The Structure of Water
What is the chemical formula for water?
H2O
Name 2 properties of water.
Capillary action, surface tension, universal solvent, or specific heat.
What are the 3 states of water?
Solid, liquid, and gas.
What is the percentage of salt water on Earth?
97%
In which step of the water cycle does water return to earth surface?
-Precipitation.
What elements can be found in water?
Hydrogen and Oxygen.
What causes rain drops to form round beads when they fall onto a car windshield?
Surface Tension.
In which state do the molecules move the slowest? And the fastest?
Slowest: solid Fastest: gas
Water that fills the cracks and spaces in underground soil and rock layers is called ______________.
Groundwater.
What major steps of the water cycle are run by gravity?
Runoff & precipitation.
What is water and all other matter made up of?
Atoms
The substance that does the dissolving is called the __________.
Solvent.
The process by which a gas changes to a liquid is called _________.
Condensation.
True or False. Far more fresh water is found in lakes and rivers than underground water.
False.
Water that falls to earth as rain, snow, hail or sleet is called _____________.
Precipitation.
What makes water a polar molecule?
The positive & negative areas of the molecule.
What is responsible for water's unusual properties?
The attraction among the polar water molecules is responsible for the water's unusual properties.
What is the only substance on Earth that commonly exist in 3 different states?
Water.
What's the percentage of fresh water underground?
30%
The process when water is given off through leaves as water vapor is called _____________.
Transpiration.
Is it true? The negative hydrogen ends with 1 water molecule attracts the positive oxygen ends of near by water molecules.
False. The positive hydrogen ends with 1 water molecule attracts the negative oxygen ends of near by water molecules.
The amount of heat needed to increase the temperature of a certain mass of a substance by 1℃ is ___________.
- Specific heat.
1. Water moves between the liquid and gaseous states by ___________and____________.
2. Water moves between the liquid and solid states by ___________and____________.
1. Evaporation and condensation. 2. Freezing and melting.
True or False. The 3% of Earth's freshwater is available for human to use.
False.
Name 5 parts of the water cycle.
Evaporation
Condensation
Precipitation
Runoff
Accumulation