| 1. | | Passing an electric current through a certain substance produces oxygen and sulfur. This substance cannot be a(n) Your Answer: | element. | | | An element cannot be broken down into other elements. | | 2. | | Pick the chemical change that occurs when a lit match is held under a piece of metal. Your Answer: | match burns | | | Chemical changes‚ which release heat and light‚ occur during the combustion process. | | 3. | | Which identification is incorrect for the elements
Premium Temperature Chemistry Chemical reaction
Independent Research Task- Ellen Ryan The Effect of Water Temperature on the time taken to dissolve Salt Aim: To see the effect of water temperature on salt. Hypothesis: If the temperature of the water is increased the time taken for the salt to dissolve completely will be shorter. Equipment Heat proof mat Tripod Bunsen burner Gauze mat Electronic Balance 2 beakers Measuring cylinder Salt Water Stirring rod Thermometer Safety glasses Stopwatch Plastic spoon Method:
Premium Temperature Fahrenheit Heat
Aim: In this investigation I will be measuring the effects of temperature on the membrane permeability of beetroot. I will be measuring the amount of anthocyanin that will diffuse out of the beetroot. The way in which I will measure the anthocyanin is to check the light absorbency of the solution using a colorimeter. The higher the reading on colorimeter the more anthocyanin present in the solution To find out the permeability of the beetroot membrane I will firstly cut out cylinders of beetroot
Premium Laboratory glassware Energy Molecular diffusion
EFFECT OF ROOM TEMPERATURE ON THE BURN-RATE OF A CANDLE BURNS Have you ever wondered whether a candle burns more quickly on a hot day‚ than on a cold day? Or is it the other way around? This science fair project was carried out to compare how quickly a candle will burn at different room temperatures. The experiment was done by measuring how much of a candle will melt in 30 minutes when placed in an environment with surrounding temperatures of 20°C‚ 25°C and 30°C. Hypothesis A candle in a colder
Premium
Evaluation Like any experiment‚ there were a number of potential errors during the procedure of the experiment. Errors could have arisen as a result of the uncertainties associated with the instruments I used to take measurements‚ and also as a result of errors associated with the actual method. Of course‚ due to the limitations of the procedure‚ they could not be eliminated completely‚ so I will explain what I did to reduce them to an acceptable level and how I could have improved my method to
Premium Laboratory glassware Measurement
Plan:- Independent Variable- Temperature is what I will be changing in the experiment. I want to find out what effect temperature has on the permeability of a cell membrane. Controlling other Variables- I will use measures to ensure that everything stays the same in my test to gain the best and most reliable results possible - Same volume of water that I put the beetroot into after heating. - The beetroot I use will be the same size each time‚ I will ensure this using a cork borer. - The beetroot
Premium Cell membrane Protein Temperature
Bacterial Meningitis is a horribly life shacking disease. Bacterial Meningitis can be a very destructive disease it can leave people with horrible and lasting aftermath if survived but if not it could destroy the brain leaving it black and rotting. Bacterial Meningitis has many symptoms‚ ways of spreading‚ treatments and prevention for this horrible disease‚ and it’s very interesting history and how things about it changed. The History of Bacterial meningitis is full of breakthroughs and outbreaks
Premium Infectious disease Immune system Infection
When a population grows rapidly‚ it can put great stress on an area such as a community or a country. When sudden extreme population growth occurs‚ food will become a prized possession‚ more people will die due to disease and war‚ and the economy will be affected. As a population grows‚ all the additional people will need food immediately to survive. There will not be time to develop new sources of food over many years. Instead‚ more and more people will need food more and more and the food will
Premium Population The Nation Population growth
Eucalyptus and Colloidal Silver. Obtain two nutrient agar plates and using a permanent marker draw four quadrants on the bottom of each agar plate. Using a sterile pipet transfer 250 ml of E. coli broth to the middle of each petri dish and evenly spread bacterial culture around the agar plate. Cover and allow the culture to soak into agar for at east 15 minutes. Using sterile forceps‚ carefully place one filter disk from designated sample into the middle of each
Premium Bacteria Microbiology Escherichia coli
Bacterial Vaginosis is a bacterial infection. This STD occurs when there is an overgrowth of bacteria that is normally present in the vagina. BV can only be spread through female sexual interactions. Males are not able to get this STD because they do not have the same bacteria as women. There are rarely ever any extremely noticeable symptoms. Some symptoms of bacterial vaginosis include; abnormal vaginal discharge‚ vaginal itching‚ odor‚ and/or burning when urinating. Since the symptoms can be unnoticeable
Premium Immune system AIDS Sexual intercourse