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mel-nik [20]
3 years ago
13

2 Students were asked to identify the location of elements in the periodic table based on clues

Chemistry
1 answer:
rjkz [21]3 years ago
3 0

Answer:

B

Explanation:

I took the test

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If an atom has 15 protons, 14 neutrons, and 17 electrons, what is the atom's electrical charge?
coldgirl [10]

Answer:

Hello

B. -2

is ur answer

Explanation:

thanks

7 0
3 years ago
Determine the number of grams of sodium carbonate needed to prepare 100.0 ml of a 2.5 m solution
SCORPION-xisa [38]

Answer:

26.5 g

Explanation:

First we convert 100.0 mL to L:

  • 100.0 mL / 1000 = 0.100 L

Now we <u>calculate how many moles of sodium carbonate are needed</u>, using the <em>definition of molarity</em>:

  • Molarity = moles / liters
  • moles = molarity * liters
  • 2.5 M * 0.100 L = 0.25 mol

Finally we <u>convert 0.25 moles of sodium carbonate into grams</u>, using its <em>molar mass</em>:

  • 0.25 mol * 106 g/mol = 26.5 g
6 0
3 years ago
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