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Chemistry Exam.
Katey Hale
Question | Answer |
---|---|
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 |