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SIZIF [17.4K]
3 years ago
9

An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. how many protons does boron have?

Chemistry
2 answers:
Ede4ka [16]3 years ago
7 0
Atomic number is equal to protons and electrons, so the answer is 5
defon3 years ago
5 0
It has 5 protons. Usually if an atom is neutral, the atomic number and the number of protons are the same.  <span />
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What happens as a result of the photoelectric effect? A.light is produced
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Answer:

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1 year ago
23.9 km + 15 km
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4 0
3 years ago
William measures a test tube and finds that the mass of the test tube is 5g. He places the lone reactant in the test tube and fi
iogann1982 [59]

86 percent is the percent yield for this experiment if he expected to produce 5g of product.

Explanation:

Given that:

mass of test tube = 5 grams

mass of test tube + reactant is 12.5 grams

mass of reactant = ( mass of test tube + reactant ) - (mass of test tube)

mass of reactant = 12.5 -5

                             = 7.5 grams

when 7.5 grams of reactant is heated mass of test tube was found to be 9.3 grams.

so mass of product formed = 9.3 - 5

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However, he expected the product to be 5 grams (theoretical yield)

Percent yield = \frac{actual yield}{theoretical yield} x 100

          putting the values in the formula:

percent yield = \frac{4.3}{5} x 100

                     = 86 %

86 percent is the percent yield.

5 0
3 years ago
Which plastic do you think could best contain extremely corrosive material? PETE, LDPE, PVC, PS, PP, or HDPE.
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Most gases ______________ .
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