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Brooke Chemstry Exam

Brooke exam study guide(:

QuestionAnswer
The branch of chemistry concerned with the properties, changes, andrelationships between energy and matter is physical chemistry
Chemical properties... include changes of state of a substance
Two features that distinguish matter are... mass and volume
The melting of a candle wax is classified as a physical change because it... produces no new substances
Based on there location in the periodic table oxygen and selenium have... similar properties
The mosr useful source of chemical information about the elements is a... periodic table
Which is NOT a property of metals? unreactivity
Elements in a group in the periodic table can be expected to have similar properties
A physical change occurs when a... glue gun melts a glue stick
Basic Research is... carried out for the sake of increasing knowlegde
A testable statement used for making predictions and carrying out further experiments is a hypothesis
The symbol for the metric unit used to measure mass is g
To determine density, the quantities that must be measured are volume and mass
Poor precision in scientific measurement may arise from both human error and the limitations of the measuring instrument
The number of significant figures in the measurment 0.000 305 kg is 3
The number that has five significants figures is... 10.292
The graph of a direct proportion is a... straight line
Quantitatives observations are recorded using... non-numerical information
How many minutes are in 1 week? 10 080 min.
The SI base unit for time is the... second
Who was the schoolmaster who studied chemistry and proposed an atomic theory? John Dalton
Who discovered the nucleus by bombarding gold foil with positively charged particles? Rutherford
The atomic number of oxygen,8, indicates that there are 8... protons in the nucleus of an oxygen atom
What is the atomic number for aluminum? 13
What is the 218 in polonium-218 represent? the mass number
What is the half-life of an isotope if 125 g of a 500 g sample of the isotope remain after 3.0 years? 1.5 years
What Scientic discovered electrons? J.J Thompson
In a glass tube, electrical current passes from the negative electrode, called the_________ to the other electrode. cathode
What unit measures radiation? rem
Who called the "atom" an atom? J.J Thompson
A quantum of electromagnetic energy is called a... photon
The wave model of light did not explain.. the photoelectric effect
The part of the atom where the electrons CANNOT be found is the.. nucleus
The total number of orbitals that can exist at the second main energy level is... 4
The main energy levels of an atom are indicated by the... principle quantum numbers
Which group are the noble gases? 18
The main energy level that can hold only two electrons is the... first
The SI, the frequency of electromagnetic radiation is measured in... hertz
For an electron in an atom to change from the ground state to an excited state... energy must be absorbed
For electromagnetic radiation, c equals... frequency times wavelength
The atomic sublevel with the next highest energy after 4p is 5s
Mendeleev attempted to organize the chemical elements based on their... properties
To which group do lithium and potassium belong? alkali metals
Argon, Krypton, and xenon are noble gases
A horizontal row of blocks in the periodic table is called a... period
The person whose work led to a periodic table based on increasing atomic number was Moseley
The most characteristic property of the noble gases is that they are largely unreactive
The energy required to remove an electron from an atom___________ as you move from left to right from potassium through iron. generally increases
Valence electrons are those.... in the highest energy level
A negative ion is known as a anion
The elements in Group 1 are also known as the alkali metals
Atoms are _________ when they combined more stable
A covalent bond results when _______ are shared electrons
An octet is equal to 8
If two covalently bonded atoms are identical, the bond is nonpolar covalent
The electrons involved in the formation of a chemical bond are called valence electrons
In drawing a Lewis structure, each nonmetal atom except hydrogen should be surrounded by 8 electrons
Most chemical Bonds are partly ionic and partly covalent
A neutral group of atoms held together by covalent bonds molecules
The electron-sea model of bonding represents metallic bonding
Created by: brooke12