 min

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:
$n = \frac{t}{ t_{1/2} }$
⇒ $n = \frac{10 min}{2.5 min}$
⇒ $n=4$ <span>
</span>
Now we can use the first equation to calculate the remained fraction of the sample.
<span> $(1/2)^{n} = x$
</span>⇒ $x=(1/2)^4$
<span>⇒ $x= \frac{1}{16}$ </span>

3 0

3 years ago

Which is not a characteristic of minerals

dem82 [27]

I think d is wrong because Everything else is correct for sure. also, minerals vary in the position they hold and have different chemical compounds.

6 0

2 years ago

Which of the following would be useful to show the growth rate of plants at varying temperatures? A. circle graph B. bar graph C

Pepsi [2]

Answer: Im thinking the answer Is B) Bar graph?

Explanation:

7 0

3 years ago

Read 2 more answers

Identify the type of chemical reaction of cobalt (III) fluoride

zysi [14]

The compound crystallizes in the aluminium trifluoride motif. Each fluoride is a doubly bridging ligand. The cobalt centers are octahedral.

CoF3 decomposes upon contact with water to give oxygen:

4 CoF3 + 2 H2O → 4 HF + 4 CoF2 + O2

It reacts with fluoride salts to give the anion [CoF6]3−, which is also features high-spin, octahedral cobalt(III) center.

4 0

3 years ago

Si uno pone un hilo en un hielo y un poco de sal el hilo se levanta el hilo con el hielo. Por que sé relaciona con calor y tempe

777dan777 [17]

Answer:

Explanation:

El hielo encierra la primavera antes de espolvorear la sal.

Cuando se rocía sal sobre el hielo, disminuye el punto de fusión del hielo 32 ° F a un poco por debajo de 32 °, por lo tanto, se acumula.

A medida que el hielo se vuelve a congelar, encierra la primavera

3 0

3 years ago