Physical Science - Unit 1 intro to Chem

Front

What is the symbol for the element Chlorine?

Back

Cl

Front

Protons have a ______ charge.

Back

positive

Front

Change from liquid to gas is called....

Back

evaporation

Front

What is a physical change?

Back

A reversible change that does NOT change the identity (chemical formula) of a substance.

Front

Particles (molecules) in a ______________________ have more energy than the other states of matter.

Back

gas

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed.

Front

What is an endothermic reaction?

Back

A reaction that absorbs energy from its surroundings.

Front

What is an exothermic reaction?

Back

A reaction that releases energy to its surroundings.