Nếu trộn 3 phần sắt một phần lưu huỳnh hỗn hợp chuyển sang màu nào

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

Mg-26 and mg-24 are pair of isotopes. isotopes are defined as atoms of the same element having same atomic number but different mass number. i hope that was .