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Erin Chem Exam

Chemistry Exam Study Guide

QuestionAnswer
A physical property may be investigated by.. melting ice.
A physical change occurs when a glue gun melts a glue stick
The elemnts that border the zigzag line in the peridic table are metalloids.
The study of substances containing carbon is organic chemistry
Basic research is carried out for the sake of increasing knowledge
two features that distinguish matter are mass and volume.
Physical means can be used to separate mixtures.
A verticle column of blocks in the periodic table are group
Which element has properties most similar to those of sodium? Calcium
An example of an extensive property is mass.
Qualitative observations are recorded using non-numerical observations
The SI units for mass and length are meter and gram.
the unit m(3) meausres volume
The symbol that represents the measured unit for volume is mL.
The SI base unit for time is second
To calculate the density of an object, divide its mass by it volume
How many minutes are in one week? 10080 min
Poor precision in scientific meausurement may arise from both human error and the limitations of the measuring instruments.
The graph of a direct proportion is a straight line
the graph of an inverse proportion is a hyperbola.
Gamma rays are electromagnetic waves
As the mass number of the isotopes of an element increases the number of protons increases
A nuclide is identified by the number of protons
Experiments with cathode rays led to the discoveryt of the electron
all atoms of the same element have the same atomic number
radioactive tracers are used to follow the movement of substances in a system
isotopes of an element contain different number of neutrons
Rutherford's experiments led to the discovery of the nucleus.
What unit measures radiation? roentgen
What unit measures radiation damage to human tissue? rem
The distance between two succesive peaks on a wave is its wavelength
Which group are the noble gases? 18
the # of orbitals for the d sublevel is 5
Max Plank proposed that a hot object radiated energy in small, specific amounts called quanta
A quantum of electromagnetic energy is called a photon
know the symbol for wavelength λ
The main energy level that can hold only two electrons is the first
How many groups are found on the periodic table? 18
how many periods are found on the periodic table? 7
If electrons in an atom have the lowest possible energies, the atom is in the ground state
atoms are ______ when they are combined more stable
If two covalently bonded atoms are identical the bond is nonpolar covalent
A covalent bond occurs when _______ are shared. electrons
Most chemical bonds are partly ionic and partly covalent
A nuetral group of atoms held together by covalent bonds is a molecule
An octet is equal to 8
To draw a Lewis structure, one must know the number of valence electrons in each atom
How many double bonds are in the lewis structure for HF none
compared with ionic compounds, molecular compounds have lower melting points
Malleability and ductilitty are characteristics of substances with metallic bonds
To which group do lithium and potassium belong? alkali metals
Mendeleev pedicted that the spaces in his periodic table represented undiscovered elements
to which group do flourine and chlorine belong? halogens
the elements that border the zigzag line in the periodic table are metalloids
the most reactive group of the nonmetals are the halogens
a positive ion is known as a cation
a negative ion is known as an anion
Valence electrons are those in the highest energy level
THe # of valence electrons in group 2 elements is 2
The elements in group 1 are also known as the alkali metals.
Created by: erinlynn
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