Properties of Water

What two elements make up water?

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

Tags

NGSS.MS-PS1-1

A water strider can skate along the top of a pond because:

• covalent bonds result in water cohesion
• hydrogen bonds result in water cohesion (surface tension)
• water striders have adapted to take advantage of water cohesion
• low surface tension of water

What word(s) describes when water is attracted to other substances?

• cohesion only 
• adhesion and cohesion 
• capillary action
• surface tension

Tags

NGSS.MS-ESS2-4

Why can water have no net charge but have slight charges in different parts of the molecule?

• The oxygen end is slightly negative and the hydrogen end is slightly positive
• The hydrogen end is slightly negative and the oxygen end is slightly negative 
• The hydrogen and oxygen ends change in polarity
• Because it is hydrophobic

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

• Water is pushed by solutes
• Cohesion and adhesion work together in capillary action to pull the  water molecules like a chain
• Water is pulled by gravity
• Water’s cohesion causes it to “pull” towards the leaves

What type of bonding takes place with the elements that make up water?

• Nitrogen bonds
• Ionic bonds
• Polar bonds
• Hydrogen covalent bonds

The attraction that causes water and other similar liquids to form drops on thin films is called ________________. This is also water’s ability to be attracted to other water molecules, so they can be united and form a whole. 

• adhesion
• capillary action
• cohesion
• surface tension

Why does ice float?

• As water freezes, it expands and its density decreases.
• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Water is polar because...

• The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.
• The molecule has two poles, at which the it is colder than other regions of the molecule.
• The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight negative charge near its oxygen atom.
• The water molecule is neutral.

Water droplets take a united or spherical shape (as pictured) because of ____________

• adhesion
• cohesion
• capillary action
• solubility