Maya, a student, performs a titration. she completes the following steps as part of her titration procedure. 1. she cleans and rinses a burette with base solution. 2. she fills the burette with standardized base solution. 3. she adds a base from a burette to an acid. 4. she observes a color change in the erlenmeyer flask. 5. she continues to add more base. based on the above procedure, will she obtain accurate results? yes, because the more base there is, the better the results will be. no, because she initially contaminated the burette with base. yes, because she used a standardized base solution in the burette. no, because she did not stop adding base once the color changed.

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.

How many grams of mgbr2 are needed to produce 75g or metal?