All reactions involving a change in temperature are exothermic.

a. True

b. False

What notations are commonly used to specify isotopes? what do each of the numbers in these symbols mean?

What product is formed at the positive electrode (anode) when 0.001 mol dm-3 H2SO4 (aq) is electrolysed? A. Hydrogen B. Oxygen C. Sulfur D. Sulfur dioxide

A new element - - quickly named Reachium by the scientific community - - is discovered. This element is found to have two isotopes. 86.4% of all Reachium atoms are Reachium-328 and 13.6% are Reachium-333. What is the atomic mass of this element?

Which term best indicates the average mass of an atom of an element? atomic number mass number group number atomic mass

Based on the information in the graph, which statement best applies to a gas?

To how much water should 250 mL of 12 M hydrochloric acid be added to produce a 4.0 M solution?

Which is the correct name for MgSO4•7H2O?

Iron has a density of 7.86 g/cm^3. Calculate the volume of a piece of iron having a mass of 3.99 kg.

a student determines the mass of a 100 mL beaker filled with 50 mL of water to be 154.34 grams. After a tablet reacts with the water, the mass including the dissolved tablet is 157.26 grams. Show the work and find the mass gained below.

Why does ocean water in the eye of a hurricane rise about two feet