The most abundant element on the earth's crust is
nitrogen
hydrogen
oxygen
flourine
Correct answer is C
- The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
HOWEVER;
- Earth's crust is made up of several elements: oxygen, 46.6 percent by weight; silicon, 27.7 percent; aluminum, 8.1 percent; iron, 5 percent; calcium, 3.6 percent; sodium, 2.8 percent, potassium, 2.6 percent, and magnesium, 2.1 percent.
- This implies that Oxygen is the most abundant element (by mass) in the Earth's crust, making up almost half of the crust's mass
In the diagram above which of the cures illustrates Arrhenius' law?
Y
Z
R
X
Correct answer is D
No explanation has been provided for this answer.
The most suitable metal that can be used as lightning conductor is?
silver
copper
iron
aluminium
Correct answer is B
In reality, silver actually has an even higher electrical conductivity than copper, but silver is too expensive to use.
NH4Cl(s) ↔ NH3(g) + HCL(g)
The reaction above can only attain equilibrium if
a gaseous reactant is added
one of the products is removed
it is in a closed system
it is an open system
Correct answer is C
No explanation has been provided for this answer.
The gas that can be dried using concentrated tetraoxosulphate (VI) acid is
hydrogen bromide
Sulphur (IV) oxide
hydrogen sulphide
ammonia
Correct answer is B
No explanation has been provided for this answer.
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