Understanding Models in Chemistry

What is a model in scientific terms?

• A representation of something else

• A mathematical equation

• A three-dimensional object

• A type of chemical reaction

Tags

NGSS.MS-LS1-2

NGSS.MS-PS1-1

NGSS.MS-PS3-2

What does the ball-and-stick model represent?

• Energy levels in atoms

• Electron movement

• Chemical reactions

• Atoms and bonds in molecules

What is the main limitation of the ball-and-stick model according to the video?

• It does not differentiate between the nuclei and the electron cloud

• It does not show where electrons interact in bonding

• It represents atoms as too large

• It is too complex

What rule is often mentioned when discussing Lewis structures?

• The octet rule

• The duplex rule

• The electron rule

• The quantum rule

Which element is an exception to the octet rule, as mentioned in the video?

• Oxygen

• Hydrogen

• Carbon

• Nitrogen

What does a Lewis structure not typically show?

• Ionic bonds

• Inner electrons

• Covalent bonds

• Valence electrons

What did early scientists originally think was the reason atoms combined?

• Because of their smell

• Because of their size

• Because they were sticky

• Because of their color

Who described a covalent bond as atoms sharing electrons?

• Niels Bohr

• Gilbert Newton Lewis

• Isaac Newton

• Linus Pauling

Tags

NGSS.HS-PS1-1

What major advancement did Linus Pauling contribute to the field of chemistry?

• The quantum mechanics model of bonding

• The color coding of chemical bonds

• The invention of the periodic table

• The discovery of protons

According to the video, what is the maximum number of covalent bonds that can exist between two atoms?

• Three

• Four

• Five

• Two