Intro to Bonding

What is a compound?

• Two or more atoms of the same element combined

• Two or more elements physically combined

• Two or more elements chemically combined

• Two or more cheeses on a sandwich

Elements form compounds to be ___________

• unstable

• ordinary

• stable

• different

To be stable, an atom follows the ________ in order to have ____ electrons in their outer energy shell

• octet, 6

• octet, 8

• duplo, 2

• duplo 8

What is the chemical formula for ammonia?

• NH3

• H2O

• CO2

• O2

Tags

NGSS.MS-PS1-1

Which of the following is NOT true about ionic compounds?

• metal + nonmetal

• high melting points

• doesn't conduct electricity in water

• forms hard, brittle crystals

Ionic bonds are formed by ____________________.

• a transfer of electrons from a metal to a nonmetal

• a transfer of a electrons from a nonmetal to a nonmetal

• the sharing of electrons between a metal and nonmetal

• the sharing of electrons between a nonmetal and nonmetal

Which of the following compounds represents is not an ionic bond?

• NaCl

• NO₂

• NaOH

• BaBr₂

Tags

NGSS.HS-PS1-3

Which of the following is a property of ionic compounds?

• high melting and boiling points

• low melting points

• usually insoluble in water

• doesn't conduct electricity in water

What does the subscript in a chemical compound represent, such as the "2" in H₂O?

• the charge of that element

• the number of protons for that element

• the number of valence electrons for that element

• the number of atoms for that element

Metals ____________ electrons, and nonmetals __________ electrons when they become ions.

• lose, gain

• gain, lose

• lose, share

• share, share

Tags

NGSS.HS-PS1-2