Science review 1
Which type of energy is stored up, and increases when the distance above ground increases?
Potential
Give an example of a chemical change (reaction)
Random Answers that may include: Burning stuff, changing the molecules permanently
Random answers that may include: bending, cutting, or melting something, but not changing the molcules in a permanent way.
Is this an example of a molecule or an atom?
Gold
atom
grass....bird .....snake.....hawk
x5
which is the primary consumer
bird
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
Which of these is a molecule?
NaCl (salt)
H2O (water)
Aluminum
Oxygen
NaCl (salt) and H2O (water)
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
d . a substance changes from a liquid from a gas
Which of the following is the LARGEST atom?
Hydrogen
Oxygen
Lithium
Which direction does energy flow in a trophic food/energy pyramid?
From the Bottom to the Top
What does the Law of Conservation of Mass say?
Matter is never created or destroyed, but transformed into a different form.
What is the formula for finding density?
mass divided by volume
What is the process by which plants make energy from the sun?
photosynthesis
What are the PRODUCTS of photosynthesis?
oxygen and glucose (sugar)
What are the reactants of photosynthesis?
Carbon dioxide, water, and sunlight
What is the process by which dry ice transforms from a solid to a gas without going through the liquid phase?
sublimation
What is the name of this common molecule?
C6H12O6
Glucose
What is the energy of motion called?
Where do all living things on the earth originally get their energy from?
The sun
What is it called when the earth heats up too much and the glaciers start to melt?
Global Warming or Global Climate Change
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
Which has more energy: a 50 kg rock or a 100 kg rock?
100 kg rock because more mass=more energy!
Frank has a beaker with a mixture of salt and water. He would like to recover the salt from the water. Which would be the best method to accomplish this?
a. evaporation b. reflection
c. freezing d. refraction
a. evaporation
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
The Earth is mostly covered by oceans. Oceans are found in the (x7)
a. hydrosphere
b lithosphere
c. atmosphere
d. troposphere
a. hydrosphere
Only 10% of the energy is used when going up each level of a trophic pyramid.
Where does 90% of the energy go when going up the trophic pyramid?
5X points
90% is lost as heat to the enviornment
What are the evidences of a chemical change?
Odor
Color
Precipitate
Gas
Temperature change (sometimes light and sound)
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
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
How many hydrogen atoms are in 4 molecules of NH4?
16
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
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
Where would you find icebergs?
a. hydrosphere
b. mesosphere
c. lithosphere
d. atmosphere
a. hydrosphere
What can you do to get a mylar balloon to float again once it has deflated?
Heat it up to increase the volume and decrease the density
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 is the SI (metric system) unit for volume?
liter or cubic centimeter
What is the process by which your body gets energy in every cell?
Cellular Respiration
Two rock samples are placed in water. Sample A floats, but sample b sinks to the bottom.
Which statement describes the 2 samples of rock (x
a. sample b has more mass
b. sample a has less volume
c. sample b has a greater density
d. sample a has a higher freezing point.
c . sample has a greater density
x4
Which is the best example of a chemical change?
a. fireworks exploding
b. cutting paper
c. crushing a can
d. melting snow
a. fireworks exploding
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.
How many atoms of hydrogen are in 3 molecules of H2O?
6
Why do scientists often say that photosynthesis is the opposite of respiration?
The products of respiration are the reactants of photosynthesis and vice versa.
What is the formula for carbon dioxide?
CO2
grass.....bird.....snake.....hawk
Which is the secondary consumer
snake
x8
grass.... mice....snake...hawk...
What would happen if the mice were removed from the food
a) The grass would increase and the hawk would decrease
b. The snakes would increase and the hawks would decrease
c. The grass would increase and the snakes would decrease
d. The Hawks would increase and the grass would decrease
c) grass would increase and the snakes decrease
Which of the following are physical properties?
density
melting point
flammability
explosive
reactivity
density and melting point
What is the charge of a neutron?
neutral=no charge
x2
Which material is a pure element or atom?
a. alcohol
b. copper
c. salt
d. water
b. copper