Unit 2 Review

Contains only one kind of atom.

• Element
• Compund
• Mixture

Contains two or more atoms combined

• Elements
• Compounds
• Mixtures

Is sugar (C₁₂H₂₂O₁₁) an element or a compound?

• Element
• Compound

Which of the following is not a compound?

• HCl
• Cl
• NaCl
• CO2

How do covalent bonds form?

• Donating & receiving valence e- between atoms.
• Opposite slight charges attract each other between compounds.
• Scientists are still not sure how they form.
• Sharing valence e- between atoms.

Ionic Bonding is the _________ of electron/s between atoms.

• sharing

• transfer

• loose

• gain

Which particle is responsible for bonding?

• Electrons

• Protons

• Nucleus

• Neutrons

What two elements make up water?

• Helium and oxygen
• Hydrogen and oxygen
• helium and carbon
• oxygen and carbon

What word describes when water is attracted to other substances?

• cohesion
• adhesion
• capillary action
• surface tension

Why does water move from the roots to the leaves of plants?

• Water is pushed by solutes

• Capillary action pulls the water molecules up like a chain

• Water is pulled by gravity

• Water cannot move up roots to leaves