Is boron an element a compound a heterogeneous mixture or a homogeneous mixture?

Answer these questions based on 234.04360 as the atomic mass of thorium-234. The masses for the subatomic particles are given. Round the mass defect to the 5th decimal place. mass of a proton: 1.00728 amu mass of a neutron: 1.

What can be determined if only the atomic number of an atom is known? (1) the total number of neutrons in the atom, only (2) the total number of protons in the atom, only (3) the total number of protons and the total number of neutrons in the atom

What does the symbol ∆H stand for? the specific heat of a substance the heat capacity of a substance the heat of reaction for a chemical reaction one Calorie given off by a reaction

During the fission of uranium-235, neutrons are released and a small amount of mass is converted to energy. How many neutrons are in the nucleus of an atom of uranium-235? A. 92 B. 143 C. 235 D. 238

How many grams are there in 2.3 x 10^24 atoms of silver?

Food deteriorates more slowly in a refrigerator because

What occurs in a chemical reaction? Products are formed from reactants by the breaking and forming of new bonds. Products are formed without chemical bonds being broken. Reactants are formed without chemical bonds being broken.

What information does the atomic mass of an element provide

The following diagram represents a vertical cross section of sedimentary rock layers that have not been overturned. Which principle best supports the conclusion that these layers have undergone extensive movement since deposition?

What kind of ions do a sodium atom and a chlorine atom become when a valence electron is transferred from one to the other?