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megs.c._study_stack

semester exam

QuestionAnswer
Basic research is carried out for the sake of increasing knowledge.
Applied research is carried out to solve a problem
Chemical properties include changes that alter the identity of a substance.
Two features that distinguish matter are mass and volume
An example of an extensive physical property is Mass
Color is an example of what property? Intensive
The particles in a solid are packed closely together
The state of matter in which a material has a definater shape and definite volume. Solid state
The state of matter in which a material has a definite volume but no definite shape Liquid State
A physical property may be investigated by Melting ice
The SI standard units for length and mass are meter and kilogram
The metric unit for lentgh that is closest to the thickness of a dime is the millimeter
The symbol for the metric unit used to measure mass is m
The unit m3 measures volume
The symbol that represents the measured unit for vilume is mL
The number of significant figures in the measurement 0.000305 is 3
The # of significant digits in the measured value 0.00320 3
0.202 has how many significant digits 3
The number of significant digits in the measurement 170.040 is 6
30.00 has how many significant figures? 4
The number of significant digits in 210 2
The study of chemistry is The study of
Gamma rays are electromagnetic waves
A nuclear particle that has about the same mass as a proton, but with no electrical charge is called nuetron
Sulfur-34 contains 18 neutrons
the smallest unit of an element is atom
Nickel-60 has 32 neutrons
An atom of potassium has 9 protons and 20 nuetrons, what is its mss number? 39
The fores that hold the particles in the nucleus togther are called nuclear forces
Experiments with cathode rays led to the discovery of the electron
Which particles have the greatest penatrating ability Gamma Rays
For electromagnetic radiation c equals frequency times wavelength
In SI the frequency of electromagnetic radiation is measured in hertz
One of the wave properties of electromagnetic radation such as light is frequency
As it travels through space electromagnetic ehibits wavelike behavior
the distance between two successful peaks on a wave is called wavelength
a quantum of electromagnetic energy s called a photon
The wave model of light did not explain the photoelectric effect
Max Planck proposed that a hot object radiated energy in small specific amounts called quanta
The Emission of electrons from metals that have absorbed photons is called the photoelectric effect
Because excited hyf=drogen atoms always produce the same-line emission spectrum scientists concluded that hydrogen released photons of only certain energies
Atoms are _____ when they combined more stable
When atoms share electrons the electrical attraction of an atom for the electrons is called electronegativity
If the atoms that share electrons have unequal attraction for the electrons the bond is called, polar
A covalent bond results when ____ is shared electrons
A mutual eletrical attraction between the nulcei and valence electrons of different atoms that binda the atoms together is called a chemical bond
In many compounds atoms of main group elements form bonds so that teh number of electrons in the outer most energy level is 8
A chemical bond resulting from the electrostatic attraction between + and - ions is called ionic bond
The electrons
Created by: Magasaurus
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