Sci 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
What is an endothermic reaction?
a chemical reaction that absorbs heat energy from its surroundings causing temp to drop
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
Which of these is a molecule?
NaCl (salt)
Boron
Aluminum
Oxygen
NaCl (salt)
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
How many molecules are in 3NH4
a. 1
b. 7
c. 3
d. 12
c. 3
How many molecules are in FeO2B2?
1
What does the Law of Conservation of Mass say?
Matter is never created or destroyed, but transformed into a different form.
In chemistry, acids and ______ are two classes of substances
bases
What is the process by which plants make energy from the sun?
photosynthesis
What are the PRODUCTS of photosynthesis?
oxygen and glucose (sugar)
What is the name of this molecule?
CO2
Carbon Dioxide
Rusty nails are an example of a:
1. physical change
2. chemical change
3. structural change
4. no chance
2. chemical change
What is the name of this common molecule?
CO2
Carbon Dioxide
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
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
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
How many atoms are in 2C2Fe2?
8
a chemical reaction that releases heat energy to its surroundings
a. endothermic
b. exothermic
c. thermal
d. heat transfer
b. exothermic
NaCl is what common household item?
Table salt
What are the 3 evidences of a chemical change?
Odor
Color
Precipitate
Gas
Temperature change (sometimes light and sound)
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
Frozen orange juice is placed 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
What is the unit for energy?
JOULE
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
How many elements are in the formula
2C2Al2B
3
What is the energy of motion called?
Which of these is NOT a greenhouse gas?
water vapor
carbon dioxide
methane
oxygen
oxygen
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?
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 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 total number of atoms in this molecule?
C6H22O6
34
How many atoms of hydrogen are in 3 molecules of H2O?
6
What is the element "Au"?
Gold
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 type of potential energy is food or fuel?
chemical potential
grass.... mice....snake...hawk...
What would happen if the mice were removed from the food chain?
a) The grass would increase and the hawks 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
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
Which of the following is the LARGEST atom?
Hydrogen
Oxygen
Lithium
Oxygen
What causes balloons to float?
Helium
What is the formula for carbon dioxide?
CO2
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
grass......? .......fox
Which organism is missing from this food chain?
a. snake
b. mouse
c. hawk
d. flower
b. mouse
How many atoms are in 4 molecules of NH4?
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 is an owl pellet made? What is it?
A regurgitated ball of undigested fur, bones, and other pieces of animals that an owl eats.
What is respiration?
process by which organisms exchange gases, particularly oxygen and carbon dioxide, with their environment
What are the reactants of photosynthesis?
Carbon dioxide, water, and sunlight
Why do onions make us cry?
This gas irritates the eyes and stimulates tear production as a defense mechanism to flush out the irritant
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
Look at a periodic table to find this answer...
How many protons are in an atom of carbon?
6
What is the charge of a neutron?
neutral=no charge
Which material is a pure element or atom?
a. alcohol
b. copper
c. salt
d. water
b. copper