Unit 2.1 Review

The smallest particle of matter is 

• an atom
• a molecule
• a nucleus
• a proton

Elements are

• two or more bonded atoms 
• the same as molecules
• particles inside the nucleus
• one type of atom 

Two or more atoms that bond together are

• An element

• A molecule

• Always a solid

• One big atom

A chemical reaction occurs when

• A new substance is formed

• Matter is created

• Atoms are added to the matter

• All of these

True or False - A molecule can be made up of only the same types of atoms.

• True

• False

A molecule is________

• a glob of gelatinous goo
• smaller than an atom
• filled with raisons
• more than one atom bonded together

Law of conservation of matter states that

• matter is created

• matter is destroyed

• matter is neither created nor destroyed

• matter does not ever change

True or false. Law of conservation of matter means that the number of atoms of the products is more than the number of atoms in the reactants.

• True

• False

Can matter be created or destroyed?

• Yes, it can be created.
• Yes, it can be destroyed.
• No, matter is always conserved
• None of these

Tags

NGSS.MS-PS1-5

The total amount of matter (atoms) before and after a chemical reaction, remains the same.

• True

• False