![]() ![]() In chemistry, the term change can refer to both physical and chemical changes. The video could be then be shared with the students in the LMS or some other online platform. Another option is for the instructor to record a video performing the demonstration. The demonstration can be performed in person and the students can complete the demo handout during the demonstration. It is a good idea to record the indicators of chemical changes on the board as you review the background information with the class. Review the background information with students before completing the demonstration. ![]() Scientific Practices: Constructing ExplanationsĮssential Question : How can you distinguish between a physical and a chemical change? The mass of lead is a _: Chemical Reactions - The face that atoms are conserved, together with the knowledge of the chemical properties of the elements involved, can be used to describe and predict chemical reactions. True or False: Dicing potatoes is a physical change. True or False: Bread rising is a physical property. The formation of gas bubbles is a sign of what type of change?ħ. Which of the following are examples of matter?Ħ. Aluminum Phosphate has a density of 2.566 g/cm3ĥ. HCl being a strong acid is a _, Wood sawed in two is _Ĥ. The following questions are multiple choice.ġ. The atoms in compounds are rearranged to make new and different compounds. Different elements or compounds are present at the end of the chemical change. A CHEMICAL CHANGE alters the composition of the original matter. The elements and/or compounds at the start of the reaction are rearranged into new product compounds or elements. This is a chemical property.Ĭhemical change results in one or more substances of entirely different composition from the original substances. Zinc reacts with hydrochloric acid to produce hydrogen gas. Metals in general have they chemical property of reacting with an acid. For example hydrogen has the potential to ignite and explode given the right conditions. At this time this is very difficult to do and you are not expected to be able to do it. Eventually you should be able to look at the formula of a compound and state some chemical property. It is quite difficult to define a chemical property without using the word "change". What elements, electrons, and bonding are present to give the potential for chemical change. volume: How much space the sample takes upĬhemical properties of matter describes its "potential" to undergo some chemical change or reaction by virtue of its composition.malleability: if a substance can be flattenedĮxtensive Properties: A physical property that will change if the amount of matter changes.conductivity: electricity to flow through the substance.Intensive properties: A physical property that will be the same regardless of the amount of matter. The property is proportional to the amount of material in the system. In contrast, an extensive property is additive for independent, non-interacting subsystems. When a diamond is cut, the pieces maintain their intrinsic hardness (until their size reaches a few atoms thick). Examples of intensive properties include temperature, refractive index, density, and hardness of an object. This classification relates to the dependency of the properties upon the size or extent of the system or object in question.Īn intensive property is a bulk property, meaning that it is a physical property of a system that does not depend on the system size or the amount of material in the system. Physical properties of materials and systems are often described as intensive and extensive properties. Physical properties are used to observe and describe matter. Physical properties can be observed or measured without changing the composition of matter. ![]()
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