chemical reactions grade 9

gas comes out from the thermal decomposition of copper hydroxide

• carbon dioxide

• water vapor

• oxygen

• hydrogen

..................... substitutes the hydrogen of water

• copper

• silver

• sodium

• gold

....................is the substance found inside the air bags

• nitrogen

• sodium azid

• sodium

• hydrogen

Sodium is a ........................ agent

• reducing

• oxidizing

.........................is the substance which loses an electron or more during a chemical reaction

• Reducing agent

• Oxidizing agent

.........................is the substance which gains an electron or more during a chemical reaction

• Reducing agent

• Oxidizing agent

the gas that comes out from thermal decomposition of copper carbonate

• oxygen

• carbon dioxide

• ammonia

• hydrogen

 $CuSO_4\ \ \rightarrow............+SO_3$  

• Cu

• Co

• CuO

•  $O_2$  

........................ comes after hydrogen in C.A.S

• Na

• Ca

• Ag

• Fe

chemical process that causes increase in the oxygen percentage in a substance

• Oxidation

• Reduction