How many electrons does the element with Z=12 have in its valence shell? Write t

Question

How many electrons does the element with Z=12 have in its valence shell? Write the electron-dot symbol for this element. Carbon is the element of life. What is the mass ( in amu ) of a single carbon-12 (^12_6C) atom? What is the mass (in grams) of a mole of Carbon? How many protons,neutrons, and electrons are in neutral carbon - 12 atom? Carbon is an excellent source of energy. When we burn cabon (e.g. in the form of firewood ) is this reation endothermic or exothermic? Explain in 1-2 sentences. Is buring the carbon in firewood a physical change or a chermical change? Explain in 1-2 sentences. The burning of a log in oxygen is a spontaneous process, yet a log can be stored for a long time without spontaneously burning. In 1-2 sentences explain why this is.

Explanation / Answer

16

a)   single carbon atom = 12 amu

b) one mole of Carbon atom = 12 gram

c) a neutral single carbon atom has

protons = 6

neutrons = 6

electrons = 6

d) its a exothermic reaction , it releases energy due to formation of CO2 and water

e) its both physical and chemical change, beause chemically CO2 and water are formed

where as solid goes to gases and liquid so physical also

f) A spontaneous process also requires ignition because there is a energy barrrier to overcome.

Once the energy barrier is overcome , it will be self driven that is spontaneous.

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