TEST REVIEW: ALL CHEMISTRY!

Attractions between water molecules are called

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds

Tags

NGSS.MS-PS1-1

Acids have more what? 

• OH ions 
• OH- ions
• H+ ions 
• All of the above 

What is the atomic mass for this element?

• 6

• 12.0107

• 6.0107

• 18.0107

Tags

NGSS.HS-PS1-1

What is the property of water is shown in the picture?

• specific heat

• universal solvent

• capillary action

• surface tension

Tags

NGSS.HS-ESS2-5

What property of water is shown in the picture?

• surface tension

• capillary action

• universal solvent

• specific heat

Tags

NGSS.HS-ESS2-5

Why could you float a paperclip on the water?

• The paperclip is less dense than the water so it floats

• The surface tension of the water holds the paperclip up

• The water is adhesive to the paperclip and supports it

• The paperclip is hydrophobic so the water repels it to the surface

Which property is MOST important for so many drops of water fitting on the penny? (multiple properties were involved - which is MOST influential?)

• surface tension of the water

• cohesion of water to itself

• adhesion of water to the penny

• Repulsion of water from the metal of the penny

What makes a molecule polar?

• Equal sharing of valence electrons
• Unequal sharing of valence electrons
• Stealing of electrons
• Temporary charges that come and go

When water evaporates:

• It splits into Hydrogen and oxygen atoms which are normally gases

• The polar covalent bonds within a water break allowing it to vaporize

• The hydrogen bonds between water molecules are broken so it can vaporize

• Surface molecules reach the boiling point of 100^oC and become vapor

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Covalent bonds form when

• atoms share electrons

• atoms transfer electrons

• atoms share protons

• atoms transfer protons

Tags

NGSS.HS-PS1-2