Waves
Water Cycle
Variables
Matter & Reactions
Heat Transfer
1
What are the two types of waves?
Mechanical and Electromagnetic
Longitudinal and Transverse
1
What is the gaseous form of water?
water vapor
1
What are the types of variable in an experiment?
Independent, dependent and constant.
1
Name three ways to know that a chemical reaction has occurred.
Bubbles form
Color change
Temperature change
Solid forms
1
In what direction does heat flow?
Heat flows from high to low.
2
Name an example of each type of wave.
Mechanical Wave - Sound wave
Electromagnetic Wave - Light wave
2
Which process is represented by A?
Evaporation
2
What is a constant?
What the scientist keeps the same
2
What is the difference between open and closed systems?
Open systems allow matter and energy to flow through the system whereas closed system doesn't allow matter to flow, only energy.
2
What kind of sample is represented in the diagram below?
Mixture
3
What is a medium? Name an example of each.
A medium is matter that allows waves to travel through. Examples of mediums are gas, water and rock.
3
Water is cycles by?
The Sun.
3
What is the difference between independent and dependent variables?
Independent variables - what the scientist is changing
Dependent variable - what the scientist is measuring
3
What is the difference between a physical and a chemical changes?
Physical changes alters the appearance but the identity of the substance changes. Chemical changes alter the identity of the substance
3
Describe the 3 states of matter on the particle level.
Solid - Particles are closely packed together and vibrating.
Liquid - Particles are flowing over each other.
Gas- Particles move freely.
4
Name the parts of the waves
The parts of the wave are crest, trough, wavelength and amplitude.
4
What are the major processes of the water cycle?
Evaporation, precipitation, condensation.
4
Trevor wanted to find out what fertilizer worked best for growing marigolds. He put Miracle Grow on one, Scotts fertilizer on one, and no fertilizer on another. Name the independent and dependent variables.
The independent variable is the fertilizer. The dependent variable is the growth of the plant.
4
Identify the following as chemical or physical changes
melting candle wax
burning wood
boiling water
boiling an egg
melting candle wax: Physical Change
burning wood: Chemical Changes
boiling water: Physical Change
boiling an egg: Chemical Changes
4
What is the difference between a pure substance and mixture?
A pure substance is made up of once substance whereas a mixture is made up of two or more substances.
5
Why can we see the sun but we cannot hear it?
Space is a vacuum therefore sound waves require a medium to travel through, however, light waves can through through a vacuum
5
Precipitation falls back to Earth in what form?
rain, sleet, snow, hail
5
Darius wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were added before each test flight. As each paper clip was added, the plane was tested to determine how far it would fly. Name the independent and dependent variables, and constant.
The independent variable is the mass of the airplane. The dependent variable is the distance the plane will fly. The constant is the type of paper.
5
Name 3 chemical and 3 physical properties
Chemical: flammability, toxicity, reactivity, oxidation
Physical: mass, volume, color, odor, density
5
Explain heat transfer on a particle level.
The fast moving particles hit the slow moving particles. Upon collision the energy is transferred from the fast moving particles to the slower moving particles.