When faced with a problem a good scientist will use experiments, notes, debates, and more to their advantage to solve the tough questions. A groups of scientists did just that when faced with a problem of their own. A tiny vial with a white powdery substance in it was put in front of them, and they needed to find out what was in it! Faced with nine possible ingredients in the “Mystery mixture,” a well tray, a water dropper, and a toothpick, these scientists were a little overwhelmed, but determined. One of the first things they did was look at the substance and compare it to their own mixtures, using experiments or chemical properties. Chemical properties are a chemical’s reaction to another or more substances, and a change in it’s identity. When they observed the chemicals the students were using physical properties, or observing the chemical’s smell, texture, color, appearance, size, and shape. They believe Baking Soda and Citric acid are in the Mystery Mixture.
The composition of a pure substance is constant, and thus pure substances have characteristic physical properties that do not change and this is why we are able to separate each element in this lab experiment. Examples of physical properties that can be used to describe pure substances include solubility, conductivity, magnetism, density, boiling point, and melting point.
The experiment procedure is first, get your materials, shells, water, vinegar, measuring spoon, a cup, and a beaker. Next,
Every individual is different in a specific way. Like people, substances have unique qualities, such as properties, which aid chemists to differentiate and identify the particular components the substances consists of. These particular qualities are identified as either physical or chemical properties. Physical properties are properties which do not require a chemical change of its composition in order for the substance to be classified. A few examples of physical properties include color, density, odor, boiling point, melting
5. Substances in a mixture can be separated depending on the substances involved. You can use a magnet to separate a magnetic substance form a non-magnetic one, filtering, and evaporation. For example, when I put 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.
Hypothesis: If we use these materials and use magnets, water, burners, and filters on the mixtures and elements given we should determine what kind of effect these materials given will have on these mixtures and elements, physical or chemical.
6-3: This process is used by cells to manufacture _biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products__
Physical changes occurred in four out of the eight experiments completed in this lab. The first was experiment one, the salt and water. The salt was added to water but when the water evaporated the salt remained. The water changed to the vapor form of water and the salt did not change. The second was experiment two, the candle. When the candle was lit the heat given off from the fire melted the wax beneath it. Melting is a physical change because the liquid wax is still wax, its usual form is just a solid. Experiment four dealt with ripping paper. This was a physical change because, although the paper was being ripped apart, it was (and still is) paper. The smaller pieces did not change the mass or any other factor of it except the surface area of each piece. Experiment seven dealt with vinegar being added to milk. The vinegar did not change but the milk was curdled by the vinegar. Although the milk was curdled, the milk remained milk. The composition stayed the same. Each of these experiments showed no change in a substance so as it changed to another substance.
Chemical and physical properties of substances are due to the structure and arrangement of atoms, ions or molecules and how these interact with each other
Change in color once chemicals were combined (experiments b,c,d,e,f,g,h,j,l); Precipitate formation (experiments g,j,l), and formation of gas bubbles (experiment a).
Someone hands you a container of a mysterious white mixture, and they give you the task to figure out what it is. What would you do to solve the problem at hand? Many scientists might find physical and chemical properties to figure it out. The scientists might look for, odor change, temperature change, fizzing, and bubbling for chemical properties. They also inspect the mixtures for physical properties before a chemical reaction occurs, including shape, size, color, texture, and smell. The Eighth grade thinks that the mystery mixture is C6H8O7(Citric Acid) and NaHCO3(Baking Soda).
To discover and observe what happens inside a ziplock bag when three substances are mixed together.
The Chemical Baggies Lab demonstrated to students how certain chemicals cause diverse chemical or physical changes depending on what substances were mixed together in a designed controlled experiment. During the process of this experiment, almost identical observations were made about different combinations of chemicals that had at least one substance in common. For example, the frequent observation that was made throughout the experiment was that heat was felt. Even though there were distinct chemical combinations, there was one substance that generated a certain observation or characteristic, such as a mixture has to comprise of the phenol red for there to be a color change, which was learned from this lab. Also, calcium chloride
The purpose of this lab is to use chemical and physical properties to identify a material. We are working on observing, inferring and predicting. We are learning if the properties of materials that appear similar can be used to tell them apart.