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 particlesParticles 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 cellsNeed 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 systemRibs 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: WindTemperature 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