2024 Physical Science Fall Final Exam

Front

What is the balanced equation for the reaction of magnesium (Mg) with hydrochloric acid (HCl)?

Back

Mg + 2 HCl -> MgCl2 + H2

Front

What is a dot diagram and how is it used to represent elements?

Back

A dot diagram shows the valence electrons of an atom as dots around the element's symbol. For example, fluorine (F) has 7 valence electrons represented as 7 dots.

Front

What state of matter has a fixed shape and volume?

Back

Solid

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

In which state of matter do molecules move freely and completely fill their container?

Back

Gas

Front

What is the chemical formula for water?

Back

H2O

Front

How many molecules of HCl are needed to balance the equation: Mg + __ HCl -> MgCl2 + H2?

Back

2

Front

What is the definition of a molecule?

Back

A molecule is a group of two or more atoms bonded together.

Front

What is the state of matter where molecules are closely packed but can slide past each other?

Back

Liquid

Front

What is the term for a substance that cannot be broken down into simpler substances?

Back

Element