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What is the density of the metal if a graduated cylinder contains 20.6ml of water, and after placing the metal, the volume is 23.7ml, and the mass of the metal is 34.17g?
What is the density of the metal if a graduated cylinder contains 20.6ml of water, and after placing the metal, the volume is 23.7ml, and the mass of the metal is 34.17g?
11 g/ml
Convert 45.90cm into meters.
Convert 45.90cm into meters.
0.4590 m
What was the purpose of the manganese dioxide (MnO2) in experiment 3?
What was the purpose of the manganese dioxide (MnO2) in experiment 3?
To act as a catalyst and speed up the decomposition of hydrogen peroxide.
Why were the bottles of oxygen stored with the mouth up in experiment 3?
Why were the bottles of oxygen stored with the mouth up in experiment 3?
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Why did the candle burn longer in a bottle of oxygen compared to a bottle of air?
Why did the candle burn longer in a bottle of oxygen compared to a bottle of air?
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What is AgNO3?
What is AgNO3?
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What is HI(aq) commonly known as?
What is HI(aq) commonly known as?
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What is the formula for Copper (II) Bromide?
What is the formula for Copper (II) Bromide?
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What is the formula for Aluminum oxide?
What is the formula for Aluminum oxide?
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What is the formula for lead (II) fluoride?
What is the formula for lead (II) fluoride?
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What is the formula for chromium (III) phosphide?
What is the formula for chromium (III) phosphide?
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What evidence indicated that the liquid obtained from copper (II) sulfate pentahydrate was water?
What evidence indicated that the liquid obtained from copper (II) sulfate pentahydrate was water?
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What evidence of a chemical reaction was observed when the anhydrous salt samples were treated with the liquid from the hydrate?
What evidence of a chemical reaction was observed when the anhydrous salt samples were treated with the liquid from the hydrate?
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Could the decrease in mass of the unknown upon heating be due to loss of other substances?
Could the decrease in mass of the unknown upon heating be due to loss of other substances?
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If a hydrated salt sample with initial mass of 4.8702g decreased to 3.0662g, what is the minimum mass after reheating?
If a hydrated salt sample with initial mass of 4.8702g decreased to 3.0662g, what is the minimum mass after reheating?
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What was the percent water in the original hydrated sample if the mass lost was 1.8053g?
What was the percent water in the original hydrated sample if the mass lost was 1.8053g?
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Why did coarse salt take longer to dissolve than fine salt?
Why did coarse salt take longer to dissolve than fine salt?
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How does temperature affect the rate of dissolving salt?
How does temperature affect the rate of dissolving salt?
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What is a solution called if it dissolved completely?
What is a solution called if it dissolved completely?
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What is a solution called if it does not dissolve completely?
What is a solution called if it does not dissolve completely?
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What is the percentage by mass of NaCl in a saturated solution at 50C?
What is the percentage by mass of NaCl in a saturated solution at 50C?
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What is the solubility of potassium bromide at 23C?
What is the solubility of potassium bromide at 23C?
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How much additional barium chloride can be dissolved by heating a saturated solution from 30C to 60C?
How much additional barium chloride can be dissolved by heating a saturated solution from 30C to 60C?
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How many grams of solute are dissolved in 100g of water in a saturated solution of KCl at 50C?
How many grams of solute are dissolved in 100g of water in a saturated solution of KCl at 50C?
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What is the total mass of the KCl solution at 50C if 42.6g of solute is dissolved?
What is the total mass of the KCl solution at 50C if 42.6g of solute is dissolved?
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What is the mass percent of a KCl solution at 50C?
What is the mass percent of a KCl solution at 50C?
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If the KCl solution is heated to 100C, how much more KCl can be dissolved?
If the KCl solution is heated to 100C, how much more KCl can be dissolved?
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What caused double displacement reactions to occur in the experiment?
What caused double displacement reactions to occur in the experiment?
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Write the equation for the decomposition of sulfurous acid.
Write the equation for the decomposition of sulfurous acid.
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Arrange Pb, Mg, and Zn in order of their activities, listing the most active first.
Arrange Pb, Mg, and Zn in order of their activities, listing the most active first.
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Arrange Cu, Ag, and Zn in order of their activities, listing the most active first.
Arrange Cu, Ag, and Zn in order of their activities, listing the most active first.
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Arrange Mg, H, Ag in order of their activities, listing the most active first.
Arrange Mg, H, Ag in order of their activities, listing the most active first.
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Arrange the following metals: Mg, Zn, Pb, Cu, Ag in order of their activities, listing the most active first.
Arrange the following metals: Mg, Zn, Pb, Cu, Ag in order of their activities, listing the most active first.
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Why can't the position of hydrogen be fixed exactly in the activity series?
Why can't the position of hydrogen be fixed exactly in the activity series?
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What additional tests would be needed to establish the exact position of hydrogen in the activity series?
