Nêu và giải thích hiện tượng trong các thí nghiệm sau a. Sục khí cacbonic từ từ đến dư vào dung dịch nước vôi trong
b. cho dung dịch bari clorua vào dung dịch natri sunfat
c. Nhúng 1 đinh sắt sạch vào dung dịch đồng sunfat
d. Cho vài lá đồng nhỏ vào dung dịch axit sunfuric đặc đun nóng nhẹ
e. Cho Na lần lượt vào từng dung dịch sau AlCl3 NH4Cl FeSO4 Ba(HCO3)2

What changes occur in the reaction indicated by the equation? check all that apply. the hydrogen nucleus loses protons. the oxygen nucleus gains protons. the bond in h2 is broken, and new bonds are formed between hydrogen and oxygen atoms. each electron associated with a hydrogen atom is shared with an oxygen atom.

What is the difference between covalent bonds and ionic bonds? covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between charged atoms. covalent bonds involve the transfer of electrons between charged atoms; ionic bonds involve the sharing of electrons between atoms. covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms. covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between charged atoms.

Why is it important for scientists to review and repeat the work of other scientists? 1.a scientific theory must be tested three times before it is proven. 2.the scientific method only applies to repeated experiments. 3.an experiment may have had errors that the scientists didn't recognize. 4.the results of individual scientists may be influenced by bias. 5.an experiment must be performed twice before the data can be analyzed.