Science review 2
science review 3
science review 4
science review 5
science review 6
science review 7
science review 8
100
Give an example of a sign of a chemical change (reaction)
Random Answers that may include: Change in temperature, sound produces, light produced, fizzing or foaming, change the molecules permanently
100
Give an example of a physical change
Random answers that may include: bending, cutting, or melting something, but not changing the molcules in a permanent way.
100
When did the common ancestor to all living things appear in the fossil record?
a) 3.5 billion years ago
b) 350 million years ago
c) 1 billion years ago
d) 450 million years ago
3.5 billion years ago
100
grass....bird .....snake.....hawk
which is the primary consumer
bird
100
If kinetic energy is 1/2 mass x velocity squared...
What the is the kinetic energy of an object with a mass of 20kg traveling at 1 m/s? (Be specific!)
10J
100
True or false: Mass is ALWAYS conserved in a chemical reaction.
TRUE!
100
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 substance changes from a liquid to a gas
d . a substance changes from a liquid from a gas
200
Which of the following removes carbon dioxide from the atmosphere:
a) fossil fuels
b) greenhouse gases
c) plants
d) dead organisms
c) plants
200
Energy can never be created nor destroyed... only some is transformed into ____________
heat
200
What is the formula for speed?
distance/time
200
Which animal is more closely related to the wolf?
Leopard
200
What is one of the PRODUCTS of photosynthesis?
water, oxygen, and glucose (sugar)
200
What is the term for "process by which individuals best adapted to their environment have a better chance to survive and reproduce passing their traits to the next generation"?
Natural selection
200
Why can't you see the water vapor in the air?
a) It exists as a clear, odorless gas
b) There is very little of it
c) It's all been condensed
d) It's all far away in the upper atmosphere
a) It exists as a clear, odorless gas
300
Which would be an example of chemical potential energy:
a. a spring compressed
b. a ball rolling down a hill
c. a child sitting at the top of a slide
d. powder on the tip of a match
d. powder on the tip of a match
300
Where do all living things on the earth originally get their energy from?
The sun
300
Describe the limb bone structure found in humans, lions, birds, and reptiles
One bone, two bones, many bones, digits!
300
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
300
What is the probability (%) an offspring will have the phenotype for the dominant allele if two heterozygous parents cross?
75%
300
x2
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
300
This is the season in the Southern hemisphere in January
Summer
400
Newton's second law says:
? = mass x acceleration
Force
400
This is defined as the force of attraction between two masses
Gravity
400
Tommy placed a black, white, silver, and blue can under a heat lamp with a thermometer in each one. Which one of the cans will be the coolest? (x4)
a. black, because it absorbs the heat
b. blue, because it wasn't under direct light
c. white because it would reflect light
d. silver, because it is shiny
c. white, because it would reflect light
400
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
400
You push on a wall with 30 Newtons of force, it pushes back with?
30 newtons
400
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
400
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
500
What is the energy of motion called?
Kinetic energy
500
Which of these is NOT a greenhouse gas?
water vapor
carbon dioxide
methane
oxygen
oxygen
500
What is the unit for force?
Newtons (N)
500
This is the form of energy used to ride a bike
mechanical
500
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
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 b has a greater density
500
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
500
What is the total number of atoms in this molecule?
C6H22O6
34
600
What side of the moon is illuminated during waning?
left
600
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
600
What type of potential energy is food or fuel before it is used?
A. Mechanical
B. Chemical
C. Electrical
D. Thermal
chemical potential
600
Where is kinetic energy the greatest on a roller coaster?
a) The top of the highest hill
b) Just before the ride starts moving
c) At the bottom of the steepest hill
d) At the top of the loop
c) At the bottom of the steepest hill
600
a substance with two or more elements that are chemically bonded
a) mixture b) atom c) compound
compound
600
Each pair of students is given a 2 foot and 1.5 foot piece of aluminum foil to make a boat. The goal is to make a boat that can hold to the most pennies. Boats will be tested in a tank of fresh water and students will count the number pennies each boat holds before it sinks.
What is the dependent variable?
Number of pennies the boat can hold before sinking
600
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
700
What are the characteristics of a high-pressure system?
a) wind and rain
b) extremely hot temperatures
c) humidity and thunder
d) clear skies and sun
d) clear skies and sun
700
What cell structure stores DNA in eukaryotic cells?
Nucleus
700
What is the difference between velocity and speed?
velocity has a direction
700
If the angle of reflection is 45 degrees, what is the angle of incidence?
45 degrees
700
How many hydrogen atoms are in 4 molecules of NH4?
16
700
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
700
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.
800
If someone pushes on a box to the right with 100N while another pushes on box with 95N to the left, what is the net force on the box? (Be specific and complete)
5N to the right
800
This is the moon phase during a solar eclipse
full moon
800
grass.....bird.....snake.....hawk
Which is the secondary consumer
snake
800
Why are fossil fuels considered “nonrenewable”?
a) they are easy to make
b) they are cheap
c) they take millions of years to create
d) they are replaced as they are used
c) they take millions of years to create
800
The cell theory states all living things are made up of _________________
cells
800
What is the charge of a proton
positive
800
Which material is a pure element or atom?
a. alcohol
b. copper
c. salt
d. water
b. copper