Two chemical reactions are shown: 2Mg + O2 → 2MgO
CaCO3 → CaO + CO2
Which statement is true? (5 points)

a
Both are synthesis reactions.

b
Both are decomposition reactions.

c
A is a synthesis reaction, and B is a decomposition reaction.

d
A is a decomposition reaction, and B is a synthesis reaction.

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons

If 16.00g of hydrogen gas reacts with 126.73g of oxygen, how many grams of water are yielded? (both reactants are completely consumed in the reaction.)