What additional tests would be needed to establish the exact position of hydrogen in the activity series?
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Would silver react with dilute sulfuric acid? Why or why not?
Would silver react with dilute sulfuric acid? Why or why not?
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Would magnesium react with dilute sulfuric acid? Why or why not?
Would magnesium react with dilute sulfuric acid? Why or why not?
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If 50ml of water were added to a sample of KHP instead of 30ml, would the titration require more, less, or the same amount of base?
If 50ml of water were added to a sample of KHP instead of 30ml, would the titration require more, less, or the same amount of base?
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How many moles are represented in 1.106g of KHP?
How many moles are represented in 1.106g of KHP?
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How many moles of NaOH are in 18.38ml of 0.1574 M NaOH solution?
How many moles of NaOH are in 18.38ml of 0.1574 M NaOH solution?
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What is the molarity of the base if a student used 1.276g of KHP that requires 19.84 mL of base?
What is the molarity of the base if a student used 1.276g of KHP that requires 19.84 mL of base?
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If Freddy needed to calculate the mass of his KHP sample, what was the calculated mass if his titration required 18.46 mL of base at 0.2987 M?
If Freddy needed to calculate the mass of his KHP sample, what was the calculated mass if his titration required 18.46 mL of base at 0.2987 M?
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What mass of solid NaOH is needed to make 645ml of Freddy's NaOH solution?
What mass of solid NaOH is needed to make 645ml of Freddy's NaOH solution?
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Study Notes
Density Calculation
- Density of metal calculated by dividing mass by the volume of displaced water.
- Displaced volume: 23.7ml - 20.6ml = 3.1ml.
- Density result: 34.17g / 3.1ml = 11g/ml.
Unit Conversion
- To convert from centimeters to meters: divide by 100.
- Example: 45.90cm = 0.4590m.
Role of Manganese Dioxide
- Manganese dioxide (MnO2) acts as a catalyst in the decomposition of hydrogen peroxide.
- It accelerates the production of oxygen gas from the reaction.
Oxygen Storage
- Bottles containing oxygen gas are stored upright to utilize the gas's higher density.
- This position aids in trapping oxygen effectively.
Candle Burning Experiment
- A candle burns longer in oxygen than in air due to higher oxygen levels supporting combustion.
- Combustion is significantly more efficient in oxygen-rich environments.
Chemical Formulas
- AgNO3: Silver Nitrate.
- HI(aq): Hydroiodic acid.
- CuBr2: Copper (II) Bromide.
- Al2O3: Aluminum oxide.
- PbF2: Lead (II) fluoride.
- ChP: Chromium (III) phosphide.
Evidence of Water Formation
- Cobalt chloride paper turning white indicates the presence of water.
- When anhydrous copper(II) sulfate mixes with obtained liquid, it turns blue, confirming water formation.
Chemical Reaction Evidence
- Physical changes like heating and steam production indicate a chemical reaction occurred with anhydrous salts.
Mass Loss Upon Heating
- Decomposition of salts when heated can also lead to mass loss and color change.
Minimum Mass After Heating
- After cooling, minimum mass of a heated sample is calculated by subtracting potential error (0.05g).
Percent Water in Hydrated Sample
- Percent calculation: (mass lost / initial mass) x 100% results in 37.07% water content in the original sample.
Dissolving Rates
- Fine salt dissolves faster than coarse salt due to greater surface area exposure in a solvent.
Solubility Calculations
- For NaCl in saturated solution at 50°C: (37g NaCl/Total weight) x 100 = 27.0% by mass.
- Potassium bromide solubility estimation involves average changes across temperature range calculations.
Additional Soluble Capacity
- Heating a saturated solution can dissolve additional quantities of solute, e.g., 12.6g of BaCl2 at increased temperatures.
Saturation and Percent Mass
- Total mass of a KCl solution at saturation is the sum of solute and solvent weights.
- Mass percent calculation at 50°C gives 29.9% for KCl solutions.
Activity Series of Metals
- Relative activities ordered: Mg > Zn > Pb; Zn > Cu > Ag; Mg > H > Ag.
- Hydrogen's position relative to metals varies based on experimental conditions due to reactivity levels.
Reactivity with Acids
- Silver does not react with dilute sulfuric acid; it is less active than hydrogen.
- Magnesium reacts with dilute sulfuric acid as it is more active than hydrogen and will replace it.
Titration Calculations
- Titration data allows calculation of molarity and masses of compounds involved, for example, using KHP and NaOH.
- Calculate moles of NaOH based on volume and concentration for titration results.
Final Weight Considerations
- The mass of NaOH needed correlates with the created solution's concentration and volume requirements, leading to precise mass calculations for experiments.
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Description
Explore key chemistry concepts including density calculation, unit conversion, and the role of manganese dioxide as a catalyst. The quiz covers practical applications like oxygen storage and the effects on combustion in various environments.
