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Chemistry Exam.

Katey Hale

QuestionAnswer
Study of the composition and structure of materials undergoe best describes the science of... chemistry
The branch of chemistry that is concerned with the identification and composition of materials is... analytical
The branch of chemistry concerned with the properties, changes, and relationships between energy and matter is... physical chemistry
A physical property may be investigated by... melting ice
Two features that distinguish matter are... mass and volume
Which of the folowing is an intensive physical property? color
A physical change occurs when a... glue gun melts a glue stick
The particles in a solid are packed closely together
THe state of matter in which a material has definite shape and definite volume is the... solid state
Physical means can be used to seperate... mixtures
To calculate the density of an object... divide its mass by its volume
In divison and mutiplication, the answer must not have more significant figures that the... number in the calculation with fewest significant figures
A chang in the force of earths gravity on an object will affect its... weight
The SI base unit for measuring length of an automobile is the... meter
If some measurements agree closely but differ widely from the actual value, these measuresments are... precise, but not accurate
A testable staement used for making predictions and carrying out further experiments is a... hypothesis
Standards are chosen because they... are reproducible in another labratory
Quantative observations are recorded using... non-numerical information
The metric unit for length that is closest to the thickness of a dime is the... millimeter
THe symbol that reprents the measured unit for volume is... mL
Who was the school master who studied chemistry and proposed and atomic theory? John Dalton
Organic chemcistry is the study of what? carbon containing compounds
The smallest unit of an element that can exist alone or in combination with other such particles is an? atom
The discovery of the electron resulted from experiments using... cathode rays
All atoms of the same element have the same what? atomic number
An aluminum isotope consits of 13 protons, 13 electrons, and 14 nuetrons. Its mass number is... 27
Rutherford's experiments led to the discovery of the... nucleus
What scientist discovered electrons? J.J. Thompson
Which form of radiation has the greatest penetrating power? Gamma Rays
Reactions that affect the nucleus of an atom are called what? nuclear reactions
Which form of radiation has the greatest penetrating power? Gamma Rays
THe atomic sublevel with the next highest energy after 4p is... 5s
Reactions that affect the nucleus of an atom are called what? nuclear reactions
Max PLanck proposed that a hot object radiated energy in small, specific amounts called... hertz
The distance between two successive peaks on a wave is its what? wavelength CH4
THe atomic sublevel with the next highest energy after 4p is... 5s
Because excited hydrogen atoms always produce the same line-emisson spectrum, scientists concluded that hydrogen... release photons of only certain energies
Max PLanck proposed that a hot object radiated energy in small, specific amounts called... hertz
THe number of orbitals for the d sublevel is... 5
A quantum of electromagnetic energy is called what? photon
For electromagnetic radiation, c (the speed of light) equals... Frequency times wavelength
How many periods are on the periodic table? 7
A single orbital in the 3d level can hold how many electrons? 2
A three dimensional region around a nucleus where an electron may be found is called a... orbital
If electrons in an atom have the lowest possible energies, the atom is in the... ground state
What are the radioactive elements with atomic numbers from 90 to 103 in the periodic table? the actinides
Mendeleev noticed that properties of elements usually repeated at regular intervals when the elements were arranged in order of increasing what? atomic mass
THe person whose work led to a periodic table based on increasing atomic number was... Moseley
THe priciple that states that the pyhsical and chemical properties of the elements are periodic functions of thier atomic number is... the period law
A horizontal row of blocks in the periodic table is called a... period
A positive ion is known as a(n) cation
A negative IOn is known as a(n) anion
The energy required to remove an electron from an atom___________as you move left to right from potassium trhough iron generally increases
Valence electrons are those... in the highest energy levels
Within a group of elements(going down),as the atomic number increases the atomic radius... increases
Atoms are _______ when they are combined. more stable
A mutual electrical attraction between the nuclei and valence electrons of different atoms that binds the atoms together is called a what? chemical bond
Most chemical bonds are... partly ionic and partly covalent
A neutral group of atoms held to gether by a covalent bond is a... molecule
If the atoms that chare electrons have an unequal attraction for the electrons, the bond is called... polar
The electron sea model of bonding represents... metallic bonding
IF a material can be shaped or extended by physical pressure, such as hammering, which property does the material have? malleability
The elements of the _________ group satisfy the octet rule without forming compounds. noble gas
What principle states that atoms tend to form compounds so that each atom can have eight electrons in its outermost energy level? octet rule
Malleability and ductility are characteristics of substances with... metallic bonding
Created by: katey2011