Explain why sharpening a pencil is different type of physical change than freezing water to make ice cubes

How much salt is required to make 250g of a 5.0% saline solution?

Biology which variable is measured in an experiment? A. dependent variable B. independent variable C. experimental variable

What is having too many or too few electrons?

An Erlenmeyer flask contains 25.00 mL of 0.10 M HCl. What is the pH of the solution? -1.0 0.40 1.0 - 1.6

After the simulation opens, double click the Electromagnet tab. It shows a compass and an electromagnet. What parts make up the electromagnet?

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?