Hot Dogs Lab

A control group should be used in an experimental study because you need an independent variable to base your test off of. This variable cannot influence the results. A common example of a control group is one that is held at ordinary conditions so there is no changing variable. For example, if you want to experiment on the effects of fertilizer in plant growth, a control group would be a plant or plants that are not given fertilizer. The experimental group would receive fertilizer. The control group then provides a baseline to see if the experiment had any effect.

A variety of receptors could have responded to subtle stimuli. Since the temperature was not tightly controlled in the experiment, thermoreceptors could have

The controlled variable helps identify if the manipulated variable changes the dependent variable, without it you wouldn't know if that had really affected it or not. The controlled variable must stay the same or the results would be flawed and innaccurate. If you want to see which type of shampoo and conditioner makes your hair grow the fastest you can't cut your hair during the experiment because then you wouldn't know how many inches it had grown with that particular shampoo. Just like you can't change the amount of water you're boiling to see if the salt affects the temperature because the one with less water is going to heat up faster than that of the one with more whether it has the salt or not leading you to a false

2C. A control group is usually not tested around the independent variable, so it's kept away. A controlled variable is a variable you yourself can control during an experiment.

The experiment had four different temperature 12 ̊, 51 ̊, 75 ̊, 111 ̊. In the experiment it was about how temperature effects the air pressure of a basketball. The one thing that would change the experiment is recording the bounce because participants had to get the bounce and the measurement. The highest bounce was the hot ball that was 111 ̊it bounce high. The lowest bounce was the frozen ball that was 12 ̊ because it barely bounced.

A hot pack is an object that can produce heat in an instant using a chemical reaction. These hot packs have been used to treat injuries, reduce muscle pain and cramps, and simply provide warmth. The use of hot packs is not a new technique, but modern science has helped to increase the speed and dependability of hot packs over the years. This lab posed the challenge to create a hot pack that reacted Calcium Chloride (CaCl2) with 100 milliliters (mL) of water (H2O) to reach the specific temperature of 55o Celsius (C). CaCl2 produces heat when it reacts with H2O because when the CaCl2 is mixed with H2O, the CaCl2 is instantly broken apart into individual ions by the energy in the H2O. The ions then form attractions to the water and, in the form

We kept our experiment reliable and accurate by having a thermometer in the beaker the whole time and letting the thermometer cool down between each experiment.

Controls are the standards. They can show what the experiment would normally happen or not happen. By comparing the controls with the experimental trials, we can tell whether the independent variables have an effect on the cells (and sometimes it can indicate if there is contamination throughout the experiment).

This experiment was designed to test the hypothesis that a glass of ice will melt quicker when left in higher temperatures. The purpose of this assignment is to determine where a glass of ice should be stored so that the ice will melt at the slowest rate. A student carefully set up this experiment with two identical glasses each containing three ice cubes of equal size and shape. The student then placed one of these glasses in a room with a steady temperature at 74°F and the second glass outside, which held a temperature of 90°F. The independent variable in this experiment is the temperature of the surroundings while the dependent variable, the variable that the student will

The hypothesis was that ice will melt faster on metal materials, and slower on other surfaces like wood cutting boards or plastic. My group’s data supported this hypothesis, because the ice cubes put on the metal surface melted much faster than on wood or plastic. The only variable that changed during the experiment was the material on which the ice melted. Other potential variables that my group attempted to avoid changing were the size of the ice cube, keeping the ice cubes identical, how the ice cube is stationed on the material, keeping it flat on the material, and how long the ice cube was in my hand before touching the material. Potential causes of error include holding the ice cube in my hand for too long, not starting the timer at the

To conclude if a treatment had effect, a research will compare the experimental group to the control group. In a controlled experiment there are two or more things being compared. However, there is only one variable (IV) that will be changed, meaning that the some participants will not receive the experimental treatment. The participants are randomly selected to be in the control group.

the independent variable is very important in order to answer the question; did the treatment make the

The purpose of the Anatomy and Chemistry of the Human Liver Lab is to understand and observe the functions of the liver in the human body. Throughout the experimentation process, the goal of the lab was to recognize the function of the liver when the organ becomes exposed to hydrogen peroxide and be able to classify the chemical reactions that take place during the process. My original prediction, or hypothesis, is: if a section of a liver, accompanied by a catalase, is exposed to hydrogen peroxide then the chemical reaction that will occur will be decomposition and exothermic. During the experimental process, three trials were performed and recorded with equivalent amounts of chicken liver, weighing .55 grams each, while reacting in the same amounts of hydrogen peroxide,10 mL. Before performing our trials, we measured the constant temperature of the hydrogen peroxide, which was 23.7 degrees Celsius. The first trial began with a temperature of 23.6 degrees Celsius, and rose to a finishing temperature of 24.1 degrees Celsius. As for trial two, this experiment was performed the next day, and had a starting temperature of 24.6 degrees Celsius and ending temperature of 25.8 degrees Celsius. The third trial, also performed the next day, the starting temperature was also 24.6 degrees Celsius and the ending temperature was 26.3 degrees Celsius, measuring as the highest increase in temperature among the trials. The increase in temperature enabled the observation of energy in the

The main purpose of this experiment was to find the positive constant “K” for different liquids in the Newton’s Law of Cooling equation, in order to determine when it was safe to store food products in commercial restaurant after cooking. The high risk temperature for bacteria growth is between 5 and 60 degrees. However putting hot food into your fridge before this point can cause food poisoning especially in deep containers, which is why it is vital that food companies and chiefs are aware of how longer a food, takes to cool down from an approximate temperature. Obviously an exact value is impossible because of varying variables e.g. room temperature, depth of container etc. However by applying newton’s laws you

Figure 1) From 0 to 16 minutes for the ‘centre’, the highest decrease in temperature from the initial to final temperature (in trial 3) was The ‘outside’ and ‘isolated’ dropped by (trial 1 and 3) and (trial 2), respectively. This suggested the ‘isolated’ had the greatest decrease in temperature of the other two. This corresponded to a greater heat energy lost and thus, meant being separated from the bundle was not the most ideal place to be when conserving energy. As the test tubes represented penguins it was possibly to infer that a penguin likely loses more heat energy than a penguin part of a huddle (either within or on the boundary). This idea is supported in figure 2 where the ‘isolated’ showed the highest overall temperature