In the reaction 2nacl + 2h2o → 2naoh + c12 + h2, the reactants should: weigh more than the products because the reaction isn't perfect. weigh less than the products because mass is lost. weigh the same as the products. weigh more because cl2 and h2 are gases.

D

Explanation:

Tough question. Both Cl2 and H2 are gases. Everything depends on what the water is. If it's a liquid, then D is the answer. If it's a gas, then you have to be a little more careful.

2H2O = 2 * 18 = 36.

Cl2 = 2*Cl = 2 * 35.5

Cl2 = 71

So D is still the answer.

weigh the same as the products.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

Given:

Mass of products = Mass of sodium hydroxide + mass of chlorine + mass of hydrogen = 2(40)+1(71)+2(1)= 153 g

Mass of reactants = Mass of sodium chloride + mass of water = 2(58.5)++2(18)= 153 g

Thus the total mass of reactants is equal to the total mass of products.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

i think it's c. i'm not sure but i think so.