This is how sodium appears in the periodic table. An orange box has N a at the center and 11 above. Below it says sodium and below that 22.99. A blue arrow points to 22.99.

The arrow is pointing to sodium’s

number of neutrons.
chemical symbol
atomic mass
combined number of electrons and protons.

If you add 10ml of hot water to 10ml of cold water and the change in tempature 8°c calculate how much energy is gained by the cold water

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.

Can someone me with 1 to 4 plz. fast