Summarize information about sublimation

1 answer:

7 0

Sublimation is when a solid turns directly into a gas, completely bypassing the liquid phase. Dry ice is a good example.

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Boron has an atomic mass of 11. How many neutrons are in its nucleus? Use the periodic table if you wish.

makvit [3.9K]

Answer: The number of neutrons in boron are 6.

Explanation:

Atomic number is defined as the number of protons or electrons that are present in a neutral atom.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and number of neutrons present in an atom.

Mass number = Number of neutrons + Number of protons.

We are given:

Mass number = 11

Atomic number of boron = 5

Number of neutrons = Mass number - Atomic number = 11 - 5 = 6

Hence, the number of neutrons in boron are 6.

4 0

3 years ago

12 = 3X X = 7X = 57 X = 11X = 27.7 X =

dybincka [34]

Answer:
1. $x=4$
2. $x=\frac{57}{7}$
3. $x=\frac{27.7}{11}$

Explanation:

Given the following questions:

$12=3x$
$7x=57$
$11x=27.7$

In order to find the answers to these questions, we have to recognize that in order to isolate the variable we need to divide on both sides.

Question one:
$12=3x$
$\frac{3x}{3} =\div3$
$12\div3=4$
$x=4$

Question two:
$7x=57$
$\frac{7x}{7} =\div7$
$57\div7=8.14285714=\frac{57}{7}$
$x=\frac{57}{7}$

Question three:
$11x=27.7$
$\frac{11x}{11} \div11$
$27.7\div11=2.51818182=\frac{27.7}{11}$
$x=\frac{27.7}{11}$

Hope this helps.