Cho các chất sau: H₂O, KOH, Na₂O, BaO, CO₂,CO, NaOH, MgO, Al₂O. Hãy cho biết những cặp chất nào tác dụng với nhau, viết PTHH minh họa

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Need ! asap will mark 10 pts using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.