Is the air that we breathe an element, compound, mixture, or pure substance? Element
Pure substance
O Mixture
Compound

1. combine iron and copper (ii) sulfate solution. (hint: iron will form the iron (iii) ion) fe + cuso4 → 2. combine lead (ii) nitrate and potassium iodide solutions. pb(no3)2+ kl → 3. combine magnesium metal and hydrochloric acid solution. mg + hcl → 4. electrolysis (splitting) of water. h2o → 5. burning magnesium. mg + o2 →

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.