eQuizShow

Science 8 Review

Mix and Flow of Matter

Question: A fluid is defined as...
Answer: A Liquid or a Gas that flows and takes the shape of its container.

Question: In a saltwater solution, what is the solvent? What is the solute?
Answer: Water, salt

Question: What are the four principles of the Particle Model of Matter
Answer: All matter is made up of tiny particles
Particles are always moving
Particles have space between them
Particles are bonded and attracted to one another


Question: The technology used to determine whether a substance is a pure substance or a solution is called...
Answer: Paper Chromatography

Question: A. The amount of solute that dissolves in a specific amount/type of solvent, at a specific temperature is known as...

B. If no more solute can be dissolved in a solvent at a given temperature, the solution is said to be __________________.


Answer: solubility, saturated

Cells and Systems

Question: The command centre of the cell is ____________. The energy centres of the cell are ________________.
Answer: Nucleus, mitochondria

Question: There are six characteristics that all living things (organisms) have...

List 5 of them

Answer: All made of cells
Need energy
Grow and develop
Respond to the environment
Reproduce
Have adaptations to their environment


Question: Osmosis is a type of diffusion in which water molecules move from an area of __________ concentration to _________ concentration.
Answer: high, low

Question: A. What body system is responsible for the exchange of gases?

B. When yo exhale, your ribs _________________ and your diaphragm __________________.

Answer: Respiratory system
Ribs go down, diaphragm goes up



Question: Contractions of muscle tissues that line the esophagus in order to move food toward the stomach is called ______________.
Answer: Peristalsis

Light and Optics

Question: The law of reflection states that the incident angle and the angle of reflection are...
Answer: equal

Question: A. What are the structures in the eye that are responsible for black and white vision?





Answer: Rods

Question: Objects that give off light are known as ____________, objects that allow some light to pass through are known as ____________, objects that allow all light to pass through are known as __________, and objects that allow no light to pass are known as ____________.
Answer: luminous, translucent, transparent, opaque

Question: When light travels from a less dense medium into a more dense medium, the light ray will travel ___________ from the normal?
Answer: toward

Question: If light refracts through a convex lens, the rays will _____________ (converge/diverge/go straight).  If light is reflected off a convex mirror, the rays of light will ___________ (converge/diverge/go straight).
Answer: converge, diverge

Mechanical Systems

Question: A force that reduces the mechanical advantage of all machines is called...
Answer: friction

Question: What is the force on a piston  whose pressure is 500 Pa and the area of the piston is 2.5 m squared?
Answer: 1250 Newtons

Question: Calculate the efficiency of the following device:
Input Force = 100N
Output Force = 850 N
Input Distance = 3 M
Output Distance = 30 cm

Answer: 85%

Question: In a closed piston system...
The input piston measures - 20 cm squared
The output piston measures - 120 cm squared
If the output piston pushes up with a force of 600 N, what amount of force will need to be applied to the input force?

Answer: 100N

Question: In a gear system, if the driving gear is smaller than the driven gear, it is known as ______________.  If the driving gear is larger than the driven gear, it is known as ____________.
Answer: reducing, multiplying

Water Systems

Question: An area of land that drains into a body water such as a river, lake or ocean is called...
Answer: a watershed

Question: What are the two phases involved in the distillation of water?
Answer: Evaporation and Condensation

Question: A change in ocean currents is one of the key indicators of climate events.  Currents are streams of water that move within a larger body of water. They can. Be caused by four different factors.  List three of them.
Answer: Wind
Temperature differences in the water
Salinity differences in the water
Earth's rotation


Question:

A. The highest point on a continent which determines the direction of watershed flow.

B. These are small hills with adistinctive teardrop shape. They form when a glacier moves over moraines that had formed earlier.


Answer: Continental Divide, Drumlins

Question: The main affect that large bodies of water have on the climate of a particular area is...
Answer: it prevents extreme temperate/weather changes