Section: Water
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What type of bond does H20 form? | Polar Covalent.
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| What happens in a polar covalent bond? | The electrons shared between the atoms are closer to the nucleus of the more electronegative atom. In water, the electrons tend to stay near the oxygen atom.
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| What region of water is slightly positive, and which is slightly negative? | Oxygen: slightly negative. Hydrogen: slightly positive.
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| How do water molecules bond with each other? | Hydrogen bonds.
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| Which bond is stronger: polar covalent or hydrogen? | Polar Covalent. Hydrogen bonds are constantly breaking, forming, and reforming.
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| What can happen when 2 water molecules dissociate? | The partial charges formed when the bonds break and reform can form 1 hydronium ion (H3O+) and 1 hydroxide ion (OH-).
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| What kinds of unique properties does water posses? | Cohesion, adhesion, surface tension, the ability to dissolve many other materials (universal solvent), and the ability to expand upon freezing, high specific heat, able to moderate the temperature of surrounding air.
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| What is cohesion? | The attraction of two like materials. This refers to the binding of hydrogen bonds that hold water molecules together.
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| What is adhesion? | It can stick (through hydrogen bonds) to other substances.
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| What is surface tension? Does water have a high or low surface tension? | Surface tension refers to measure of the enhanced inter-molecular forces at the surface of a liquid. Water has a high surface tension.
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| What type of solvent is water? | Water is referred to as the universal solvent. Many substances on earth can dissolve in water.
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| What happens when water freezes? | It expands upon freezing, making ice less dense than liquid water.
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| What is specific heat? Does water have a high or low specific heat? | Specific heat is the amount of heat, expressed in calories, needed to raise one gram of a substance by 1°C. Water has a high specific heat.
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| What states of matter can water be found in? | Solid, liquid, and gas.
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| What is the water cycle? | Evaporation, condensation, precipitation, and transpiration.
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| What are the main sources of energy for the water cycle? | The sun and gravity.
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Created by:
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