Question

name: samie gonzalez
date: sep 8 2025
properties of water: amoeba sisters

water has the shape shown below.
label the positive and negative ends of the molecule.
image of water molecule

circle the correct answer.
water is a polar / nonpolar molecule.
the formula for water is ______.
this means there are:
______ hydrogen
______ oxygen

when two water molecules connect, they bond through ______ bonds.
label the bonds below.
image of water molecules with bonds

adhesion:
water molecules stick to other surfaces.
give one example:
image of a plant stem with water

cohesion:
water molecules stick to ______
example: water droplets form one larger droplet.

surface tension:
cohesive properties of water allow the surface to resist breakage.
give one example:

water as a solvent:
water is very good at dissolving substances.
what are two substances that dissolve in water?

freezing water:
circle one:
water expands / contracts when it freezes.
this is typical / not typical of most liquids.
this causes ice to sink / float.

water has a high specific heat:
specific heat is the amount of heat required to raise the temperature of a unit mass of a given substance by a given amount (such as 1 degree).
circle t (true) or f (false)
water resists changes to heat. t or f
water changes temperature rapidly. t or f

evaporative cooling:

Explanation:

To solve the questions related to the properties of water, we analyze each section:

1. Water Molecule Structure and Polarity

• Polarity: Water is a polar molecule (oxygen is more electronegative, creating partial charges).
• Formula: \( H_2O \) (2 hydrogen, 1 oxygen atoms).
• Bond Between Molecules: Hydrogen bonds (due to attraction between partial + of H and partial - of O in adjacent molecules).

2. Adhesion, Cohesion, Surface Tension

• Adhesion Example: Water sticking to the sides of a glass tube (capillary action) or to plant cell walls.
• Cohesion Example: Water droplets forming (molecules stick to each other), like raindrops.
• Surface Tension Example: Insects (e.g., water striders) walking on water, or a needle floating if placed carefully.

3. Water as a Solvent

• Substances Dissolving in Water: Ionic compounds (e.g., NaCl, table salt) and polar molecules (e.g., sugar, \( C_{12}H_{22}O_{11} \)).

4. Freezing Water

• Expansion/Contraction: Water expands when it freezes (unlike most liquids which contract).
• Typical/NOT Typical: Not typical (most liquids contract on freezing).
• Sink/Float: Ice floats (because expanded ice is less dense than liquid water).

5. High Specific Heat

• Resists Heat Changes: True (high specific heat means it takes a lot of energy to change temperature).
• Changes Temperature Rapidly: False (high specific heat means slow temperature change).

Answer:

s to Specific Questions (from the Worksheet):

• Water is a (polar/nonpolar) molecule: Polar (circled correctly in the image).
• Formula for water: \( H_2O \) (filled correctly).
• Hydrogen atoms in \( H_2O \): 2 (filled as "2" in the image).
• Oxygen atoms in \( H_2O \): 1 (filled as "1" in the image).
• Bond between water molecules: Hydrogen (filled in the image).
• Adhesion Example: E.g., water climbing up a paper towel, or capillary action in plants.
• Cohesion Example: Water droplets merging (as given: "Water droplets form one larger droplet" is correct).
• Surface Tension Example: E.g., a paperclip floating on water (if placed gently) or water forming beads on a waxed surface.
• Substances Dissolving in Water: E.g., Salt (NaCl) and Sugar (\( C_{12}H_{22}O_{11} \)).
• Freezing Behavior:
• Expands (circle "expands").
• Not typical (circle "not typical").
• Floats (circle "float").
• High Specific Heat:
• "Water resists changes to heat": T (True, circle T).
• "Water changes temperature rapidly": F (False, circle F).

For clarity, here’s a summary of key answers:

• Polarity: Polar
• Formula: \( H_2O \)
• Hydrogen: 2, Oxygen: 1
• Intermolecular Bond: Hydrogen
• Adhesion Example: Water sticking to a glass tube (capillary action)
• Cohesion Example: Water droplets merging
• Surface Tension Example: Water striders on water
• Solvent Substances: Salt, Sugar
• Freezing: Expands, Not typical, Floats
• Specific Heat: T (resists), F (rapid change)