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What is one difference between a mixture and a compound?
A compound can only be separated into components by chemical means.
Which of the following is a chemical property? Ability to react with oxygen, freezing point, hardness, color
Ability to react with oxygen
What must occur for a change to be a chemical reaction?
There must be a change in chemical properties.
Which of the following does not involve a physical change? Mixing, grinding, decomposing, melting
When paper turns yellow brown upon exposure to sun light, what type of change is taking place?
Which of the following does NOT indicate that a chemical change may have taken place?
Which of the following does not indicate that a chemical change may have taken place?
When a test instrument is calibrated, does its accuracy, precision or reliability improve?
All of the above
Three different people weigh a standard mass of 2.00 g on the same balance. Each person obtains a reading of 7.32g for a standard. These results imply that the balance used was
When multiplying and dividing measured quantities, the number of significant figures in the result should be equal to the number of significant figures in
the least precise measurement
. What is the volume of a salt crystal measuring 2.44 x 10-2 by 1.4 x 10-3 by 8.4 x 10-3.
2.9 x 10 m
Which of the following equalities is not correct?
10 kg = 1 g, 1000mm = 1m, 1cm3 = 1mL,
100 cg = 1 g
10 kg = 1 g
Bohrs model of the atom, where ate the electrons and protons located?
Electrons move around the protons, which are at center of atom
When an electron moves from a lower energy level to a higher energy level, the electron
absorbs a quantum of energy
. If the spin of one electron in a orbital is clockwise, what is the spin of the other electron in that orbital?
If three electrons are available to fill three empty 2p orbitals, how will they be distributed?
One electron in each orbital
As changes in energy levels of an electron increase, the frequencies of atomic line spectra they emit
the atomic emission spectra of a sodium atom on earth and a sodium atom on the sun would be
Which of the following quantum leaps would be associated with the greates energy of emitted light?
N =5 to n = 1
Bhors model could only explain the spectra of which types of atoms
single atoms with more than one electron
The quantum mechanical model of the atom
involves the probability of finding an electron in a certain position
in an s orbital, the probability of finding an electron a particular distance from the nucleus does not depend on
direction with respect to the nucleus
what is the basis for exceptions to the Aufbau?
Filled and half filled energy subshells are more stable than partially filled energy sublevels.
Which of the following electron configs is most likely to result in an element that is relatively inactive?
A filled highest occupied principal energy level
which subatomic particle plays the greatest part in determining the properties of an element
how does the atomic radius change from top to bottom in a group in the periodic table?
Tends to decrease
which of the following statements is not true about ions?
When a cation forms, more electrons are transferred to it
What is the energy required to remove an electron from an atom in the gaseous state called?
Which of the following factors contributes to the decrease in ionization energy within a group on the periodic table as the atomic number increases?
Increase in atomic size
which of the statements correctly compares the relative size of an ion to its neutral atom?
The radius of an anion is greater than the radius of its general atom.
use a period table - choose element you would expect to have the largest ionization energy He, C, Si, Ca
What is the name given to the electrons in the highest occupied principal energy level of an atom?
The octet rule states that, in chem. Compounds atoms tend to have
the electron config of a noble gas
Which of the following pairs of elements is most likely to form an ionic compound?
Magnesium and fluorine
Which of the following is not a characteristic of most ionic compounds?
They have low melting points
How do atoms achieve noble gas electron configurations in single covalent bonds?
Two atoms share two electrons
Which of the following elements can form diatomic molecules held together by triple covalent bonds
Which of the following is the name given to the pairs of valence electrons that do not participate in bonding in diatomic oxygen molecules?
Molecular orbital theory is based upon which of the following models of the atom?
How is a pair of molecular orbitals formed?
By the overlap of two atomic orbitals from different atoms
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