Energy Flow in Ecosystems
What is an herbivore?
An organism that eats only plants
What is ATP?
ENERGY!!
What are the 3 parts of an atom (subatomic particles)?
Protons, electrons, and neutrons
True or False. A physical change is when two or more substances combine to form a new substance.
FALSE
Most metals are __________ at room temperature.
SOLID
True or False. Producers are the source of all food in an ecosystem.
TRUE
How many elements are in the compound Na2O?
2 elements
What is the center part of an atom called?
The NUCLEUS
Is combustion (burning) an example of a physical or chemical change?
CHEMICAL CHANGE
What are 3 characteristics that define METALS?
Possible answers:
Good conductors of electricity
Malleable
Ductile
Shiny/Lustrous
Found on the left-middle in the periodic table
What is an autotroph?
An organism that makes it's own food; does not need to eat other organisms to survive.
How many atoms are in the molecule CH4?
5 atoms
True or False. Electrons contribute to an atom's mass.
FALSE
Only protons and neutrons contribute to mass.
(Proton # + Neutron # = Atomic Mass)
A change in form or appearance of a substance that does not result in a new substance
PHYSICAL CHANGE
An element that would have properties of both zinc and carbon would be a _________________ .
Metalloid
What does this equation represent?
6CO2 + 6H2O ---> C6H12O6 + 6O2
Photosynthesis!
Is sodium chloride (NaCl) and element, compound, or mixture?
COMPOUND
How many valence electrons does an atom of Oxygen have?
Hint: Oxygen is #8 on the Periodic Table
6 valence electrons
Is food digesting an example of a physical or chemical change?
Chemical change
When a material allows electricity or heat to flow easily through it, it is a good _____________.
Conductor
Organisms lose _______% of the energy from their food.
90%
What 4 elements mostly make up Earth, living matter, oceans, and atmosphere?
Oxygen, Carbon, Nitrogen, and Silicon
(Hydrogen also acceptable)
If a sodium element has 11 protons and it's mass is 23 amu, how many neutrons does the atom have?
12 neutrons
23 - 11 = 12
What type of change occurs when you mix sugar and water?
Physical change.
The sugar and water can be separated by evaporation.
List the 3 types of elements in order of least to greatest conductivity
Nonmetals-Metalloids-Metals