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casey chem exam


What are the radioactive elements with numbers from 90 to 103 in the periodic table called? the actinides
To which group do lithium and potassium belong? alkali metals
Arogon, krypton, and xenon are? noble gasses
A horizontal row of blocks in the periodic table is? period
A vertical row of blocks in the periodic table is? group
The elements that border the zigzag line in the periodic table is? metalloids
The most reactive group of nonmeatals is? halogens
A positive atom is known as? cation
A negative ion is known as? anion
The elements of group one are all known as? alkali metals
study of the composition of maerials and the changes that materials undergo is? chemistry
Technology is? application of chemical principles to prodict events
Basic research is? carried out for the sake of increasing knowledge
Applied research is? caried out to solve a problem
A physical property may be investigated by melting ice
Chemical properties include changes that alter the identity ofasubstance
Two features that distinguish matter are mass and volume
An example of an extensive physical property is mass
The particles in a solid are? packed closely together
Physical means can be used to separate mixtures
the symbol for the metricunit used to measure mass is g.
the metric unit that is closest to a dime is? millimeter
standards are chosen because they are reproducible in another laboratory
a testable statemant used for making predictions are carring out further experiments is a hypothesis
the unit m^3 measures volume
the symbol that representsthe measuredunit for volume is? ml
the SI unit for time is? second
how many minutes are in a week? 10,080 min.
the number of significant figures in 210 is 2
the number of significant figures in 10000000 1
nickle-60 has 32 neutrons
phosphorus-33 contains 18 neutrons
what is the atomic number for aluminum? 13
atomic number indicates the number of proton in the nucleus
the descovery of the electron resulted from the cathode rays
what is the atomic number for aluminum 13
what does 218 in polonium-218 represent mass number
sulphur-34 contains 18 neutrons
gamma rays are electromagnetic waves
who called the atom "atom" democritus
a quantum of electromagnetic energy is called photon
the number of orbitals in d is 5
the number of orbitals in s is 2
the number of orbitals in p 6
the SI offrequency of electromagnetic radiation is hertz
part of the atom where electron can't be found is nucleus
how many periods are their on the periodic table 7
the atomic sublevel right below 4p is 5s
asingle orbital in the 3rd lvl can hold 2 electrons
atoms are ---- when they are combined more stable
a covalent bond results when --- are shared electron
if two covently bonded atoms are identical, the bond is nonpolar covaleny
the electrons involved is the formation of a chemical bond are called valence electrons
most chemical bonds are partly ionic and partly covalent
a neutral group pf atoms held togethyer by covalent bond is a molecule
an octct is equal to 8
how many double bonds are in the lewis structure for hydrogen fluoride, HF none
the electron-sea model of bonding represents metallic bonding
example of a molecular formula O2
Created by: CAL