The equation CH4 + O2 ? CO2 + H2O is not balanced because there are four hydrogen atoms in the reactant side of the equation and only two on the product side. for balancing this equation we add 2 withO2 in reactants and add 2 with H2O in products.
Answer:
Chromium is reduced in forward reaction
Explanation:
A species is said to be oxidized if oxidation number of the species increases.
A species is said to be reduced if oxidation number of the species decreases.
Oxidation number of Cr in 
= +6
Oxidation number of Cr in 
= +3
So change in oxidation number of Cr in forward reaction = (+3)-(+6) = -3
Hence oxidation number of Cr decreases on going from to .
So, chromium is reduced in forward reaction.
Answer:
The diameter of red blood cell 
Explanation:
1 in = 2.54 cm
So, 
=
Hence the diameter of red blood cell
Answer: Option (d) is the correct answer.
Explanation:
Properties that are unable to bring any change in chemical composition of a substance are known as physical properties.
For example, size, shape, volume, density, boiling point, melting point etc is a physical property.
Whereas properties that bring change in chemical composition of a substance are known as chemical properties.
For example, combustion, toxicity, reactivity etc are all chemical properties.
Thus, we can conclude that a physical property is a property the sample displays without changing its composition.
Bases
A base is a substance that dissociates into more hydroxide ions (-OH-) when dissolved in water. Bases are also good proton acceptors. Bases, therefore, reduce the number of H+ and increase OH- hence raising the pH of the solution.
B(aq) + H₂O(l) ⇌ BH⁺(aq) + OH⁻(aq)
Explanation:
Other properties of bases is that they are bitter to the taste and they feel slippery when touched. Strong bases are nonthlese very corrosive like acids. Bases turn red litmus paper blue. Most alkali hydroxides such as NaOH are bases.
Learn More:
For more on bases check out;
brainly.com/question/12574229
brainly.com/question/2015251
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