Physics
Which type of energy is stored up, and increases when the distance above ground increases?
Potential
What is the unit for energy?
JOULE
Give an example of a chemical change (reaction)
Random Answers that may include: Burning stuff, changing the molecules permanently
x5
Frozen orange juice is place in a bowl. After a few minutes it begins to melt. What type of change has occurred?
a. chemical
b. melting
c. physical
d. mixture
c. physical
x4
A student wanted to look at pond water to see what organisms they could find. Which of the following tools would the student use?
a. balance b. graduate cylinder
c. microscope d. magnifying glass
c. microscope
What are the PRODUCTS of photosynthesis?
oxygen and glucose (sugar)
What does the Law of Conservation of Mass say?
Matter is never created or destroyed, but transformed into a different form.
x3
Which of the following is a physical change?
a. lighting a match b. rusting metal
c. baking a cake d. making koolaid
d. making koolaid
Random answers that may include: bending, cutting, or melting something, but not changing the molcules in a permanent way.
How many hydrogen atoms are in 4 molecules of NH4?
16
Why do scientists often say that photosynthesis is the opposite of respiration?
x3 points
The products of respiration are the reactants of photosynthesis and vice versa.
What are the reactants of respiration?
Glucose and Oxygen
What is the energy of motion called?
Which has more energy: a 50 kg rock or a 100 kg rock?
100 kg rock because more mass=more energy!
What is the name of this common molecule?
C6H12O6
Glucose
Which of the following are physical properties?
density
melting point
flammability
explosive
reactivity
density and melting point
Where do all living things on the earth originally get their energy from?
The sun
What occurs at the boiling point of a substance?
a. the substance changes from a gas to a solid
b. the substance changes from a liquid to a solid
c. the substance changes from a solid to a liquid
d. the substaqnce changes from a liquid to a gas
What type of potential energy is food or fuel?
chemical potential
C6H22O6
34
What are the 7 evidences of a chemical change?
X5 points
Odor
Color
Precipitate
Gas
Temperature change (sometimes light and sound)
Look at a periodic table to find this answer...
How many protons are in an atom of carbon?
x3 points
6
What are the reactants of photosynthesis?
x3 points
Carbon dioxide, water, and sunlight
x6
Which is an example of a chemical change?
a. melting ice
b. dissolving salt in water
c. hammering metal into a thin sheet of foil
d. burning a piece of paper
d. burning a piece of paper
x5
You moved a goldfish bowl , a book and a flower vase from the floor to the 3rd shelf. What type of potential energy does each object have?
a. elastic potential
b. gravitational potential
c. chemical potential
d. kinetic potential
b. gravitational potential
Which list correctly identifies the elements that make up a water molecule?
a. oxygen, hydrogen, nitrogen
b. oxygen, hydrogen, carbon
c. oxygen, hydrogen, oxygen
d. hydrogen, oxygen, hydrogen
d. hydrogen, oxygen, hydrogen
How many atoms of hydrogen are in 3 molecules of H2O?
6
Which of these is a molecule?
NaCl (salt)
H2O (water)
Aluminum
Oxygen
NaCl (salt) and H2O (water)
Which of these is NOT a greenhouse gas?
water vapor
carbon dioxide
methane
oxygen
oxygen
x2 Points
In which situation is a chemical reaction not taking place
a. salt dissolving in water
b. rusting of an old car in a junk yard
c. burning gasoline in a car
d. digestion of food in our body
a. salt dissolving in water
x 6
Tom tosses a spring in the air. What type of energy does the spring have?
a. elastic and chemical
b. chemical and gravitational
c. gravitational and elastic
d. gravitational and physical
c elastic and gravitational
x2
Which material is a pure element or atom?
a. alcohol
b. copper
c. salt
d. water
b. copper
Which of the following is the LARGEST atom?
Hydrogen
Oxygen
Lithium
What is the name of this molecule?
CO2
Carbon Dioxide
What is the process by which plants make energy from the sun?
photosynthesis
x 7
What is evaporation?
a . gas turns to liquid
b. solid turns to liquid
c. liquid turns to gas
d. water turns to ice
c. liquid turns to gas
A person jumps out of an airplane and does not deploy his/her parachute. Which type of energy is increasing as he/she falls towards the ground?
kinetic is increasing and potential is decreasing
Through which phase of matter does sound travel fastest?
solid
What is the formula for carbon dioxide?
CO2
What is the charge of a neutron?
neutral=no charge
What is the process by which your body gets energy in every cell?
Cellular Respiration
Which color of light is the WORST for shining on plants so they can do photosynthesis?
GREEN! Because plants reflect green light, that's why we see them as green. If they reflect green, they are not using that light as energy.
Is this an example of a molecule or an atom?
Gold
atom