Exam 2: Atoms and Molecules

The average relative mass of an ozone molecule is 48.0 u.An ozone molecule contains only oxygen atoms.What does this molecular weight indicate about the formula of the ozone molecule?

Calcium supplements can be taken in 1,000 mg increments.

What is the meaning of the two (2)in ethyl alcohol,C₂H₅OH?

The symbols for all of the elements always begin with a capital letter.

Electrons do not make an important contribution to the mass of an atom.

Neutral isotopes of the same element have the same number of electrons.

What is meant when the symbol C-12 (or ¹²C)is used?

An isotope of gallium consisting of 31 protons and 37 neutrons can be represented using the symbol shown below.

What is the molar mass of Ba₃(PO₄)₂?

What is the mass number of a carbon-13 (¹³C)atom?

What is the number of hydrogen atoms in a 18.016 gram sample of water?

How many atoms are contained in a sample of krypton,Kr,that weighs 8.38 g?

Which of the following particles is the smallest?

Which of the following has the largest mass?

An MRI instrument cause the hydrogens in your body to line up because they are exposed to a very strong magnetic field.

How many silicon atoms (Si)are contained in a 12.5 g sample of silicon?

A mole of copper contains the same number of atoms as a mole of zinc.

The mass of mercury (Hg),a liquid at room temperature,is 200.6 amu/mol.A 200.6 gram sample of mercury is heated until it boils.What is the mass of one mole of mercury vapor (gas)?

How many electrons are in a neutral atom of carbon-13 (¹³C)?

One mole of an element would weigh the same as a mole of an isotope of the same element.