Hoà tan 4,4g fes vào 73g dd hcl 10%
a) tính khối lượng dd sau pứ
b) tính nồng độ % dd đó

The melting point of sulfur is 115 °c and its boiling point is 445 °c. what state would sulfur be in at 200 °c?

Draw the lewis dot structure for each of the following polyatomic ions

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules