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Colligative properties (ΔTf , ΔTb) of sucrose with ethanol as a solvent (20%masse)?
Write down the expressions for K p and Kc for the following reaction. How are
they related?
CaCO3 (s)<---->CaO (s) + CO2 (g)
they related?
CaCO3 (s)<---->CaO (s) + CO2 (g)
Describe three uses of rhodium as a catalyst (include both a written description and the balanced chemical equation)
Use collision theory to explain the following
Liquid gasoline will burn, but gasoline vapor will explode. (Hint: this example contains two factors.)
People who work in papaya-processing plants must wear gloves and masks for personal protection.
Campfires are stated with matches that are used to light loosely packed kindling (small pieces of very dry wood). (Hint: This example contains three factors).
Liquid gasoline will burn, but gasoline vapor will explode. (Hint: this example contains two factors.)
People who work in papaya-processing plants must wear gloves and masks for personal protection.
Campfires are stated with matches that are used to light loosely packed kindling (small pieces of very dry wood). (Hint: This example contains three factors).
a) Write a procedure that would follow to demonstrate the effect of increasingly higher concentrations of hydrochloric acid on its rate of reaction with antacid tablets. Can only use materials listed:
- Hydrochloric acid (with a concentration of 1.0 mol/L)
- Distilled water
- Antacid tablets (calcium carbonate)
- A mortar and pestle
- Graduated cylinders (10 mL, 100 mL sizes)
- Test tubes and beakers
- Balance and measuring pan
- Hot plate (heat source)
- Thermometer
- Stopwatch or other timing device
- Ice-water bath
- Scoop
b) Design a table (giving headings only) for your observations.
c) Describe and explain three safety procedures you would have to follow when performing your procedure in a laboratory setting.
d) For the procedure that you designed in part (a), describe three different controls you used.
Follow 1 answer
- Hydrochloric acid (with a concentration of 1.0 mol/L)
- Distilled water
- Antacid tablets (calcium carbonate)
- A mortar and pestle
- Graduated cylinders (10 mL, 100 mL sizes)
- Test tubes and beakers
- Balance and measuring pan
- Hot plate (heat source)
- Thermometer
- Stopwatch or other timing device
- Ice-water bath
- Scoop
b) Design a table (giving headings only) for your observations.
c) Describe and explain three safety procedures you would have to follow when performing your procedure in a laboratory setting.
d) For the procedure that you designed in part (a), describe three different controls you used.
Follow 1 answer
Explain the processes which are used for the extraction of metals from carbonates and sulphide ores.
A student titrates a sample with HCl solution using methyl red as indicator and finds it contains 20% K2CO3. Later he realises his sample contained Na2CO3 instead of K2CO3. What is the % concentration of Na2CO3 in the sample?
How many grams of ethane gas (C2H6) are in a 12.7 liter sample at 1.6 atmospheres and 24°C? Show all work used to solve this problem.
what is the type of error (positive or negative) during the calculation of concentration if the following occurs:
during the volumetric analysis of Potassium hydrogen phthalate, a solution of NaOH contaminated with CO2 was used.
during the volumetric analysis of Potassium hydrogen phthalate, a solution of NaOH contaminated with CO2 was used.
discuss anaerobic respiration in man
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#339914 on Dec 2023
#339914 on Dec 2023