The number of protons in an atom of an element always equals its atomic weight.

a. True

b. False

How do I write a balanced chemical equation for the dissolution of Ca (OH) 2 (s) in pure water?

Which of the following alcohols is used antifreeze?

How many ammonium ions and how many sulfate ions are present in an 0.260 mol sample of (nh4) 2so4?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

Match the following definition to the type of solution it describes. unsaturated solution saturated solution supersaturated solution A. The amount of solute dissolved is less that the maximum amount the solution can hold. B.

How many moles of water are made from complete reaction of 1.4 moles of hydrogen gas? Given the reaction: 2H2 + O2 → 2H2O

A scientific law is 1. A university accepted conclusion based on testing 2. Always changing a new evidence is presented 3. Based on new evolving theories 4. Often debated in the scientific community 5. One step toward forming a theory

12 Two molecules of HBr collide and then form H2 and Br2. During the collision, the bonds in the HBr molecules are

If the two charges represented in the figure were brought near each other, they would a. have no effect on each other. b. repel each other. c. cause static discharge. d. attract each other.

A gas tank holds 20000 liters at 850 torr. If the temperature remains constant, what will the volume, in L, of the gas be at standard pressure, 760 torr?