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41 Cards in this Set
- Front
- Back
protons have this charge |
positive |
|
electrons have this charge |
negative |
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neutrons have this charge |
neutral |
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neutrons are located in the |
nucleus |
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protons are located in the |
nucleus |
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electrons are located in the |
clouds or orbitals |
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a group of atoms linked by covalent bonds is called a(n) |
molecule |
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When one atom gives/transfers its electron it is called a(n) _________________ bond |
ionic |
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When two atoms share an electron within the same molecule it is called a(n) ______________ bond. |
covalent |
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This type of bond occurs between two DIFFERENT water molecules |
hydrogen |
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When looking at a graph/chart the first thing you look at is the _____________. |
title |
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A hypothesis must contain these two things |
independent and dependent variable |
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Control groups are the group where the ____________ is not used |
independent variable |
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A valid experiment will have all things _____________________ except for ____________ |
constant, one |
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With new observations and information, models and hypotheses will be ___________________. |
modified/changed |
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Oxygen has a __________ charge. Hydrogen has a _________________ charge. |
negative, positive |
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A neutral atom has a(n) _______________ amount of protons and electrons |
equal/same |
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Ionic bonds have a positive and negative end, this means that they are _______________ |
polar |
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Water is polar because it has a slight ____________________ at each end of the molecule. |
charge |
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There are ________ oxygens and _________ hydrogens in each water molecule |
1 , 2 |
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Water is a polar substance and this allows for water to dissolve other polar substances like ___________________ compounds. |
ionic (salt!) |
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Water is a great solvent because it _______________ other molecules |
dissolves |
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Water can hydrogen bond because of this property |
polarity |
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Water dissolves molecules like sugar and salt which are important nutrients that cells need to survive. Which property of water is this? |
Universal Solvent |
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If water did not have this property, life could not exist |
Universal Solvent |
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What property explains why water molecules are "sticky" |
cohesion |
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Why is cohesion important for life? |
Allows plants to transport water from roots to leaves/branches |
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What property of water allows for surface tension? (small insects to stand on water) |
Cohesion |
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Small insects can stand on water because ____________________ create a bridge between the molecules. |
hydrogen bonds |
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Water has a pH of __(#)___ which is _____________. |
7, neutral |
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Most biological reactions take place at a _________________ pH |
neutral |
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Density is how ____________ molecules are to each other |
close |
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Water becomes more dense as it gets _________ |
colder |
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Ice floats because it is _____________ dense than liquid water |
less |
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Ice is less dense than liquid water because __________________________________ |
hydrogen bonds form a pattern and spreads out the molecules (less close together = less dense) |
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The density of water/ice is important to life because _________________________________________. |
Lakes and ponds freeze from top to bottom, which creates insulation against the cold |
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Water has a high specific heat which means it takes more _______________ to heat up water than other liquids |
energy |
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Water has a high specific heat because a lot of energy is needed to break ______________________________. |
hydrogen bonds between DIFFERENT molecules |
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This property of water is the reason that seasons change gradually. |
High Specific Heat |
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This property is why coastal areas and beaches have moderate temperatures (doesn't change drastically) |
High Specific Heat |
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See specific heat, think ____________________! |
Resist temperature change! |