Elements, Compounds, Chemical Formulas

Front

Which of the following is NOT an element? H2O, H2, O2, Au

Back

H2O is a compound, not an element.

Front

The red numbers in a chemical equation represent ________

Back

coefficients, which indicate the number of molecules.

Front

____ is a pure substance made of only one type of atom.

Back

An element.

Front

Which element is written correctly? Cu, CU, AU, C.U.

Back

Cu is the correct representation of Copper.

Front

How many Magnesium atoms are in 10MgCl2?

Back

There are 10 Magnesium atoms.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together.

Front

What is the chemical formula for water?

Back

H2O, which consists of 2 Hydrogen atoms and 1 Oxygen atom.

Front

What does the subscript in a chemical formula indicate?

Back

The number of atoms of the element in the molecule.

Front

What is the difference between an element and a compound?

Back

An element is made of one type of atom, while a compound is made of two or more different types of atoms.

Front

What is the chemical symbol for Gold?

Back

Au.