A physical change occur when a

A. bracelet turns your wrist green

B. Peach spoils

C. Glue gun Melts a glue stick

D. Copper bowl tarnishes

Inside stars in space, the nuclei of hydrogen atoms fuse together to form helium atoms. This represents which form of energy?

An isotope has a half-life of 10 minutes. after 20 minutes, what percentage of the original nuclei remain?

1. How many liters of chlorine gas, at standard temperature and pressure, will react with 15.5 grams of potassium metal? Show all of the work used to solve this problem 2 K + Cl2 yields 2 KCl 2.

How do you indicate that a substance is a solid in a chemical ecuation?

Which explains why carbon is a component of so many elements? A. It appears in more than one form B. It is the most abundant element C. It can react with both metals and nonmetals D. It can form stable compounds with other elements

Do all liquids freeze at the same rate

Convert 1.67 x10^24 atoms of carbon to moles of carbon

The knowledge of chemistry not important in one of the following? A, in agriculture B, in Geology C, in medicine D, none

Which is the balanced equation for: Al2O3 + Fe - Fe3O4 + AL

Why are lab apparatus made of ceramics