These supplies are needed:
distilled water
0.1 M HCl (8.3 mL concentrated HCl per 1 L of solu...
These supplies are needed:
distilled water
0.1 M HCl (8.3 mL concentrated HCl per 1 L of solution)
CAUTION: WEAR GOGGLES! HANDLE CONCENTRATED ACIDS UNDER ADULT SUPERVISION IN AN AREA WITH ADEQUATE VENTILATION. ALWAYS ADD ACID TO THE PRE-MEASURED WATER.
0.001 M HCl (1 mL 0.1 M HCl per 100 mL of solution)
0.00001 M HCl (1 mL 0.001 M HCl per 100 mL of solution)
marble, limestone, or chalk chips
pipette (glass with suction bulb or disposable)
4 test tubes
goggles
Follow these directions and complete the activities.
Set up four test tubes in a rack.
Add a small marble chip to each of the test tubes.
Add 1 mL samples of acid solutions as labeled in the chart.
Start with the weakest solution (distilled water) and work your way up in concentration. In this manner, you may use a single pipette for the entire experiment. Each test solution will simply increase the density of ions added to the chalk. Can you understand why you cannot return to a weaker solution with the same pipette?
Observe whether reaction takes place and how fast. Record your results.
Pour the acid solution from each test tube into the sink.
Rinse the marble chips with water and place them in a container for this purpose to be used again.
Observations:
Data Table:
distilled water 0.0001M HCl 0.001 M HCl 0.1 M HCl
strength of reaction
speed of reaction
Analysis:
Marble is made from limestone under the influence of heat and pressure. The chemical formula for limestone or marble chips is CaCO3. When you added the chips to the acid solutions, they effervesced (bubble or foam).
What is the gas that is produced?
What is the chemical formula of the gas?
How could you test rocks for the presence of limestone?
Write a balanced symbol model for the reaction of limestone with hydrochloric acid.
Answers: 1
Chemistry, 21.06.2019 20:30, nmadrigal
In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask
Answers: 2
Chemistry, 22.06.2019 10:00, JOEFRESH10
Suppose the universe were completely empty except for one object-a solid sphere moving through space of 100 km/s. what sort of path would the object be moving in? explain your answer
Answers: 1
Social Studies, 14.02.2021 18:30
History, 14.02.2021 18:30
Mathematics, 14.02.2021 18:30
Social Studies, 14.02.2021 18:30
Physics, 14.02.2021 18:30
Physics, 14.02.2021 18:30