How many protons, neutrons and electrons are present in an atom of hafnium, hf, with a mass number of 178?

1. Copper (II) hydroxide is converted into copper (II) oxide by heating the test tube containing Cu (OH) 2 in a hot water bath. Is it necessary to use distilled water in this water bath

Hexane combusts in the presence of oxygen to produce carbon dioxide and water. 2C6H14 + 19O2 → 12CO2 + 14H2O How many atoms, total, are reacting in this equation?

Which has the most thermal energy? A cup of water at 10°C or a lake at 10°C

How do you measure for acidity or alkalinity?

Which feature of four different marine fossils makes the fossil organism most similar to the present-day organism with four limbs?

If an atom has an atomic number of 15 and an atomic mass of 31, how many protons, neutrons and electrons does the atom contain?

What is formed when sediment is blown against an obstacle and settles behind it

Compared to the radius of a chlorine atom, the radius of a chloride ion is (1) larger because chlorine loses an electron (2) larger because chlorine gains an electron (3) smaller because chlorine loses an electron (4) smaller because chlorine gains

What do you think made the blizzard so dangerous?

If 6 moles of a compound produce 84 J of energy, what is the a Hreaction in J/mol?