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Science Exam

Terms in this set (29)

Classify the following reaction: Cu(OH)2—
D. Decomostion
When a chemical change occurs:
A. Atoms rearrange
B. The law of conservation of mass is always obeyed
C. The chemical properties of new substances are different from the ones you started with.
D. All of the above
D. All of the above
The general name for chemical reactions combining oxygen with other reactants to realest large amounts of energy in the form of heat and light is:
Combustion
Of the following equations, the one which is NOT balanced is:
A. 2HCL+Ca(OH)2 —> CaCl2+2H2O
B. MgO+H2P —> Mg(OH)2
C.CA+O2->CAO
B. MgO+H2P —> Mg(OH)2
What would be the most likely products of the following reaction?
H2+O2->
H2O
PbI2
Solid
What is the whole number placed in front of a molecular formula in a chemical equation called?
Coefficient
A series of addition reactions taking place to produce large molecules are called
Polymerization
Evidence for a chemical change includes all of the following EXCEPT:
A. Phase change
B. Color change
C. Temperature change
D.production of bubbles
A. Phase Change
What is a whole number in a chemical formula indicating the number of atoms i a molecule called?
Subscript
Describe an orbital, in your description be sure to include the numbers of sub levels present in each type.
Orbitals are spaces electrons occupy, there are 4 levels s-2, p-6, d-10, and f-14.
When gas is heated, it may give off light. Explain how a scientist may identify the element or elements from which the gas is made.
There is a photon of light given off when excited electrons fall back down to the ground state and this gives off the light of the gas.
List four forces found within atoms and rank them in order of increasing strengths
Gravitational, weak, electromagnetic, strong
The further out from the nucleus, the ________________ and ________________ the energy levels become
Closer, bigger
True of false: The second most abundant gas in the atmosphere is carbon dioxide
FALSE it is oxygen
True or False: Mercury is a planet with little or no atmosphere
TRUE
True or False: The process responsible for changing earths atmosphere by reducing the amount of carbon dioxide in air is respiration
FALSE it is photosynthesis
True or False: Compared To Earth, the atmospheres of Venus and Mars contain a larger percentage of nitrogen
FALSE it is carbon dioxide
True or False An instrument used to measure atmospheric pressure is called a thermometer
FALSE it is a barometer
True or false: As temperature of gas held at constant pressure increases, the volume of the gas remains the same
FALSE it increases
True or false: If the volume and mass of a gas remains constant, as the temperature of gas increases, the pressure of the gas increases.
TRUE
The layer of gases surrounding a planet or other body in space is referred to as an _____________
Atmosphere
The common metrics unit used to measure pressure in the _________
Pascal
The most abundant gas in Earth's atmosphere is ___________
Nitrogen
A measurement of the force of air molecules in the atmosphere at a given altitude is called ___________
Atmospheric pressure
The relationship between the pressure and volume of a mass of gas at constant temperature is known as _______________ law
Boyle's
The temperature scale that must be used when doing calculations involving the gas laws is the ____________ scale
Kelvin
Instead of remaining in the atmosphere as carbon dioxide, carbon is stored on Earth in several ways. Name three.
Photosynthesis, organisms, and rocks.
List three units atmospheric pressure in order from smallest to largest.
Pascal, millibar, millimeters, inches, pounds per square in, atmosphere (atm)
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