Front

Can a mixture be separated?

Back

Yes, mixtures can be separated by physical means such as filtration, distillation, or chromatography.

Front

What happens to oxygen when it forms an ion?

Back

Oxygen has six valence electrons and will gain two electrons to achieve a full outer shell, resulting in a charge of -2.

Front

What is a pure substance that is a compound?

Back

A pure substance that is a compound consists of two or more different elements chemically bonded together, such as water (H2O) or carbon dioxide (CO2).

Front

Identify the name of the compound Ag3(PO3)2.

Back

The compound Ag3(PO3)2 is named silver (II) phosphite.

Front

How many neutrons does the isotope of lithium have if it has a mass number of 8?

Back

The isotope of lithium with a mass number of 8 has 5 neutrons (8 - 3 protons = 5 neutrons).

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

Define valence electrons.

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

What is the charge of an ion formed by gaining electrons?

Back

The charge of an ion formed by gaining electrons is negative.

Front

What distinguishes a pure substance from a mixture?

Back

A pure substance has a uniform and definite composition, while a mixture contains two or more substances that retain their individual properties.

Front

What is the formula for calculating neutrons in an atom?

Back

The number of neutrons can be calculated using the formula: Neutrons = Mass number - Atomic number.