Chemical bonds

When is an ionic bond formed?

• when electrons are shared

• when protons are shared

• when oppositely charged atoms gain or lose electrons

• when oppositely charged atoms gain or lose a proton

What are the smallest basic units of matter?

• molecules

• atoms

• elements

• 7th graders

Tags

NGSS.MS-PS1-5

Atoms that share electrons are

• in a covalent bond

• in an ionic bond

• are usually salts

• always metals

_{What particle is found in the nucleus and has no charge?}

• electron
• neutron
• proton
• atom

Tags

NGSS.MS-PS1-1

What is an example of an element?

• Carbon

• Oxygen

• Water

• Salt

Element, compound, or mixture?

(a)  

Tags

NGSS.MS-PS1-1

How many electrons are in a full outer shell?

• 8

• 6

• 7

• 5

Which statement best describes a mixture?

• Contains 1 type of atom that is not chemically bonded to any other atoms.

• Contains 2 or more types of atoms that are chemically bonded together.

• Contains 2 or more types of atoms that are not chemically bonded together.

• Contains at least 3 types of atoms that are not chemically bonded together.

What is the difference between a molecule and a compound?

• Molecules are larger than compounds

• Molecule is more generic and can include elements in which two or more of the same atom are chemically bonded

• Compounds always contain carbon and hydrogen whereas molecules can contain other elements

• Compounds contain chemical bonds whereas molecules do not have any chemical bonds

Tags

NGSS.MS-PS1-1

What is a bond?

• Permanent link

• Linking atoms to existing compounds

• Only formed between atoms

• A lasting attraction

Tags

NGSS.MS-PS1-5