Chemistry review

Front

Which elements have 1 valence electron?

Back

Group 1 elements, also known as alkali metals, have 1 valence electron.

Front

In the equation 2Mg + O2 ---> 2MgO, which are the reactants?

Back

The reactants are Mg (magnesium) and O2 (oxygen).

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Front

What are the UP and DOWN columns on the periodic table called?

Back

They are called groups.

Front

Protons are equal to:

Back

Protons are equal to the atomic number of an element.

Front

What are the SIDE TO SIDE rows on the periodic table called?

Back

They are called periods.

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Tags

NGSS.MS-PS1-5

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 an ion?

Back

An ion is an atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Tags

NGSS.MS-PS1-5