What is the mass number of an atom having 16 protons and 13 neutrons?

A neutralization reaction involves the reaction of an acid with a base. A base reacts faster with nitric acid than with acetic acid. Which statement explains why? A. Nitric acid is a strong acid, and acetic acid is a weak base. B.

Which of the following is NOT an example of a molecule A: H2O2 B:NCI3 C:F D:O3

Which group of elements are considered to be in the same family? A. helium, neon and argon B. potassium, calcium and scandium C. manganese, iron and cobalt D. hydrogen and helium

What is the concentration of OH - in pure water at 298k

Ling decided to do a science project on exercise. She wanted to find out how long it takes for a person's heart rate to slow down to normal after exercise. Which of the following was likely the scientific prediction Ling made about her project? A.

In a laboratory, Carlos places one plate with grape jelly and another plate with cooked brown rice inside an ant farm. The next day, he finds that both plates are filled with ants.

Which statement is true at STP? (The atomic mass of Zn is 65.39 u.)

A sample of gas has a volume of 2.4 L and a pressure of 1.2 atm. What would the pressure of the same gas sample be if the volume is reduced to 1.8L at a constant temperature?

The elements most likely to form more than type of ion are the ... A. Transition metals B. alkali metals C. halogens D. alkaline earth metals

Mole-Mass Conversions How many moles in 28. o grams of Oxygen? What is the mass of 5.0 moles of Iron? Find the number of moles of argon in 452 g of argon. Find the grams in 16.5 mol of Hydrogen.