Answer:
The answer is Helium.
Explanation:
Scandium's atomic number is 21.
Sulfur's atomic number is 16
Lithium's atomic number is 3
Helium's atomic number is 2.
Therefore, the answer is Helium.
<h2>
Answer:</h2>
Hydroxide ions.
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Explanation:</h2>
- When base reacts with water they form hydroxide ion.
- For example, NH₃ + H₂O ----------> NH₄⁺ + OH⁻
(Ammonia) (Water) (Ammonium) (Hydroxide ion).
- In case of strong and week base, generally weak bases partially reacts with water to produce hydroxide ions. Whereas strong base completely reacts with water to produce hydroxide ions And the reaction between a strong acid and a strong base produces salt and water and reaction is called neutralization reaction as both acid and base get neutralized.
Result: On reaction of base with water gives hydroxide ion.
Answer:
4.97 moles
Explanation:
There are 6.022*10^23 calcium atoms in 1 mole of Ca
2.99*10^24/6.022*10^23
=4.97 moles
Answer:
Condensation 212F or 100C, Freezing 32F or 0C
Explanation:
Condensation 212 degrees Fahrenheit or 100 degrees Celsius.
Freezing point 32 degrees Fahrenheit or 0 degrees Celsius.
Answer:
0.417 mol could be extracted from a medal that weighs 115 grams
Explanation:
Our Olympic medal weighs 115 g and we know that 71.5% is gold so how much from this medal is gold?
100 % ____ 115 g
71,5 % ____ 82.22 g
Molar mass of Au is 196.97 g/m
Mass / Molar mass = Moles
82.22 g / 196.97 g/m = 0.417 moles