Lab Report Essay

Then the mass of the copper metal and the percentage of Cu were obtained and compared throughout different groups and a mean and standard deviation was calculated for the

This shows that these substances conduct electricity as a solid. The next test was conductivity as a solution. From our findings, sucrose had poor conductivity, while ascorbic acid and sodium chloride had good conductivity. Ascorbic acid conducts electricity because

Metal cations can be identified based on the colors they emitted off when heated in a flame.1 When atoms of the ions that were tested are excited, their electrons move up to higher levels of energy.2 When the electrons relax and return to the original states, they emit photons of specific energy creating wavelengths of light that produces colors.3 The test wire and Bunsen Burner were used to excite the solution in the crucible. The standard metal cations that were tested and their outcomes are as shown in Table 1.

The quantitative solubility of the unknown compound was determined to be 29/100ml. The known solubility of sodium sulfate is 28.11g/100mL water. Using the found solubility to compare to the known solubility of sodium sulfate. This solution created in the solubility test, the conductivity of the unknown compound was tested using an Ohmmeter to measure the resistance of the solution. Resistance is the measure of a substances ability to conduct

Buggin’ Out (Buggy Lab) Purpose - To determine the motion of a battery powered buggy & use the data to determine when the two buggies would collide. Data - Position (m) Displacement (m) Time 1 (s) Time 2 (s) Time 3 (s) Time 4 (s) Average Time (s) Velocity (m/s) 1 0 0 0 0 0 0 -- .5 -0.5 1.74 1.38 1.44 1.66 1.53 -.333 0 -1 3.03 3.00 2.95 2.85 2.96 -.338 -.5 -1.5 4.44 4.28 4.44 4.41 4.39 -.342 -1 -2 5.81 5.25 5.65 5.83 5.64 -.354 3.

• ionic compounds can only conduct electricity if their ions are free to move. Ionic compounds only conduct when they are melted or dissolved in water and they do not do not conduct electricity when they are solid. Sodium chloride– it is soluble in water, it has high boiling and melting point, it does not conduct in its solid state, except when it dissolves in water or melted then it will conduct electricity.

For the unknown phase two project, I was assigned unknown number one. After many tests, I came to the conclusion that my unknown was Acinetobacter baumannii. It had cultural characteristics of yellow or clear colony pigmentation, smooth and translucent surface, circular form, smooth margin, and flat elevation. The unknown’s broth properties included a ring, turbidity, and sediment.

The group hypothesized that if worms in a bottle had dirt, compost, oxygen, and a good environment they would survive, reproduce, and improve soil. The groups hypothesis was partially supported by this experiment. For one, most worms did not survive. By the end of the experiment 5 worms remained although the group started out with 27.

A way to encourage scientific enquiry in the classroom is through the use of practical investigations. In the context of thinking and working scientifically, investigations are activities where children can use their conceptual understanding and knowledge of science to find solutions to problems and questions (Skamp, 2012). Supported by Ward et al. (2006) who say that the term investigation is used for activities requiring children to make choices about what to change and measure. Instances where science lessons are practical and focus on the development skills linked with scientific enquiry and where emphasis was placed on the children carrying out investigations independently, were the most beneficial (Ofsted 2010).

I. Purpose: To measure conductivity of solutions. To classify substances as conductors, partial conductors, or nonconductors. To relate conductivity to bond type. II. Materials:

When electrolytes, like sodium chloride, dissolve in water, the crystals separate and become ions. Ions are conductors of electricity; the more ions in water, the better it can conduct electricity. For example: salt and tap water have more ions in them than deionized water, which is pure and doesn’t have ions in it, so it won’t conduct electricity as well. Other good conductors of electricity include metals such as copper and aluminum. Objects that don’t conduct are called insulators; these include objects like rubber, glass, and plastic.

So where do they get these animals? Dogs and cats may be purchased from dog pounds or puppy mills. They may be caught in the wild or animals from an overpopulated zoo. Some species were driven to near extinction. Trapping wild monkeys in India diminished entire populations of them.

Animal cruelty is a very cruel subject because animals do not need to be tested on because animal testing and animal experimentation should not happen. Animals do not need to be tested on because they are too scared to try it on themselves so they go and test on innocent little animals because the animals cannot say anything about pain or if they are allergic to the thing they inject them with. Animal cruelty is not humane because experimental research and testing. For experimental research they like to experiment on animals because they don’t want to try the stuff that they use in the animals on their self they use the innocent little creatures that might eventually die from being experimented on so much and them not giving the little animals

Water Testing Water is one of the most common elements that we use in our day-to-day lives. Because it can be used in a multitude of scenarios, its especially important to make sure that the quality of the water that you are using is as high as possible. At eWaterCompany we offer the best solution for water testing. Our specialists have more than 15 years of professional experience, and are always at your service.

Testing on Animals For many decades, using animals for testing has become one of the many controversial topics. Experimenting on animals can be beneficial but can be misleading when an animal has a different response than a human. Animals have as much rights as humans do but are still being violated. And even when there has been laws and acts passed to protect them, they are still being used in many laboratories in the United States.