SciHawks

AP Chem- we began the Gas Stoichiometry/Gas Laws Unit by learning another gas-forming reaction: acid plus carbonate salt yields carbon dioxide, water, and salt.
We reviewed writing a "formula equation" from which we use our knowledge of strong and weak electrolytes and solubility rules to write the "ionic equation" and then the "net ionic equation".
We used the balanced equation in order to determine the number of MOLES of gaseous CO2 formed. Then we used the key pieces of information for converting moles of ANY ideally behaving gas to its volume; that is we plugged in the number of moles, temperature, and pressure to determine the volume (in liters) of the gas formed. So, in questions involving gaseous reactants or products, data on only 3 of the four variables (P, T, V, and n) need to be provided in order to determine the fourth variable because PV = nRT and "R" is the universal ideal gas constant.
We discussed that the ideal gas law is an equation that is obeyed more accurately when a gas is under conditions that cause it to have negligible intermolecular attractions and negligible individual gas molecule volume compared to the space between the gases i.e. high temperature and low pressure. We rearranged the gas law in order to solve for the molar mass of an unknown gas given its density at a given temperature: GFM (in grams per mole) = (d R T) / P.

Bio 6- we reviewed for Monday's exam, going over questions about DNA and looking at the big picture regarding chromosomes/chromatids, genes/alleles, and nucleotides/base pairs.
Remember, almost every test this year has a "scientific method" question and/or a graphing question so check your past notes and tests for what is required in your answers:
e.g. proper scientific method involves:
1. using large sample sizes to minimize random error
2. large number of trials to ensure/check for consistency of results
3. one and ONLY one "independent" variable that is DIFFERENT in amount between the control and experimental group or groups.
4. members of each group are selected RANDOMLY.
5. in drug or nutrient experiments, an identical looking "placebo" must be given to the control group; a placebo that has NO effect on dependent variable (what you are actually observing/measuring) must be used.

For graphs, each increment/box MUST be the same amount except for possibly the first box, which would then get a "squiggly" line.
The INDE(x)PENDENT variable goes on the x-axis and the dependent variable goes on the y-axis. DON'T forget to write the units on the LABEL/VARIABLE for each axis.
Your graph TITLE always comes from your HYPOTHESIS or from what you were measuring!
The title is "The effect OF the "INDEPENDENT VARIABLE"(insert the specific variable name in place of "independent variable") on the "DEPENDENT VARIABLE" (insert the specific variable name in place of "dependent variable") or you may write "The relationship between the "independent variable" and the "dependent variable".

Bio 7/8- we reviewed for Monday's exam, going over questions about DNA and looking at the big picture regarding chromosomes/chromatids, genes/alleles, and nucleotides/base pairs.
Remember, almost every test this year has a "scientific method" question and/or a graphing question so check your past notes and tests for what is required in your answers:
e.g. proper scientific method involves:
1. using large sample sizes to minimize random error
2. large number of trials to ensure/check for consistency of results
3. one and ONLY one "independent" variable that is DIFFERENT in amount between the control and experimental group or groups.
4. members of each group are selected RANDOMLY.
5. in drug or nutrient experiments, an identical looking "placebo" must be given to the control group; a placebo that has NO effect on dependent variable (what you are actually observing/measuring) must be used.

For graphs, each increment/box MUST be the same amount except for possibly the first box, which would then get a "squiggly" line.
The INDE(x)PENDENT variable goes on the x-axis and the dependent variable goes on the y-axis. DON'T forget to write the units on the LABEL/VARIABLE for each axis.
Your graph TITLE always comes from your HYPOTHESIS or from what you were measuring!
The title is "The effect OF the "INDEPENDENT VARIABLE"(insert the specific variable name in place of "independent variable") on the "DEPENDENT VARIABLE" (insert the specific variable name in place of "dependent variable") or you may write "The relationship between the "independent variable" and the "dependent variable".
We then did a microscopy lab in which we looked at plant and animal tissue in a region of rapidly dividing cells. The cells were stained and "frozen" so that you could see a snapshot of various cells in various phases of the cell cycle.