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Unit 3.1

QuestionAnswer
What property of water is shown in the diagram? Adhesion
What property of water is shown in the diagram? Cohesion
For a polar molecule to bond with another polar molecule: The partial positive would have to bond with the other molecules partial negative
Which subatomic particle is involved in the creation of poles in a polar molecule? Electrons
Which atom has a partial positive charge in H2O? Hydrogen
Which atom has a partial negative charge in CH2O? Oxygen
Why are bonds polar? Differences in electronegativity
What is a polar covalent bond? Electrons are shared unequally
In a polar bond, the more electronegative atom will have a Partial negative charge
The longer it takes a substance to evaporate, the higher the heat of the evaporation rate needs to be, the stronger the intermolecular force True
Your refrigerator is overheating and you can feel heat coming off of the appliance. The molecules near where the refrigerator is overheating are: Gaining thermal energy
Freon circulates through a refrigerator to keep the food cold. You can feel heat coming from the bottom of the refrigerator often. What does this indicate in terms of energy? An increase in temperature indicates an increase in KE to the particles of Freon in the system as energy is absorbed.
What is electronegativity? Amount of pull for an electron
nonpolar covalent bond electrons are shared EQUALLY
polar covalent bond results in a molecule that has poles
polar covalent bond electrons are shared UNEQUALLY
Covalent bonds are created by... sharing electrons
Ionic bonds are created by... transferring electrons
Electrons in the outermost energy level; responsible for an element's chemical properties valence electrons
Why are bonds polar? Differences in electronegativity
In a polar bond, the more electronegative atom will have a Partial negative charge
How does electronegativity change as you go ACROSS a period from left to right? increases
What type of bond is between two C atoms? nonpolar covalent
Polar covalent molecule A molecule that has an uneven distribution of electrons, resulting in slight charges within the molecule itself
What type of bond is between P and Cl? polar covalent
What type of bond is between K and I? ionic
Which atom has a partial negative charge in CH4? There are no partial charges because these bonds are considered nonpolar
What type of bond is between O and H? polar covalent
Which of the element is the most electronegative? Fluorine
What is electronegativity? Amount of pull for an electron
nonpolar covalent bond covalent bond in which the bonding electrons are shared equally by the bonded atoms
The bond between C and O is polar covalent. Which element pulls the electrons closer and why? O because it is more electronegative
The bond between C and Cl is polar covalent. Which element pulls the electrons closer and why? Cl because it is more electronegative
What Has The Highest Viscosity Honey or water? Honey
Viscosity is... The resistance of a substance to flow
Which of the following is an example of adhesion? Water sticking to a car windshield.
Water forms together into drops due to... Cohesion
In water, the hydrogens have a slightly _______ charge. Positive
This property explains why oceans stay relatively the same temperature: Specific heat
It takes more energy to heat up water than oil. This is because water has... high specific heat
When the water balloon was held over the flame it did not pop because the water did not get hot enough. This is because of its... high heat capacity
Water sticking to the windshield is an example of... Adhesion
What is polar molecule? Having a positively and negatively charged ends
What does solid Ice do in liquid water? Float
What is the water molecule made up of? 2 hydrogen 1 oxygen
water being attracted or sticking to other particles Adhesion
Water moving upward through a narrow tube. This is an example of... Capillary action
Water molecules are held together by... hydrogen bonds
Why is the density of water so important for the aquatic life in a lake during the winter? The lake freezes from the top down since ice is less dense than liquid water. This protects the aquatic life below.
water being attracted and sticking to other water molecules, like a magnet Cohesion
Which of the following is an example of capillary action? A plant getting water from its roots to its leaves.
Substances like oil, waxes and fats do not dissolve in water. They are... Nonpolar substances
____________________ molecules do not dissolve in water. Nonpolar
What is suface tension? Water appears to have a “skin” on the surface because water molecules stick to each other (cohesion)
In water, oxygen has a slightly _______ charge. Negative
Which two properties of water allow it to travel up the roots and stems of plants in the process of capillary action? adhesion and cohesion
the tightness on the top layer of water due to cohesion Surface Tension
What is Surface Tension? Uneven forces acting on the particles of a liquids surface.
What property of water is shown in the picture? Capillary Action
Water having a positive side and a negative side makes it.... polar
What atoms are found in a water molecule? 2 hydrogen and 1 oxygen
Which of these properties of water allow these tall trees to survive? capillary action
What is cohesion? Attraction between water molecules that allows them to form round drops and remain at room temperature.
water being attracted or sticking to other particles Adhesion
Some fish are able to live in lakes with very cold water. Which statement describes the characteristic of water that plays an important role in allowing fish to live in these cold-water lakes? = Water at the surface of the lake freezes and forms an insulation layer
What property of water is shown in the picture? Surface tension
Solid ice is ________ dense than liquid water. Less
What property of water is shown in the diagram? Polarity
Water absorbs heat more _______________ and retains energy ______________. Slowly, Longer
_________________ enables many substances to dissolve in water Polarity
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