Exploring Matter and Atoms

What is an element?

• An element is a mixture of different atoms.

• An element can be broken down into simpler substances.

• An element is a type of molecule made of two or more atoms.

• An element is a pure substance made of only one type of atom.

Name three properties of metals.

• Non-magnetic (do not attract magnets)

• Poor conductors of electricity

• 1. Good conductors of electricity and heat 2. Malleable (can be shaped) 3. Ductile (can be drawn into wires)

• Brittle (easily breakable)

What distinguishes a molecule from a compound?

• A molecule is always made of two or more different elements.

• A compound can consist of the same elements only.

• A molecule is a type of compound that contains only one element.

• A molecule can consist of the same or different elements, while a compound specifically consists of different elements.

Give an example of a compound.

• Oxygen (O2)

• Water (H2O)

• Sodium Chloride (NaCl)

• Carbon Dioxide (CO2)

How is the periodic table organized?

• The periodic table is organized by increasing atomic number and grouped by similar properties.

• Organized by color and shape

• Sorted by the number of electrons in each atom

• Arranged randomly without any order

What does the atomic number represent?

• The total mass of an atom.

• The number of neutrons in an atom.

• The number of protons in an atom.

• The number of electrons in an atom.

Which element has the atomic number 1?

• Helium

• Carbon

• Hydrogen

• Oxygen

What is the chemical symbol for gold?

• Au

• Pb

• Ag

• Fe

How many elements are in the periodic table?

• 115

• 100

• 120

• 118

What is the difference between a chemical symbol and a chemical formula?

• A chemical symbol represents a mixture, while a chemical formula represents a single substance.

• A chemical symbol represents an element, while a chemical formula represents a compound.

• A chemical symbol is a formula for a compound, while a chemical formula is a symbol for an element.

• A chemical symbol is used only in organic chemistry, while a chemical formula is used in inorganic chemistry.