<span>Methane, answer c, can be decomposed by chemical means because methane is a compound. Methane is made up of one atom of carbon and four atoms of hydrogen. Compounds can be broken down. Cobalt, krypton, and zirconium are all elements, and elements cannot be chemically decomposed.</span>
Mixtures are impure substances composed of two or more substances physically combined.
<h3>What are mixtures?</h3>
Mixtures are substances that are composed of two or more substances physically combined.
Mixtures are one of the different types of substances which are composed of matter.
The classification of matter by type of substance is as follows:
- Matter - Pure and impure substances or mixtures
- Pure substances - elements and compounds
- Mixtures: homogenous and heterogenous
In conclusion, substances can be classified into either pure substances or mixtures.
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Answer:
Mg+2HCL-Magnesium Chloride +Hygrogen

Explanation:
N.O of moles=Mass\Molar Mass
192÷24=8
1:1
8×2=16
After the addition of 6.47 mL of 0.303 M HCl. Solution :- lets first calculate the moles of the NaOCl and HCl Moles = molarity *volume in liter Moles of NaOCl = 0.100 mol per L * 0.053 L =0.0053 mol Moles of HCl =0.303 mol per L *0.00647L=0.00196
Your answer is 20.7298014