What is the greatest challenge we face on earth?

1 answer:

4 0

Now, we're currently in between with almost all the communist/republican countries.
Ever since Donald trump came in president. Things got a bit rough with China and the U.S
There might be a war soon WWIII.

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Which of the following is a heterogeneous mixture?

Deffense [45]

I think that the answer is B, but I may be wrong...

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3 years ago

Balanced nuclear equation forces the alpha decay Po-210

Serjik [45]

Answer:

$_{84}^{210}\text{Po} \longrightarrow \, _{82}^{206}\text{Pb} \, + \, _{2}^{4}\text{He}$

Explanation:

Your unbalanced nuclear equation is:

$_{84}^{210}\text{Po} \longrightarrow \, _{x}^{y}\text{Z} + \, _{2}^{4}\text{He}$

The main point to remember in balancing nuclear equations is that the sums of the superscripts and the subscripts must be the same on each side of the equation.

Then

84 = x + 2, so x = 84 - 2 = 82

210 = y + 4, so y = 210 - 4 = 206

Element 82 is lead, so the nuclear equation becomes

$_{84}^{210}\text{Po} \longrightarrow \, _{82}^{206}\text{Pb} \, + \, _{2}^{4}\text{He}$

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3 years ago

1. Atoms are

natita [175]

Answer:

a.the smallest building blocks of matter

Explanation:

because atoms are the smallest building blocks of matter.

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How can you demonstrate waves?

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Shaking a phone cord, strumming a guitar string, playing a trumpet

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Which of the following would heat up the quickest?

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Answer:

mercury( specific heat=0.140j/gc)

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