There’s a difference between a chemical and physical prop-erties/changes. Physical properties are an aspect of matter that can be observed or measured without changing it. The Examples for Physical properties would include: color, smell, freezing point, boiling point, melting point, etc. While Chemical properies may only be observed by changing the chemical identity of a substance. An example for Chemical properties would be rusting iron. Physical change rearranges molecules but doesn't affect their internal structures. Examples of this change would be a substance can go from a solid to a liquid, a liquid to a gas, a gas to a liquid, a liquid to a solid, and a solid to a gas. Chemical change is any change that results in the formation of new …show more content…
First lab. The burning of the strip of magnesium causes it to ignite a bright spark, leaving the burnt remains in to white ash. The result is a CHEMICAL CHANGE. Because once you burn it, you couldn’t turn the white ash back to its original form. Second lab:. Third lab: when I mixed the Sodium Hydroxide with water, the mixture change to the color pink. The result is a CHEMICAL CHANGE. Because you couldn’t change the pink color back to clear water before it was poured with Sodium Hydroxide. Fourth Lab: When I mixed the Baking Soda with Vinegar, it fizzes up to the top of the beaker. The result is a CHEMICAL CHANGE. Because the Baking Soda is already in the Vinegar and you couldn’t extract it out once it fizzes. Fifth Lab: the mixture of Baking Soda and water resulted with a semi-greyish color within the beaker. The result is BOTH A CHEMICAL AND PHYSICAL CHANGE. Because even though the mixture resulted to a different color, you could evaporate it and bring back the baking soda as it was while the water itself extracted. Sixth Lab: When I poured a bit of Vinegar to the beaker of milk, it quickly break up the milk into clumps which produced a “sour” odor similar to spoiled milk. The result is a CHEMICAL CHANGE. Because the Vinegar turned the milk into cheesy chunks and you couldn’t turn it back to its original liquid form. And the Seventh lab: After I mixed the drops of Potassium iodide and Lead Nitrate, its color turned into neon green. The result is a CHEMICAL CHANGE. Because the mixture changed into an unexpected color since the Potassium iodide has the color brown, and the Lead Nitrate is a clear liquid, when mixed turned to neon green and you couldn’t separate them back to normal. Now for the Heat Curve Lab. During the 12 minutes of heating the beaker of water and ice while reading the changes of its temperature of the thermometer sticking inside. It started out slow at first, but until about four minutes later the
Many signs show that a chemical reaction has occurred. Some ways we know there is a chemical reaction are the formation of gas, formation of precipitate, change in temperature, and,or change in color. In part one of the experiment, we know there was a chemical change because of the formation of the white precipitate. We poured the ammonia and water in the flask with alum and water, forming a white, cloudy substance in between the two liquids. The white, cloudy substance between the two is liquids is also known as aluminum hydroxide. The second part of the experiment was very similar to the first, but in the second part we mixed epon salt, water, and ammonia. The precipitate formed from mixing the epson salt, water, and ammonia was called magnesium hydroxide.
Day 1. Michael was coming home for vacation from college. When he got home he found out that
One of the signs of a chemical change is that sound is produced. The oxygen, fire and hydrogen react together, creating a popping noise (this is the hydrogen combusting).
Procedure: In this experiment, various chemicals were mixed together, to determine a reaction. Using two drops from chemical 1 and two drops of chemical two, unless otherwise stated, then recording the type of physical reaction or color changes that occurred.
Substances A and B have an appearance of a white solid like. Substances A and B were put into a test tube and on the Bunsen burner. As a result, B melted faster than A. A was slow to melt. The reason why B melted faster than A is because it has a lower boiling point than substance A which made it melt faster. It also shows that A needs more energy than B to be broken down.
One type of chemical reaction, called combustion, involves the burning of various compounds and elements. Some substances are more
Purpose: The purpose of this experiment is to observe a variety of chemical reactions and to identify patterns in the conversion of reactants into products.
6-3: This process is used by cells to manufacture _biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products__
The first experiment is about the combustion of magnesium after which the ash is formed.
When the zinc was dropped in the hydrochloric acid, the substance began bubbling vigorously, forming a precipitate. Eventually, the zinc dissolved completely. After the lit wooden splint broke the surface of the test tube, there was a loud popping noise. The gas that was released was hydrogen from the acid and the popping noise was a result of the Hydrogen being burned up by the fire creating a small explosion. Two chemical changes occurred in this test: one with the formation of a precipitate (a textbook sign of a chemical change), and the other when the explosion
These reactions can be seen from just a little bit of reaction all the way up to a complete change of the entire sample tested. Some samples of those tested in this experiment which showed the chemical reaction were the baking soda/ammonia mixture, the Epson salt and baking soda mixture as well as the food coloring mixed with the baking soda and bleach. 2. Which reactions, if any, do you believe showed no evidence of chemical change? Justify your reasoning.
A chemical reaction is when substances (reactants) change into other substances (products). The five general types of chemical reactions are synthesis (also known as direct combination), decomposition, single replacement (also known as single displacement), double replacement (also known as double displacement), and combustion. In this lab, the five general types of chemical reactions were conducted and observations were taken before, during, and after the reaction. Then the reactants and observations were used to determine the products to form a balanced chemical equation. The purpose of this lab was to learn and answer the question: How can observations be used to determine the identity of substances produced in a chemical reaction?
A chemical change is an irreversible reaction that involves the changing of the substances chemical properties and results in the creation of a new substance. A physical change is a change that affects the physical aspects or form of the substance, but not tis chemical properties. This type of reaction can be reversed and a completely new substance is not formed. So, to know if a chemical change has taken place the many thing to look for is if a new substance is created from the reaction. Experiments can be tested to make sure that no form of a chemical change has taken place if a person is unsure about whether a reaction is physical or chemical.
Chemical changes happen on a molecular level when you have two or more molecules that interact. Chemical changes happen when atomic bonds are broken or created during chemical reactions. Anything that is burning is a chemical change. Or frying an egg is a chemical change cause it can not go back to wear it was before theres no fixing.
A few more important terms to keep in mind when doing a lab with chemical and physical changes are