N= m/v n=0.077/.200 = 0.385
Answer:
Aluminium Can not rust (Can't rust also meaning <u>Corrode)</u>
Because it's surface is protected by aluminium Oxide which stops the metal below from coming in contact with the air (which contains Oxygen) Unlike rust, which can flake off the surface of iron and steel objects, the layer of aluminium oxide does not flake off.
<u>Corrode</u>
<u>destroy or damage (metal, stone, or other materials) slowly by chemical action.</u>
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Answer:
D
Explanation:
Diabetes is caused when the pancreas has trouble producing insulin, a hormone that lowers blood sugar levels. Since the endocrine system deals with hormones, diabetes is an endocrine system disease.
Answer:
Molecular formula: S4K8O16 empirical formula: SK2O4
Explanation:
First we find the moles of each by first finding grams (using the percent) and then using stoichiometry to convert into moles:
Sulfur: 696 *.18 = 125.28grams S*
Potassium: 696 *.4487 = 312.2952 *= 7.99117 mole K
Oxygen: 696 * .367 = 255.432 * = 15.9654 mole O
Then we divide each value by the atom with the smallest number of moles to find the mole ratio:
3.907/3.907= 1
7.99117 mole K/ 3.907= 2.043
15.9654 mole O/ 3.907= 4.08
The empirical formula is SK2O4
To find the molecular formula, we divide the mass given (696) by the mass of the empirical formula (174.22) to get 4. We then divide each atom by 4.
Molecular formula: S4K8O16
In the given reaction potassium metal is placed in water and when a reactive metal is placed in water, it reacts with water to form metal hydroxide and hydrogen gas, as a result, potassium hydroxide and hydrogen gas are produced in the reaction. A redox reaction is a reaction in which a substance is oxidized during the reaction whereas some other substance is reduced during the reaction, simultaneously.
The given chemical reaction is:
2K(s) + 2H20(l) arrow 2KOH(aq) + H2(g)
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