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Which of the following theories is associated with ‘constraints’.

— refers to the brain’s selective elimination of connections due to infrequent use and lack of          stimulation.

—–  are environmental “opportunities” for developing motor skills.

A 1.00 M solution of dye is diluted by taking 10.00 ml of it and adding enough water to make 100.0 ml solution.  Then, 10.00 ml of that solution is diluted to a volume of 250.0 ml.   What is the concentration of the diluted dye? 

A 15.27 g sample of a liquid consisting of only C, H, and O was completely combusted in pure oxygen, and 22.01 g of CO2 and 11.26 g of H2O were obtained.  What is the empirical formula of the compound ?     

A 40.00 mL solution containing an unknown concentration of H2SO4 is titrated with 22.62 mL of 0.2000 M NaOH solution.  Calculate the molarity of the H2SO4 solution.

A hypothetical element has an atomic weight of 123.45 g/mol.  It consists of 2 isotopes having masses of 124.05 g/mol and 122.67 g/mol.  What is the percent abundance of the lightest isotope?

During the nuclear decay of the 208Po isotope, two neutrons and two protons are lost, resulting in which isotope?  

Classify the following reaction by giving all of these reaction type(s) that apply.I. redox            II. combination    III. decomposition        IV. displacement               V. metathesis 2PbO(s)   +   O2(g)   →   2PbO2(s)     

The density of fresh milk (as it comes from the cow) is found to be 64.20 lb per cubic foot. Converted to SI units this translates into: