EMEQ and Chemical Changes

Front

What do subscripts in a chemical formula indicate?

Back

The number of atoms bonded together of that element.

Front

Which of the following is NOT an indicator of a chemical change?

Back

Change of state.

Front

What are neutrons?

Back

Particles that hang out in the nucleus, have no charge, and don't significantly affect the properties of the atom.

Front

How many oxygen atoms are in 4Ca(OH)₂?

Back

8.

Front

How many elements are in the compound C₂H₈O?

Back

3.

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances.

Front

What is the role of protons in an atom?

Back

Protons determine the atomic number and identity of an element.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance without changing its identity, while a chemical change results in the formation of new substances.

Front

What is a precipitate?

Back

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

Front

What does the term 'reactants' refer to in a chemical reaction?

Back

The starting substances that undergo change during the reaction.