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WorksheetsChapter 2.2 Review
Total questions: 28
Worksheet time: 54mins
What is a polar molecule?
(a)
What are the special properties of a water molecule?
Formation of multiple hydrogen bonds
Cohesion
Adhesion
Heat capacity
A weak hydrogen bond allows it to flow and keep temperature and pressure "normal"
TRUE
FALSE
What does cohesion cause water molecules to do?
(a)
Water is a polar molecule?
TRUE
FALSE
What does adhesion cause?
(a)
What is heat capacity?
(a)
True statements about water in living things
Living things are 60% water
chemical reactions in a water environment are the cause of everything cells do
Living things depend on water
Homogeneous matter is?
The same throughout
Particles are evenly distributed
Properties are uniform
Can be pure or a mixture
Heterogeneous matter is?
Does not look the same throughout
Particles are not evenly distributed
Properties are not uniform
ALWAYS a mixture
two or more physically combined substances
Homogeneous mixture is?
Components are evenly distributed among each other
Can not see through the component parts
Has a constant composition
A pure substance is?
A fixed (constant) composition and unique properties
contains only one type of particle
can be a element or a compound
Homogeneous (looks the same throughout)
A mixture is?
At least two physically combined substances
Homogeneous or can be heterogeneous
What does a solution consist of?
A solute (dissolves) and a solvent (does the dissolving)
Physically combined and can be physically separated
What are true statements about solutions?
Well mixed (uniform)
Single phased (homogeneous and transparent)
Can not be separated by filter if liquid
Does not separate being left standing
States of matter?
Gas in gas/ Gas in liquid/ Gas in solid
Solid in solid/ Solid in gas/ Solid in liquid
Liquid in liquid/ Liquid in solid/ Liquid in gas
Etc...
Heterogeneous mixture is?
Suspension or colloid
Components are not evenly distributed among each other
Has two or more distinct phases that are usually visible
Does not have uniform properties
Expresses Tyndall effect
Suspensions are?
A mixture where the particles are dispersed but are big enough to settle out or be filtered out (needs to be shaken before use)
Particles that are small and pass through filters
Colloids are?
Non-transparent
Uniform
Large particles
Cloudy (milky)
Stable
What is the Tyndall effect?
Is the response of an organism, a population, or a community to changes in its environment
Time goes faster the farther away you are from the earth's surface compared to the time on the surface of the earth
You can see the light beam as it passes through a colloid or suspension (scatters light)
Acids are?
Solutions that have excess of hydron ions (H+)
More H+ the more acidic the solution
Properties of acids?
Tastes sour
Conducts electricity
Corrosive (breaks down certain substances; skin, clothes, paper)
React strong with metals
Turns blue litmus paper red
Uses for acids?
Acetic acid- vinegar
Citric acid- lemons, limes, oranges, sour candy
Ascorbic acid- vitamin c
Sulfuric acid- fertilizers, steel, paint, plastics
Car batteries
What are bases/alkali?
Solutions that has excess of OH- ions
Substances that can accept hydrogen ions
Properties of a base/alkali?
Slippery to the touch, taste bitter
Turns red litmus paper blue
Corrosive (depending)
Can conduct electricity
Does not react with metals
Uses of bases/alkali?
Gives soap, ammonia, cleaning products
OH- ions react strongly with certain substances; dirt and grease
Your blood is base
What is the pH scale?
A measurement system of how acidic or basic a solution is
Ranges from 0-14 (below 7 acid; above 7 base; at 7 neutral/pure)
A change of -1 pH unit represents a tenfold (ten times) change in the acidity of the solution
What is a acid base reaction?
A reaction between an acid and a base is neutralization
A acid-base mixture is not as acidic or basic as the individual starting solutions
