Water Walk QuizTime Lets see what you know

Water Walk… Quiz-Time Let’s see what you know… A Review of Water’s… Physical & Chemical Properties GEO 487 – Fall 2017

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (1) Water contracts (gets smaller) when it freezes. False Water expands when it freezes and becomes less dense unlike most other substances.

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (2) Long legged bugs called “water striders” can skate along the surface of a body of water because: b. The attraction is called The hydrogen of onea Hydrogen bond the water molecule is and attracted result is thatofwater to the oxygen another molecules demonstrate water molecule like “cohesion” oppositecausing poles ofwater a to havemagnet a “strong surface” are! called “surface tension”.

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (3) Condensation is water coming out of the air. True When water vapor cools it takes up less space and contracts, allowing Recent research has uncovered water molecules to stick that most condensationtostarts on one another forming the surfaces of airborne bacteria! clouds and precipitation.

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (4) More things can be dissolved in a strong acid than in water. False The movement of liquid water along with its ability to form hydrogen bonds, allows water to pull substances apart and dissolve them better but not always faster than acids!

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (5) Rainwater is the purest form of water. False Precipitation of any kind (snow, rain, hail) contains dissolved minerals, gases, acids, dust, pollen grains, viruses and microorganisms! Distilled water is the purest!

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (6) It takes more energy to heat cold water to 212 o F (100 o C) than it does to change “boiling” water at 212 o F (100 o C) to steam. False It takes 5 x as much energy to turn boiling water into steam than it takes to raise cool water to boiling point @ 212 o F. !

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (7) Water is the most common compound on Earth’s surface. True or False More then 70% of Earth is covered in water. 66% of our bodies are made of water. Answer could depend upon what you mean by ‘common’.

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (8) Sea water is slightly more alkaline or basic (the p. H value is higher) than most natural fresh water. True Neutral water (such as distilled water) has a p. H of 7, which is in the middle of being acidic and alkaline. Sea water happens to be slightly alkaline (basic), with a p. H of about 8. Most natural water has a p. H of between 6 -8, and acid rain can have a p. H as low as 4.

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (9) Falling raindrops are tear-shaped. False A drop of water coming out of a faucet, does have a tear shape… until it can't hold on any longer. But when it falls it look more like a small hamburger bun due to the interplay between gravity and surface tension. As a drops falls, the air below the drop pushes up from the bottom, causing the drop to flatten out somewhat.

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (10) Water boils & evaporates more quickly at high altitude than at the sea level. True o. F or 202 7, 800 ft @ 212 o. F At sea level water boils at 100 o C. At 2, 400 m, water boils at 92 o C. This is because as the altitude gets higher, the lower air pressure makes it easier for the water molecules to break their bonds and attraction to each other and, thus, it boils more easily.

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (11) Water is the only substance that is found naturally on Earth in three forms: liquid, gas, solid. True Water can commonly be seen in the solid, liquid and gaseous states on Earth.

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (12) Water can be compressed like air. False A water-filled syringe on a stand is loaded with weights to show the incompressibility of water. Water is slightly compressible.

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (13) Water is known as the universal _______. c. solvent A substance that has the ability to dissolve both bases and acids, such as water, is called a “universal solvent. Everything else dissolves in water as well. . . stone, iron, pots, pans, plates, sugar, salt, and coffee beans.

Water Walk… Quiz A Review of Water’s… Physical & Chemical Properties (14) Water we drink cannot be easily broken down or made. It has essentially stayed the same since the beginning of time, and has been used and reused by all life forms! True & False Hydrolysis Rnx Condensation Rnx New water is being formed At right, amino acids, the all the time. Dihydrogen Monoxide building blocks of protein, are is also always being broken being into “digested” (top), and down Hydrogen requiring the. However, breakdown Oxygen gas. mostofof the water through the water, andcycling being combined Earth and its living things stays (bottom), creating water in the same, largely unchanged. process!