A property that can be observed without changing the substance into another substance is a(n)___phyiscal property. A property that usually
requires changing the substance into another substance to be observed is a(n)___
property

Melting 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.

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?