Chemistry Semester 1 Exam Review

Front

What is the formula for calculating density?

Back

Density = Mass / Volume

Front

What is the density of an object having a mass of 8.0 g and a volume of 25 cm³?

Back

0.32 g/cm³

Front

What is the main conclusion of Rutherford's gold foil experiment?

Back

The nucleus is small, dense, and positively charged.

Front

What is the atomic model proposed by Niels Bohr?

Back

Electrons travel in specific paths or orbits around the nucleus.

Front

What is the significance of Thomson's cathode-ray tube experiment?

Back

It led to the discovery of the electron.

Front

What is Avogadro's number?

Back

6.02 x 10²³, the number of atoms or molecules in one mole.

Front

What is the charge of a proton?

Back

+1

Front

What is the charge of an electron?

Back

-1

Front

What is the charge of a neutron?

Back

0 (neutral)

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom; a compound is made of two or more different types of atoms chemically bonded.