summary
The given lab experiment had two parts within it.. The purpose of this assignment was to help student make better prediction, to observed chemical reactions, to designing the experiment, and to make a claim from the results of the experiment. The two activities that will be completed are Activity A: Sink or Swim , and Activity B: Dissolving Chemicals in Water.
Claim
The first Activity was to determine the bouncy between two objects. To determine with of the two would sink or swim ( float). From the given information from the lab claim A stated that that the object with greater density then water will prove to sink thought the water reaching the bottom. While the object with the lightest density would float or stay more above the water line.
However the claim for active B was for a different approach. This active
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the comparison was first shown for the glass shaped stopper and plastic stopper was to obtain the weight of each item. The weight of the glass stopper was about (11.437 g) and the plastic stopper weighed (2.322 g), easily presenting which one has the greater possibility of sinking. However the claim was greater solidified thought the action of getting the density of the two objects.
Analysis of evidence When doing the experiment we observed the plastic stopper floated with half of it object. While the glass stopper sunk to the bottom under a second. now to find the density of each object we used the density formula. which is by having mass divided by the volume. We also found the density of the water by getting the mass of just the becker and water within the beack. to be subtracted by each other getting the mass of the water it self. The mass fo the water was dived by the bolum (100 mL) causing the water density to be 0.92269
It was then placed in the ice bath, in which immediately the can slightly collapse on itself. In part two of the experiment, the prepared ice bath temperature measured at 1°C (T2). While the heated bath temperature stabilized around 85°C (T1) after 5 minutes, where it also began to simmer. The test tube with the rubber stop in the heated bath had no water for the entire 5 minutes. When the test tube was placed inside the ice bath for 5 minutes water appeared to flow inside the test tube. The amount of water that flowed into the test tube measured at 5 mL (Vw). When determining the volume of the test tube in the 100 mL graduated cylinder with 30 mL of water, it displaced the water up to 74 mL. Thus determining the volume of the test tube as 34 mL
In the experiment these materials were used in the following ways. A piece of Veneer wood was used as the surface to pull the object over. Placed on top of this was a rectangular wood block weighing 0.148-kg (1.45 N/ 9.80 m/s/s). A string was attached to the wood block and then a loop was made at the end of the string so a Newton scale could be attached to determine the force. The block was placed on the Veneer and drug for about 0.6 m at a constant speed to determine the force needed to pull the block at a constant speed. The force was read off of the Newton scale, this was difficult because the scale was in motion pulling the object. To increase the mass weights were placed on the top of the ...
The objective of this experiment will be to combine various substances, liquids and metals, and to observe their behavior when they are combined. The types of reactions observed shall determine the nature of these reactions: physical or chemical.
For this experiment we have to use physical methods to separate the reaction mixture from the liquid. The physical methods that were used are filtration and evaporation. Filtration is the separation of a solid from a liquid by passing the liquid through a porous material, such as filter paper. Evaporation is when you place the residue and the damp filter paper into a drying oven to draw moisture from it by heating it and leaving only the dry solid portion behind (Lab Guide pg. 33.).
Also, the temperature of the bath water should be recorded. For the next 15 minutes, the location of the dye should be recorded. Also, the temperature of the bath water should be recorded every other minute. All the data should be recorded in table one and used for analysis.
states that "a body immersed in a fluid is buoyed up by a force equal the weight
Input variables In this experiment there are two main factors that can affect the rate of the reaction. These key factors can change the rate of the reaction by either increasing it or decreasing it. These were considered and controlled so that they did not disrupt the success of the experiment. Temperature-
Experiment: First prepared a well plate with the appropriate amounts of distilled water, HCl, and Na2S2O3 in each well according to the lab manual. The well where the reaction
In a 100ml beaker 30mls of water was placed the temperature of the water was recorded. 1 teaspoon of Ammonium Nitrate was added to the water and stirred until dissolved. The temperature was then recorded again. This was to see the difference between the initial temperature and the final temperature.
== = == Hypothesis for the experiment: After I conduct this experiment, I expect and suppose I can recognize and physical changes, identifying the difference these two kinds of changes. Also, I will be able to know some physical and chemical properties of copper (II) sulfate, water, iron, sodium carbonate, hydrochloric acid and magnesium and identify if it is a chemical change or physical change in each part of the experiment.
Generally pycnometer is made of glass, with a clos-fitting ground glass stopper with capillary tube through it, so that air bubbles mas escape from the apparatus. This device enables a liquid density to be measured through an appropriate working fluid, such as mercury or water, using analytical balance. When the flask weighed empty, full of water, and full of a liquid whose relative density is desired, then relative density can be easily calculated. The specific gravity results show that subsoil specific gravity varies between 2.45 and 2.7. Pycnometer analysis work system shown in Figure 12.
acid and water to see how it affects the rate of reaction. I will use
Now let’s get into some examples of buoyancy. What if you put an ice cube into a glass of water. When the ice cube moves some of the water will become its own. The water level rises and floats in and out of the water. Gravity is pulling the ice cube down and the buoyant force is pushing it up. This is a little project you can do at home. Think about what happens when you put an ice cube into a glass of water. As the ice cube moves some of the water to make way for itself, the water level rises and floats partially in and out of the water. Gravity is pulling the ice cube down and the buoyant force is pushing it up. As we know things float because they are less dense in water. Did you know that because of this it is easier to lift a heavier person in a swimming pool? Steel ships float because even though steel is denser than water, their hulls are full of air. Ships float on how different the heights are. Ships float higher in dense cold seas than in warm tropical ones which mean they also float higher in the winter months. Some heavy ships get lowered by letting seawater in and then it is pumped out of the buoyancy
A great explanation for surface tension is “The property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules.” (https://water.usgs.gov/edu/surface-tension.html) Which means, that since the water molecules are bonded together at the surface, they are strong enough to keep an item with much higher density from sinking below