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
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.
Is this an example of a molecule or an atom?
Gold
atom
Which of the following is the LARGEST atom?
Hydrogen
Oxygen
Lithium
Oxygen
What is the unit for energy?
JOULE
How long does it take for the moon to complete a full revolution around the earth?
29 days
Inversely Proportional
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
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
What is the name of this common molecule?
C6H12O6
Glucose
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
What is the SI (metric system) unit for volume?
liter or cubic centimeter
What is it called when the earth heats up too much and the glaciers start to melt?
Global Warming or Global Climate Change
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 of the following are physical properties?
density
melting point
flammability
explosive
reactivity
density and melting point
How many atoms of hydrogen are in 3 molecules of H2O?
6
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 formula for carbon dioxide?
CO2
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?
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
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
Look at a periodic table to find this answer...
How many protons are in an atom of carbon?
6
Which of these is a molecule?
NaCl (salt)
H2O (water)
Aluminum
Oxygen
NaCl (salt) and H2O (water)
What is the name of this molecule?
CO2
Carbon Dioxide
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
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 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
What is the charge of a neutron?
neutral=no charge
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
What is the total number of atoms in this molecule?
C6H22O6
34
Which material is a pure element or atom?
a. alcohol
b. copper
c. salt
d. water
b. copper
When does a spring tide occur?
When the sun, earth and moon are aligned with one another.
What is the cause of the day and night cycle?
When the sun is shining on one side of the earth it is experiencing day time, while the other side is experiencing night time.