A substance is matter that has a definite composition.

TRUE or FALSE?

Why is tin foil a good inslator

Is dissolving salt a chemical change or physical change and why?

Which physical state of matter exhibits the greatest change in volume with changes or temperature or pressure?

What is the molar mass of Ca (ClO4) 2? 171.6 g/mol 203.6 g/mol 239.0 g/mol 279.1 g/mol

How did the ice ages affect where people settled in America

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?