Physical And Chemical Changes Essay

Physical And Chemical Changes Term paper

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Physical And Chemical Changes
Purpose: To conduct experiments and to determine whether they are physical or chemical changes Pre-Lab Notes: Before we conduct these experiments there are some topics that we must discuss. As ...
Purpose: To conduct experiments and to determine whether they are physical or chemical changes Pre-Lab Notes: Before we conduct these experiments there are some topics that we must discuss. As I stated in the purpose, in this lab we are going to be looking at some experiments, and we have to determine whether they are a cause of chemical or physical changes. The purpose for all the labs that we will be doing will be the same. During a chemical
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change a new substance is formed, it is irreversible, and it is usually accompanied by energy changes. In comparison, during a physical change no new substance is formed, it is easily reversible, and it is usually accompanied by energy changes. An example of an energy change would be heat or light. Just to give you can example of a chemical change this would be burning a piece of wood. This is because the wood is mixed in with oxygen to
cheese
Water Degradation Based on the article: River Life Through U.S. Broadly Degraded. By William K. Stevens, Jan. 26, 93 Society has been presented with a broad ...
make a change. The name of the starting substances during a chemical change is reactants and the name of the new substance is the product. An example of a physical change would be water to ice, because the ice can easily be changed by into water, but by the change of temperature this physical change occurs. When mixing chemicals together it is important to understand what solvent and solute is. Solute is the solid that is dissolved in the liquid.
Stereochemistry Considerations
Stereochemistry Considerations What would you think if I gave you a drug and said this is going to help you but I want you to know ahead ...
The name of the liquid is the solvent. It is important to know this, because in experiment one mixed solvents and solutes together quite frequently. Before conducting any experiment it is very important to take note of what type of state ones materials are in. There are three different types of states that we will look at now are Solid, Liquid, and Gas. A solid has a definite shape and is tightly packed and very close to each other that
Chemical and Phisical Changes
Title: Chemical and Physical Changes. Purpose: To determine the differences between chemical and physical changes when they happen. Materials: Five test tubes, Bunsen burner, crucible, test tube holder, triple ...
they can't move. An example of a solid would be a desktop. A liquid flows very easily and takes on the shape of its container. A liquidís particles are less packed together compared to a solid, and are able to slide past each other and an example of a liquid would be water. The last state that we need to go over is gases. A gas is able to expand and take on the shape and volume of its container.
Chemical And Phisical Changes
Title: Chemical and Physical Changes. Purpose: To determine the differences between chemical and physical changes when they happen. Materials: Five test tubes, Bunsen burner, crucible, test tube holder, triple beam ...
Gas has particles very loosely collected and able to move freely with space between them, which makes it different from the other two states. An example of a gas would be oxygen. When matter goes from a solid to a gas this is called sublimation. Not many substances can go through sublimation. The opposite of sublimation is disposition. This is when matter goes from a gas state to a solid state. These three terms are important to know, because during
Chemical Engineering
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physical and chemical changes the state of one object often changes, (refer to page one of attachments to compare the diagrams of a solid, liquid and gas). We are going to conduct a series of eight experiments and now that we have all of this background information we will be completely ready to start. Lab #1 Title: Physical and Chemical Changes Materials: Candles Aluminum foil Matches Procedure: 1. put a piece of aluminum foil on the bottom of the candle
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2. light the candle 3. observe what happens Hypothesis: Will be a physical change, because it can be reversed by cooling, no new substance is formed. Observations: BEFORE LIT Clearly has been used before 2.5 inches long Piece of tin foil is on the bottom The wick is black The candle is in a solid state ONCE LIT The light is burning bright and strong Wax is beginning to form (liquid state) Smell of smoke as a result of the
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fire mixing with oxygen Heat is coming from flame Analysis: The candle did stay in the same state and no new substance was formed. Before trying this experiment the wick was black and clearing it went through some sort of change, probably because it was mixed with Oxygen in the air. When I observed the candle I couldnít understand the relevance of the aluminum foil. It didnít seem to be important to me because I didnít observe the candle until
Analytical Chemistry
Analytical Chemistry Analytical Chemistry is the branch of chemistry principally concerned with determining the chemical composition of materials, which may be solids, liquids, gases, pure elements, compounds, or complex ...
it was fully melt. Maybe there would have been some sort of reaction between the candle, wick and aluminum foil if we waiting for it to burn down. Conclusion: The hypothesis was correct in that the candle went through a physical change. I do though think that the wick went through some sort of chemical reaction because the wick was burnt, which is a sign of a chemical change. The wick can never be turned back to its normal start
untitled
Analytical Chemistry    ;Analytical Chemistry is the branch of chemistry principally concerned with determining the chemical composition of materials, which may be solids, liquids, gases, pure elements, compounds, or complex ...
which is a sign of a chemical change. LAB #2 Title: Physical and Chemical Changes Materials: Watch glass Stirrer Copper Nitrate (Blue Color) Sodium Carbonate (clear) Procedure: 1. Put 2 drops of each chemical on the extreme ends of the watch glass ( donít let them touch) 2. Put a piece of white towel on the bottom ( so you can see more clearly) 3. Use stirrer to put 2 chemicals together Hypothesis: Chemical change Observations: The color became lighter
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Analysis: When the two chemicals were mixed together the color is the online thing that changed. The color became a light blue color. Conclusion: this project was clearly chemical because a new substance was formed and it can not be changed back to its original state. It was not accompanied by energy changes, but not all-chemical changes are. LAB #3 Title: Physical and Chemical Changes Materials: 2 test tubes Test tube rack/ 9 holders Barium Chloride (colorless) Inc Sulfate
Albert Jung
Abstract: This lab assignment is to observe certain substances and observe its physical and chemical changes in different environmental conditions. We first observed its physical properties, such as ...
(colorless) Procedure: 1. Put a small amount of the solution in one tube. 2. Put the other solution in the other test tube. 3. Pour them into each other Hypothesis: chemical change. Observations: Once put together a milky white substance began foaming Residue was left of the sides of the test tube Looks like a thicker substance Unable to look through the test-tube like before Analysis: the two substances were able to form a milky substance. This experiment is clearing
Physical and Chemical Weathering
Weathering is defined as "the break down or alteration of rock in its natural or original position at or near the Earth's surface through physical, chemical, and biological processes induced ...
a chemical change because a new substance was made and it is irreversible. Conclusion: Like the last experiment this substance was a product of mixing two reactants to make a new product, and they both were chemical changes. LAB # 4 Title: Physical and Chemical Changes Materials: Beaker (Copper) cupric chloride crystals Aluminum foil Stirrer Water Scoop Procedure: 1. put a small amount of cupric chloride
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