Iodine, I2 , undergoes sublimation if it is heated under normal atmospheric pressure. Is sublimation a physical or chemical change?

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.