8th Grade First Semester Mid-term Exam

Element

Atom

Molecule

Substance

Solution

Solvent

Dissolution

Solute

Solvent

Solution

Dissolution

Solute

Surface Tension

Polarity

Capillary Action

Specific Heat

Water is polar and can dissolve more substances than any other liquid

Solutes are not polar molecules

Water is made up hydrogen and oxygen atoms

Water has a neutral pH

Waters ability to stick to other materials

Waters ability to stick to itself

Covalent bonds in water

Capillary Action

The smallest part of an element that is a basic unit of matter

The unit measure of an element

Elements that make up molecules

Neutrons in the nucleus

Micelles are clusters of soap molecules that move to the surface so that their polar hydrophilic ends are pointed toward the water and the non-polar hydrophobic ends stick out. The bubbles ‘sit’ on the surface of the water, because the surface of the bubble is covered with the non-polar (hydrophobic) layer.

Micelles cluster on the hydrophobic ends of water molecules so that their polar heads can trap oil and dirt.

Micelles cluster on the hydrophilic ends of water molecules so that their nonpolar tails can trap oil and dirt.

Micelles are clusters of soap molecules that ‘sit’ below the surface of the water so that their hydrophobic tails stick into the water solution.

The number of protons and the number of electrons in an atom are always equal.

The number of protons is always greater than the number of electrons in an atom.

The number of protons is always less than the number of electrons in an atom.

The number of protons and electrons equals the mass of an atom.

Ionically bonded electrons

Electrons in the outer most cloud of an atom

A negatively charge ion

A positively charge ion

Hydrogen has an atomic number of one and is unsatisfied when the outermost orbital is unfilled. A hydrogen molecule of two hydrogen atoms is more stable than two individual hydrogen atoms

Hydrogen has an atomic number of two and does not need to share

Hydrogen usually combines with other atoms to form covalent bonds

Hydrogen has one proton and is in search of one neutron

A mixture of liquids that do not dissolve in each other. One liquid is suspended within the other liquid.

When one liquid repels another and is neutral.

When a solute dissolves in a solvent.

When a liquid solidifies.

How many electrons are in a valence.

The strength of an atoms' electrons.

The electrical charge of a polar molecule.

The exchange of electrons in ionic bonding.

The H2 symbol represents two atoms of Hydrogen.

The H2 symbol represents a Hydrogen atom.

The H2 symbol represents a water molecule.

The H2 symbol represents an ionic bond.

The e- represents the covalent Hydrogen electron bond in this Hydrogen molecule.

The pair of e- represents the double covalent Hydrogen electrons in the Hydrogen molecule.

The pair of e- represents the ionic Hydrogen electrons in this Hydrogen molecule.

The e- represents a single shared Hydrogen electron in this Hydrogen molecule.

Hydrogen bonds are non-polar because electrons in the bonds between identical atoms (H-H) are shared uniformly. This means electrons spend equal amounts of time around each atoms center.

Hydrogen bonds are non-polar because protons in the bonds between identical atoms (H-H) are shared uniformly. This means electrons spend equal amounts of time around each atoms center.

Hydrogen bonds are non-polar because protons in the bonds between identical atoms (H-H) are not shared uniformly. This means electrons do not spend equal amounts of time around each atoms center.

Hydrogen bonds are non-polar because protons and electrons in the atom of identical atoms (H-H) are shared uniformly. This means electrons do not spend equal amounts of time around each atoms center.

As altitude increases, air becomes less dense and the air pressure decreases. The water would not shoot out of the container.

As altitude increases, air becomes more dense and the air pressure decreases. The water would not shoot out of the container.

As altitude increases, air becomes more dense and the air pressure increases. The water would shoot out of the container farther than in the classroom.

As altitude increases, air becomes less dense and the air pressure increases. The water would shoot out of the container farther than in the classroom.

Ben Franklin accurately measured the thickness of a single-molecule thick layer of olive oil on water.

Ben Franklin accurately measured the pollution in the pond water caused by the olive oil.

Ben Franklin accurately measured the change in surface tension when olive oil was added to the pond.

Ben Franklin accurately measured the area of underwater visibility created by altered surface tension when oil was added to water.

Adhesion

Cohesion

Surface Tension

Polarity

Solute

Solution

Solvent

Insoluble

Capillary Action

Polarity

Surface Tension

Specific Heat

Gravity

Density

Volume

Air Pressure

If the holes were larger, the volume of water flowing is greater, but slower with less pressure.

If the holes were larger, the volume of water flowing is less, but faster with more pressure.

If the holes were larger, the volume of water flowing is greater, faster and with more pressure.

If the holes were larger, the volume of water flowing is greater, faster and with less pressure.

Water comes out of the container faster, is under greater pressure and there is less volume of water in the flow.

Water comes out of the container faster, is under less pressure and there is greater volume of water in the flow.

Water comes out of the container slower, is under greater pressure and there is less volume of water in the flow.

Water comes out of the container slower, is under less pressure and there is less volume of water in the flow.

It breaks the polarity and therefore the surface tension

Liquid detergent is not soluble

It changes the pH

It changes the specific heat