What kind of changes are permanent and alter the identity of a substance

Name an element that has properties similar to those of Chlorine. Don't need to explain

How many phases are in a homogeneous mixture?

How can people protect themselves from hazardous weather?

Structure of hydrochloric acid

Which of the following is the strongest acid? HCl, H2S, Cl2, H2O

Compared to the radius of a chlorine atom, the radius of a chloride ion is (1) larger because chlorine loses an electron (2) larger because chlorine gains an electron (3) smaller because chlorine loses an electron (4) smaller because chlorine gains

What do you think made the blizzard so dangerous?

If 6 moles of a compound produce 84 J of energy, what is the a Hreaction in J/mol?

If you were traveling through space and landed on a different planet, how might your mass and weight compare to their values on Earth? Why?

Which principle explains why it is necessary to have safety belts in cars?