16) The mass number of an element whose atoms have 12 protons and 13 neutrons is_

a) 12

b) 13c) 25 d) 12.5

Which statement about bases is incorrect? Select one: a. All bases contain hydroxide ions. b. All bases taste bitter. c. All bases turn red litmus paper blue. d. All bases feel slippery.

A substance is found to consist of 1.900g of silver, 0.250g of nitrogen, and 0.850g of oxygen. what is the percent by mass of oxygen in the compound?

During which stage of a scientific investigation is it most useful to organize information in graphs and tables? A. research related information B. identify a problem or need C. analyze the results D. design an investigation

What are the 3 things substances are classified as?

What are characteristics that can change without changing the identity of a substance? a) Chemical properties b) rotting properties c) physical properties b) rusting properties

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?