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41 Cards in this Set

  • Front
  • Back

protons have this charge

positive

electrons have this charge

negative

neutrons have this charge

neutral

neutrons are located in the

nucleus

protons are located in the

nucleus

electrons are located in the

clouds or orbitals

a group of atoms linked by covalent bonds is called a(n)

molecule

When one atom gives/transfers its electron it is called a(n) _________________ bond

ionic

When two atoms share an electron within the same molecule it is called a(n) ______________ bond.

covalent

This type of bond occurs between two DIFFERENT water molecules

hydrogen

When looking at a graph/chart the first thing you look at is the _____________.

title

A hypothesis must contain these two things

independent and dependent variable

Control groups are the group where the ____________ is not used

independent variable

A valid experiment will have all things _____________________ except for ____________

constant, one

With new observations and information, models and hypotheses will be ___________________.

modified/changed

Oxygen has a __________ charge. Hydrogen has a _________________ charge.

negative, positive

A neutral atom has a(n) _______________ amount of protons and electrons

equal/same

Ionic bonds have a positive and negative end, this means that they are _______________

polar

Water is polar because it has a slight ____________________ at each end of the molecule.

charge

There are ________ oxygens and _________ hydrogens in each water molecule

1 , 2

Water is a polar substance and this allows for water to dissolve other polar substances like ___________________ compounds.

ionic (salt!)

Water is a great solvent because it _______________ other molecules

dissolves

Water can hydrogen bond because of this property

polarity

Water dissolves molecules like sugar and salt which are important nutrients that cells need to survive. Which property of water is this?

Universal Solvent

If water did not have this property, life could not exist

Universal Solvent

What property explains why water molecules are "sticky"

cohesion

Why is cohesion important for life?

Allows plants to transport water from roots to leaves/branches

What property of water allows for surface tension? (small insects to stand on water)

Cohesion

Small insects can stand on water because ____________________ create a bridge between the molecules.

hydrogen bonds

Water has a pH of __(#)___ which is _____________.

7, neutral

Most biological reactions take place at a _________________ pH

neutral

Density is how ____________ molecules are to each other

close

Water becomes more dense as it gets _________

colder

Ice floats because it is _____________ dense than liquid water

less

Ice is less dense than liquid water because __________________________________

hydrogen bonds form a pattern and spreads out the molecules (less close together = less dense)

The density of water/ice is important to life because _________________________________________.

Lakes and ponds freeze from top to bottom, which creates insulation against the cold

Water has a high specific heat which means it takes more _______________ to heat up water than other liquids

energy

Water has a high specific heat because a lot of energy is needed to break ______________________________.

hydrogen bonds between DIFFERENT molecules

This property of water is the reason that seasons change gradually.

High Specific Heat

This property is why coastal areas and beaches have moderate temperatures (doesn't change drastically)

High Specific Heat

See specific heat, think ____________________!

Resist temperature change!