Sunday, December 21, 2014

#14 and #15 on the homework due 12/19

2 H3PO4 + 3 Ca(OH)2   à  Ca3(PO4)2 + 6 H2O
0.75 L x (6 mol/L) = 4.5 mol H3PO4
4.5 mol H3PO4 ∙ (6 mol H2O/2 mol H3PO4) ∙ (18.0128 g H2O/ 1 mol H2O) = 243 g water
4.5 mol H3PO4 ∙ (1 mol Ca3(PO4)2/2 mol H3PO4) ∙ (310 g Ca3(PO4)2/1 mol Ca3(PO4)2) = 698 g calcium phosphate

3 H2SO4 + 2 Al(OH)3 à  Al2(SO4)3 + 6 H2O
0.250 L ∙ (2.5 mol Al(OH)3 / 1 L) = 0.625 mol Al(OH)3
0.625 mol Al(OH)3 ∙ (3 mol H2SO4/2 mol Al(OH)3) = 0.9375 mol H2SO4
18.0 = 0.9375/x    

X = 0.0521 L = 52.1 mL H2SO4

Friday, December 5, 2014

Writing Assignment 12/5

You have learned about two extremes of dealing with asbestos exposure.  You have watched how WR Grace executives withheld information from its workers regarding their exposure, and you have heard Mr. Barnett talk about all of the government regulation regarding asbestos in schools.  He obviously feels like these regulations are excessive.  Do you agree?  Explain your reasoning.

Wednesday, November 26, 2014

Limiting Reactant wksht

Mik'haela:  better later than never, right?


Wednesday, November 19, 2014

Writing Topic

According to, the definition of symbiosis is:


 noun \ˌsim-bē-ˈō-səs, -ˌbī-\
biology : the relationship between two different kinds of living things that live together and depend on each other
: a relationship between two people or groups that work with and depend on each other

Using the article as a basis for your discussion, explain how theoretical scientists and experimenters/observers are involved in a symbiotic relationship.

Wednesday, November 12, 2014

3 Additional Questions for HW due 11/14

Predict if a precipitate forms in each of the following.  If it does, complete and balance the equation using all appropriate reaction symbols.

1.   silver chloride +  sodium phosphate -->

2.   lead (II) chloride + aluminum sulfate -->

3.   zinc acetate + aluminum nitrate -->

Tuesday, November 4, 2014

ACT practice/writing assignment

Go to the following ACT practice question.  Then either write an email to or share a GoogleDoc (shared with me) explaining the reasons for your choice in a complete paragraph.

ACT chemistry question

Monday, October 13, 2014

Writing assignment 10/14/14

Read the science selection from an ACT practice test question at Varsity Tutors.  Then use complete sentences (in an email to to explain what answer you choose and what facts presented in the reading passage were used in arriving at that answer.  Three to five sentences should suffice.