Show:
Phases and Classes
Atom and Periodic Table
Energy
Motion and Forces
Waves
100
Describe oxygen at room temperature.
It is in the gas state. No definite volume and no definite shape.
100
What is the purpose of the zigzag line on the periodic table?
Divides metals from nonmetals - elements that fall along the line are metalloids and share properties of both.
100
What does the law of conservation of energy state?
The amount of energy in a closed system remains the same. Energy is not created or destroyed but can change form.
100
Why would it be important for a downhill skier to have her skis sharpened and waxed before every race?
Reduces friction - oppositional force. Will allow the skier to move at a faster rate.
100
Why would a radio not work well in space?
Sound is a mechanical wave and cannot travel through empty space. You would not be able to hear the radio in space.
200
What class does NaCl is described under?
Na and Cl are chemically combined making a compound.
200
What do you know about elements in the same column?
Share similar chemical properties - ex valence e- etc.
200
What energy conversion takes place as a matchstick is lit?
CPE to light, heat
200
If you throw a baseball and a bowling ball with the same force describe what will happen to their acceleration.
The baseball would have a greater acceleration. Newton's 2nd law- less mass will accelerate more than an object with more mass.
200
Describe the relationship between frequency and wavelength.
The higher the frequency the shorter the wavelength.
300
Which two classes of matter are considered to be “pure” substances?
Elements and Compounds Mixtures are not pure.
300
What do you know about the noble gases?
They are inactive (inert) and have a full outer energy level. (8 e-)
300
Describe the conversion of KE and PE on a roller coaster.
Top of the hill - max PE. Moving down the hill - increasing KE Bottom of the hill - Max KE Moving up the next hill - increasing PE
300
What does the gravitational force between two bodies depend upon?
mass and distance Bigger the bodies are and closer together they are the greater the gravitational pull.
300
Explain which material would allow sound to travel the fastest: steel, water, air.
Steel - sound travels the fastes in a solid. The particles are closer together.
400
What is the biggest difference between chemical and physical changes?
Chemical changes create a new substance with a new identity. Physical can change appearance but doesn't give it a new identity.
400
What charge does an atom get when it gains or loses an electron?
Gains electrons - negative charge Loses electrons - positive charge
400
How does thermal energy get transferred when you hold an ice cube in your hand?
Heat moves from your hand to the ice cube. From an area of higher temp to an area of lower temp.
400
What 3 ways can you accelerate?
Change in velocity: Speed up Slow down Change in direction
400
Explain how rainbows are produced.
Light refracts as it moves through the water droplets and bends allowing the white light to separate into ROYGBIV.
500
What does the law of conservation of matter describe about reactants and products in a chemical equation?
Amount of matter remains the same. Matter in reactants = Matter in the products
500
Name 2 properties of metals and nonmetals.
Metals - good conductors; malleable, ductile, hard, usually solids at room temperature Nonmetals - good insulators, brittle mostly gases
500
In a pot of boiling water where would convection, conduction and radiation occur?
Conduction - where the pot touches the stove. Convection - as the water heats and the steam rising Radiation - Feeling the warmth from the pot.
500
Name two out of the three ways machines can make work easier.
1. Multiplies the effort force (mechanical advantage). 2. Less effort over a greater distance (ramp). 3. Changes the direction of the effort force. (Fixed pulley)
500
Describe how light enters the eye.
Cornea - clear outer covering. Through the pupil. Through the lens where it is refracted and displayed on the retina.