Chemical Bonds Unit Test

In an ionic bond, electrons are ​ (a)   from the ​ (b)   to the ​ (c)   . Ionic bonds are ​ (d)   because of the big difference in electronegativity.

• transferred
• metal
• nonmetal
• strong
• weak
• semimetal
• shared

Match the following to form true statements:

• high melting and high boiling points

• There are many strong bonds

• cannot conduct electricity

• When solid, ionic compounds (think about movement -energy of ions in a solid state)

• can conduct electricity

• Ionic compounds have

• between ions in an ionic compound.

• When melted ionic compounds

• with a charge of 1+

• Elements in group 1 of the periodic table form ions

Tags

NGSS.MS-PS1-4

If an atom ​ (a)   electrons, it will become negative.

If an atom ​ (b)   electrons, it will become positive.

• gains
• loses
• destroys
• creates

Match the following

• charge of an atom

• ionic

• transfer of electrons

• reactivity

• ability to undergo chemical reactions

• oxidation state

• sharing of electron pairs

• covalent

• energy level of an electron

• valence electron

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Ionic bonds are formed by transferring an electron from a ​​ (a)   to a ​ nonmetal.

• metal
• metalloid
• nonmetal

CaCO₃ represents a chemical

• Symbol
• Formula
• Subscript
• Reaction

Tags

NGSS.MS-PS1-1

The _______ describes the atoms in a compound.

• chemical equation
• chemical formula
• chemical symbol
• coefficient

Tags

NGSS.MS-PS1-1

The chemical formula of potassium iodide is

• KI
• PI
• KI₂
• K₂I

Tags

NGSS.MS-PS1-1

What is a chemical formula?

• a mathematical formula that is used to describe a substance

• an equation to determine the types of atoms in a substance.

• an idea that has a lot of evidence that many scientist have gathered over a long time.

• letters and numbers showing the types and numbers of atoms that repeat to make up a substance

Tags

NGSS.MS-PS1-1

Which statement best explains why elements form compounds and what most elements need to achieve this, and identifies elements that do not tend to form compounds?

• Elements form compounds to achieve stable electronic configurations, usually by completing their outer electron shells. Noble gases do not tend to form compounds because they are already stable.

• Elements form compounds to increase their atomic mass. All elements tend to form compounds.

• Elements form compounds to reduce their reactivity with water. Metals do not tend to form compounds.

• Elements form compounds to change their physical state. Non-metallic elements do not tend to form compounds.