It has been determined that fluoride can prevent the decay of tooth enamel. Historically, tin(II) fluoride was added to toothpaste to help combat tooth decay. Titration analysis was used to determine the concentration of tin(II) fluoride in a NMmple of toothpaste. A 10.0 mL sample of tin(II) fluoride solution was acidified and titrated with 0.0100 mol/L potassium dichromate solution as represented by the following equation.
3Sn2+(aq)+Cr2O2−7(aq)+14H+(aq)→3Sn4+(aq)+2Cr3+(aq)+7H2O(l)
Trial I II III IV Final Volume (mL) 9.39 16.93 23.61 30.32 Initial Volume (mL) 2.85 9.39 16.93 23.61 Volume Used (mL)
a.The moles of Cr2O72-(aq) that reacted, expressed in scientific notation, is a.bc x 10-dmol. The values of a, b, c and d are
b.The concentration of Sn2+(aq), expressed in scientific notation, is a.bc x 10-d mol/L. The values of a, b, c and d are
Posted 5 years ago by noure2 in Chemistry 30 | 1 answers
#chemistry 30
Feather colour in parakeets is controlled by two genes. Blue colour (B) is dominant over absence of colour (b). Yellow colour (Y) is dominant over absence of colour (y). When a B allele and a Y allele are present, a green parakeet is produced. What is the percent probability of obtaining a yellow or blue parakeet when a heterozygous green parakeet is crossed with a white parakeet? What are the genotypes of the parents?
Posted 5 years ago by msather in Biology 30 | 1 answers
#polygenic traits #genetics and probability
Show that P(x)/x-a = Q(x)+ R/x-a can be rearranged to P(x)= Q(x)(x-a)+R
Posted 5 years ago by sandhu123 in Math 30-1 | 2 answers
#polynomials
Helium for balloons is often stored in steel containers. Under what pressure is helium in a 10.0 L cylinder at room temperature (25 degrees Celsius) if 350 g of He are held
Posted 5 years ago by Sumaira in Chemistry 20 | 1 answers
#stochiometry
Explain how Soviet communism could be viewed as a rejection of liberal values
Posted 5 years ago by Paule in Social Studies 30-2 | 1 answers
#hitler #ideologies
To what extent does providing universal healthcare for all citizens represent socialist and or modern liberal values
Posted 5 years ago by Paule in Social Studies 30-2 | 1 answers
#ideologies
In an organism with a diploid number of 16, how many chromatids are present in each of the following phases:
Answer Answer Answer Mitotic metaphase Meiotic metaphase I Meiotic metaphase II
Use the following information to answer the next two questions.Nondisjunction is an error in meiosis that results in non-separation of chromosomes during anaphase. Nondisjunction can occur during anaphase I or anaphase II of meiosis.
Posted 5 years ago by vowoeye in Biology 30 | 1 answers
#cell divison and genetics
What is the theme in the "To be or not to be" speech in "Hamlet"?
Posted 5 years ago by kaiarose225 in English 30-1 | 1 answers
#hamlet #theme
a school playground covers an area of 14 000 m2
a.) express this radical as a mixed radical in simplest form, for your first step express the radicand as the product of prime factors
b.) could this playground be square? explain.
Posted 5 years ago by Carias in Math 20-2 | 2 answers
#radicals #quadratic functions
an object travelling in a straight line at a constant velocity with a kinetic energy of 2.0J. If the mass of the object was doubled and it's speed was tripled, determine the objects new kinetic energy
Posted 5 years ago by Spenser in Physics 20 | 3 answers
#kinematics