STAAR Review Units 1, 2 (23)

Front

How many valence electrons does Iodine have?

Back

7

Front

How many atoms of carbon (C) are in C6H12O6?

Back

6

Front

Which way do periods go on the periodic table?

Back

Left to right

Front

Which letter represents the electron cloud/energy shell?

Back

S

Front

What indicates that a chemical reaction has occurred?

Back

Evidence includes a precipitate, color change, or temperature change.

Front

What is a valence electron?

Back

A valence electron is an electron in the outermost shell of an atom that can participate in forming chemical bonds.

Front

What is the chemical formula for glucose?

Back

C6H12O6

Front

What is the significance of the periodic table's periods?

Back

Periods indicate the number of electron shells in the elements.

Front

What is a chemical reaction?

Back

A process where substances (reactants) are transformed into different substances (products).

Front

What is a precipitate?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.