7th Unit 1 Review 2024

What is an element?

• A substance that cannot be broken down into simpler substances

• A mixture of two or more substances

• A compound made of different atoms

• A solution of metals

How are elements organized on the periodic table?

• By increasing atomic number

• By decreasing atomic mass

• Alphabetically by name

• By date of discovery

What is a chemical symbol?

• One or two letter that represents a chemical element

• A type of chemical reaction

• A formula that shows all the atoms in the molecule

• One letter that names the atom

A chemical symbol is one or two letters representing an element. Match the chemical symbol with the correct element:

• Helium

• H

• Lithium

• Be

• Beryllium

• He

• Hydrogen

• Li

How many known elements are there on the periodic table?

• 118

• 120

• 115

• 113

What are the building blocks of matter?

• Atoms

• Molecules

• Cells

• Compounds

Can an element be broken down into a simpler substance?

• Yes

• No

• Sometimes

• Depends on the element

Match the particle with its charge:

• Neutral

• Electron

• Negative

• Proton

• Positive

• Neutron

What is a compound?

• A substance formed from two or more elements chemically bonded together

• A mixture of different substances

• A single element in its pure form

• A physical combination of two or more substances

A chemical formula is:

• Shows what elements and how many of those elements are in the molecule

• A detailed description of a chemical reaction

• A list of chemical properties of a substance

• A method for measuring chemical quantities