Back to AI Flashcard MakerChemistry /Chemistry Lab Concepts Part 1
What is meant by the simplest formula of a compound?
the lowest whole number ratio of the atoms in the formula
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Term
Definition
What is meant by the simplest formula of a compound?
the lowest whole number ratio of the atoms in the formula
How does a hydrate differ from an anhydrate?
hydrate- is combined with a specific number of water molecules. anhydrate- an ionic compound that remains when all water is removed
What happens when a hydrate is heated?
the water will evaporate and water molecules are removed
A hydrate of CoCl2 with a mass of 6.00g is heated strongly. After cooling, the mass of the anhydrate is 3.27 g. a. how many grams of H2O were lost from the hydrate?
6.00g of hydrate - 3.27g of anhydrate= 2.73 g H2O
A hydrate of CoCl2 with a mass of 6.00g is heated strongly. After cooling, the mass of the anhydrate is 3.27 g. b. What is the % in the hydrate?
2.73 of H20 / 6.00 g hydrate X 100 = 45%
Write the equation for the dehydration of the CoCl2 hydrate
6H2O + CoCl2 -(HEAT)-> CoCl2 +6H2
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| Term | Definition |
|---|---|
What is meant by the simplest formula of a compound? | the lowest whole number ratio of the atoms in the formula |
How does a hydrate differ from an anhydrate? | hydrate- is combined with a specific number of water molecules. anhydrate- an ionic compound that remains when all water is removed |
What happens when a hydrate is heated? | the water will evaporate and water molecules are removed |
A hydrate of CoCl2 with a mass of 6.00g is heated strongly. After cooling, the mass of the anhydrate is 3.27 g. a. how many grams of H2O were lost from the hydrate? | 6.00g of hydrate - 3.27g of anhydrate= 2.73 g H2O |
A hydrate of CoCl2 with a mass of 6.00g is heated strongly. After cooling, the mass of the anhydrate is 3.27 g. b. What is the % in the hydrate? | 2.73 of H20 / 6.00 g hydrate X 100 = 45% |
Write the equation for the dehydration of the CoCl2 hydrate | 6H2O + CoCl2 -(HEAT)-> CoCl2 +6H2 |
Using the rules for writing the formulas of ionic compounds, write the ions and the correct formula for magnesium | MgO |
Write a balanced equation for the reaction of the magnesium and the oxygen (O2), including their physical states | 2Mg + O2 -(HEAT)-> 2MgO |
Using the formula you obtained in B11, write a balanced equation for the dehydration of the MgSO4 Hydrate used in the experiment | MgSO4 + 7H20 -(HEAT)- > MgSO4 + 7H2O |
In making pickles, a cucumber is placed in a concentrated salt solution. Explain what happens to the cucumber when it is left in the salt solution for some time | the cucumber is placed in a hypertonic solution and the water is drawn out of the cucumber through osmosis |
Why is it important that cell membranes are semipermeable? | Because nutrients can be brought into a cell |
What are the differences between solutions, colloids and suspensions? | Solutions- filtered out by semipermeable membrane colloids- smaller, can not be filtered out by filter paper suspensions- larger can not be filtered out by filter paper |
a. 10% (m/v)starch b. 4% (m/v)starch | a |
a. 2% (m/v) albumin b. 5%(m/v) albumin | b |
a. 8%(m/v) sucrose b. 0.8%(m/v) sucrose | a |
10%(m/v) NaCl | crenation |
2%(m/v) glucose | hemolysis |
H2O | hemolysis |
5%(m/v) glucose | no change |
A solution that turns orange-red when mixed with Benedict's reagent and heated for 5 min | glucose |
A solution that turns blue-black when mixed with a few drops of iodine reagent | starch |
A solution that forms a white precipitate when mixed with a few drops of AgNO3 | chloride |
Which substances were found in the water outside the dialysis bag? | glucose and Cl- |
How did those substances get into the water outside the dialysis bag? | by the semipermeable membrane |
H2O | hypertonic |
0.9 %(m/v) NaCl | isotonic |
10 %(m/v) glucose | hypertonic |
3 %(m/v) NaCl | hypertonic |
0.2 %(m/v) NaCl | hypotonic |
2 %(m/v) NaCl | crenation |