Science Test One (2)

lindawang311's version from 2017-03-09 02:10


Question Answer
What is matter?.Matter is anything that takes up space and has mass.
What forms can matter have?Solid, liquid, gas.
Define atoms.Atoms are the blocks that make matter.
What are protons, neutrons, and electrons? (how they are charged)Protons (positively charged), neutrons (neutral pieces of matter), and electrons (negatively charged).
Where does each part of an atom go?Protons and neutrons make up the nucleus, while electrons travel around the nucleus.
Do all atoms have the same make-up?No. Different atoms have different numbers of protons, neutrons, and electrons.
What are molecules made of?Molecules are made of 2 or more atoms.
All of the particles of matter are in ____ _____ because they have _____.constant motion, energy
Describe the movement of particles in each form.Solid particles are held tightly in place (but still move). Particles in liquids move more freely. Particles in gases move even more freely.
How are the particles of solids, liquids and gases kept together?forces of attraction in between the particles
The addition of heat energy causes particles to ____ _____.move faster
Particles are ______ to other particles.attracted

Scientific Stuff

Question Answer
Define a scientific theory.A scientific theory is an agreed-upon explanation for an observed event. It is supported by scientific fact, and continues to explain all new observations.
Define a scientific law.A scientific law is similar to a scientific theory, but is more concrete in nature.
Define a qualitative observation.Observations made with your senses. They, alone, are not precise enough for scientific inquiry.
Define a quantitative observation.Measures quantities such as length, time, or mass.


Question Answer
Define a mechanical/heterogeneous mixture.A mixture where 2 or more substances are not physically changed. The different parts should be visible.
Define a homogeneous mixture.A mixture where 2 or more substances are physically changed. The different parts are not visible.
Define a pure substance.A pure substance exists when all particles are the same. (salt, sugar, etc)
How many mixtures can there be?9

Solution Terms

Question Answer
Solute.A substance that is dissolved in the solvent.
SolventA substance that the solute is dissolved in.
Concentration.The ratio of solute to solvent in a solution.
Dilute solutionA low concentration of a solute in a solvent (weak).
Concentrated solutionA high concentration of a solute in a solution (strong).
Saturated solutionThe highest possible concentration of a solute in a solution (no more solute will dissolve without a change in temperature or pressure).
Rate of solutionHow fast a solute dissolves in a solvent.

Rate of Solution

Question Answer
How does temperature affect the solubility of a gas in a liquid?As temperature increases, the solubility of a gas in liquid decreases.
Name 3 factors that affect the rate of solutionTemperature, agitation, and particle size.

Changing Form

Question Answer
solid to liquidmelting
liquid to gasevaporating
gas to liquidcondensing
liquid to solidfreezing
gas to solid/solid to gassublimating

Will it dissolve?

Question Answer
Olive OilNo
Carbon DioxideYes

Water Cycle

Question Answer
What is the difference between groundwater and surface runoff water?Groundwater is water absorbed by the earth. Surface runoff water is collected by bodies of water.
Would groundwater or runoff water contain more dissolved substances?Groundwater.
List 3 sources that the atmosphere gets its water.Example: Bodies of water, dead living things, vapour from living things.
Name the two (most common) states of water that can be found in clouds.Liquid and Gases.
Once water is inside living things, have they been removed from the cycle?No.
Define cycle.A repeating process where one thing changes to another.

Water and Pollution

Question Answer
What percentage of the earth's surface is covered by water?80%
What percentage of the world's water is drinkable?1%
What percentage of the entire world's fresh water is in Canada?22%
Why are Canadians worried about the supply of drinking water?The water might be freshwater, but it is not necessarily clean.
What are the 2 types of chemicals used on plants?Herbicides and pesticides
What is one type of pollution that is absorbed into the water from air that is over a lake?dioxins
Manufacturing, refining, sewage, waste disposal, farming, incineration, all...... produce substances that can, and do, become dissolved in the water.
Did air pollution exist before the appearance of humans?No. Natural things such as smoke, gas, etc. pollute the air.
Do air pollutants always fall back to the ground at the source of the pollution?No. There is wind, moving clouds, etc.
Why is acid snow such a dangerous form of acid precipitation?When all the acid snow gather up, it is a large amount of acid. When it melts, it enters the waterways. This can cause "acid shock", killing aquatic organisms.

Testing Water Quality

Question Answer
What are the four ways to determine water quality?dissolved oxygen, acidity, turbidity, hardness
Why is oxygen a factor in water quality?Aquatic organisms need oxygen in the water to survive. This is why it is an indicator of water quality.
What is the ppm of dissolved oxygen required for more aquatic organisms?5 to 6
Why is acidity a factor in water quality?Acid can be harmful to living things. It is best for water to have less acid.
What would be the pH level of a healthy lake?around 8
How do some acidic lakes neutralize the acidity?The lakes can be surrounded by rock (especially limestone), which neutralizes the acid.
Explain turbidityA measure of how cloudy the water is. Small solid particles often float in the water.
Why is turbidity a factor in water quality?If water is too cloudy, it will block sunlight. This will impact any aquatic plants, which then affects the whole ecosystem.
Explain hardness.The more dissolved minerals in the water, the "harder" it is.
How do bodies of water get hard ( ͡° ͜ʖ ͡°)?From the surrounding ground.
Why is soft water better to clean with than hard water?It doesn't lather well, and leaves stains.

Note 1 and 2

Question Answer
What is said in note 1?Some substances are only moderatley attracted to substances like water. Therefore even with the addition of heat energy, there is not a significant increase in solubility.
What is said in note 2?As temperature increases the solubility of a solid in a liquid increases.(We proved this by boiling our heterogenous mixture of sugar in water and the left over sugar on the bottom of our test tubes dissolved.

Safety in the science room

Question Answer
What are three ways you can prevent accidents in the science room?Clean up any spilled or dropped materials immediately, Never attempt unauthorized investigations, do not engage in horseplay or other careless acts.
What are three general safety issues?Learn the location and proper use of safety equipment, inform your teacher if you have ant allergies or medical conditions that you might have, the teacher must be present in the classroom before you try any new investigations
What are 4 things you need to have before an investigation?Safety glasses/goggles, broken glass container, fire extinguisher, eye-wash station(if you need to flush your eyes with water, do not wait for the teacher to give you permission, inform your teacher later)