Chemistry Semester 1 Exam Practice

Front

What is the electron dot structure for Fluorine?

Back

The electron dot structure for Fluorine shows 7 valence electrons represented as dots around the symbol 'F'.

Front

Who developed the Bohr model of the atom?

Back

Niels Bohr developed the Bohr model of the atom.

Front

What is a chemical property of sodium?

Back

A chemical property of sodium is that it reacts with water to form hydrogen gas and sodium hydroxide.

Front

What is an example of a homogeneous mixture?

Back

Sweet tea is an example of a homogeneous mixture.

Front

In what ratio do elements from columns B & E combine?

Back

Elements from columns B & E combine in a ratio of 3B:2E.

Front

What are 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 difference between a physical property and a chemical property?

Back

A physical property can be observed without changing the substance's identity, while a chemical property describes how a substance reacts to form new substances.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that retain their individual properties.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of elements organized by increasing atomic number, showing periodic trends.

Front

What is an atom?

Back

An atom is the smallest unit of an element that retains the properties of that element.