What Does it Matter?
6.02 x 1023
Describes horizontal rows of the table
Periods
This is the variable that is manipulated (changed) by the scientist.
Independent variable
This type of bond involves pairs of electrons being shared
Covalent
Provide an example of a heterogeneous mixture.
Chex mix, chicken noodle soup, etc.
Which group of the periodic table mostly contains elements with a full octet of valence electrons.
Noble gases (Group 18)
This is the variable that reacts to a change in the other variable.
Dependent variable
This molecular shape is produced when there are 4 atoms bonded to the central atom, with 0 lone pairs on the central atom.
Tetrahedral
This word describes atoms of the same element that have different masses
Isotopes
alkali metals; gain
The control group does not receive the ___ variable.
Independent
What is the chemical formula produces when magnesium combines with phosphorus.
Mg3P2
24 amu
Elements in group 17 are called ____, and then tend to ____ one electron.
Halogens; gain
A chemist is testing how adding various amounts of ethyl alcohol to a chemical will change that chemical's boiling point. What is the IV?
The amount of ethyl alcohol being added
Write out the OUTER electron configuration for an atom in Group 1, period 3.
3s1
Write the equation for calculating density.
D=m/V
Imagine an atom of Ca+2 with a mass of 41 amu. How many protons, electrons, and neutrons does it have?
Protons=20, Electrons=18, Neutrons=21
A pharmaceutical research is testing to see if a new drug reduces the symptoms of a thyroid disease in rats. What are three things they should keep constant?
Species of rat, type of drug, amount of drug, all rats should start at same health level with same thyroid disorder, same amount of food/water, same cage etc.
Describe the difference between accuracy and precision.
Accuracy=how close result is to true value; Precision=how replicable the data is