Science review 2
Give an example of a chemical change (reaction)
Random Answers that may include: Burning stuff, changing the molecules permanently
More than one atom bonded together is a.....
molecule
How many high tides and low tides are there in one day?
2 high and 2 low
A person jumps out of an airplane. 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 substance changes from a liquid to a gas
d . a substance changes from a liquid from a gas
Which of the following removes carbon dioxide from the atmosphere:
a) fossil fuels b) greenhouse gases
c) plants d) dead organisms
c) plants
Which type of electromagnetic wave has a wavelength longer than visible light?
infrared
gamma
Xray
ultraviolet
infrared
What is the process by which plants make energy from the sun?
photosynthesis
Most elements on the periodic table are classified as
metals
What is the name of this molecule?
CO2
Carbon Dioxide
How do you figure out how many neutrons an atom has if you know the mass?
Mass- protons=neutrons
Which would be an example of chemical potential energy: (x3)
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
How do you calculate force?
F=MA
How does the Earth's magnetic field protect life on the planet?
By blocking harmful radiation from the sun
Which has more energy: a 50 kg rock or a 100 kg rock?
100 kg rock because more mass=more energy!
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
Define cohesion and adhesion
Cohesion: water molecules stick together
Adhesion : water molecules stick to other things like paper towels and the insides of plant stems
What is Newton's first law?
Inertia is a property of matter: if matter is moving it will continue to move unless a force acts upon it and vice versa
Give a real-life example of condensation
answers will vary
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
You push into a well with 30 Newtons of force, it pushes back with?
30 newtons
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
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
What is the energy of motion called?
Kinetic energy
What is the unit for force?
Newtons (N)
What kind of material would sound travel through the fastest?
Solid, liquid or gas?
A solid!
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
Which material is a pure element or atom?
a. alcohol
b. copper
c. salt
d. water
copper
What is the total number of atoms in this molecule?
C6H22O6
34
What are the three fossil fuels?
coal , oil, and natural gas
What type of potential energy is food or fuel?
chemical potential
In any chemical reaction, the mass of the reactants always __________ the mass of the products.
equals
a substance with two or more elements that are bonded
a) mixture b) atom c) compound
compound
Through which phase of matter does sound travel fastest?
solid
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
Thermal energy gets moved from one place to another through a fluid. This kind of heat transfer is known as...
convection
What is difference between velocity and speed?
velocity has a direction
Does a Ferris Wheel have constant velocity? Explain.
No, it is constantly changing direction
How many hydrogen atoms are in 4 molecules of NH4?
16
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
on a distance time graph how do you know if an object is moving fast or slow?
the slope of the line
April 9
define ion
a charged atom
There is a box of books with an applied force of 125 N to the right and 380 N to the left. Will the box move and if so, how? What is the net force?
It will move to the left Net force = 255
How many more valence electrons would Carbon need to have a full outer shell?
2
Name the two phases of the moon that bring neap tides.
first and last quarter
What is a spring tide?
When the high tide and low tide have the biggest difference (full moon and new moon)