difference between physical changes and chemical changes

#Difference between physical changes and chemical changes cracked#
#Difference between physical changes and chemical changes code#

It also is used to make foundations and subfloors in many houses and buildings. What other uses of concrete do you know about and see all the time? Name some physical and chemical properties of concrete based on your examples.Ĭoncrete is used in bridges and to make sidewalks. The article mentions the Pantheon, an impressive Roman structure that is made of concrete. If a chemical change occurs, the physical and chemical properties will likely be different, because a new substance is created.ġ. If a physical change occurs to a substance, the resulting substance will have the exact same chemical and physical properties. If a physical change occurs to a substance, do its physical and chemical properties change? What if a chemical change occurs? Its chemical makeup stays the same whether it is solid, liquid or gas.Ħ. You can change the earring’s chemical properties by combining it with a reactive acid. However, no matter how much you mash the earring, it remains the same metal. A physical property of the metal earring is malleability. When you burn paper, it reacts with oxygen to create new substances, including ashes, water and carbon dioxide. A chemical characteristic of paper is that it is flammable. Describe some of the chemical and physical properties of at least three of the substances in the examples listed in question 1.Ī physical characteristic of paper is that it is flexible, so it can be crumbled and bent, and yet it remains paper. Chemical properties of a substance describe how it can react with other substances. Physical properties of a substance can be observed without changing the chemical makeup of the substance, such as density. Every substance has physical and chemical properties. Sometimes chemical changes occur, and the products don’t appear to be different from the reactants.ĥ. You cann o t always s ee whether a change in matter has occurred.

Can observation always tell you whether a change in matter has occurred? Discuss why or why not. Some common indicators of chemical changes include the production or consumption of heat or energy, changes in color and composition, the combustion of a substance and the formation of new solids or gases.Ĥ. Phase changes - for example, when a solid becomes a liquid or a liquid becomes a gas - also indicate a physical change. Physical changes can be indicated by changes in a substance’s texture, shape, temperature or amount. Using the examples given, discuss what indicators you can use to determine whether a physical or chemical change has taken place. Chemical changes alter the chemical makeup of a substance, creating new substances when chemical bonds are broken and new chemical bonds form.ģ. Also, these changes are often reversible. The same substance is present before and after the physical change. Physical changes do not change the chemical composition of a substance. What happens to matter when it goes through a physical change? What about a chemical change? Using your answers, write your own definition of physical change and chemical change. The objects listed in the first example are going through physical changes, and the objects in the second set are going through chemical changes.Ģ. Look at the examples given below and discuss which group of examples you think show physical changes and which show chemical changes.Ĭrumbling paper, dissolving sugar, melting ice, bending a metal earring and diluting orange juice with waterĪ piece of paper burning, a car door rusting, food digesting, a banana ripening and a leaf photosynthesizing When matter goes through a change, the process is either classified as chemical or physical.

#Difference between physical changes and chemical changes code#

A version of the article, “Chemists Crack the Code to Ancient Roman Concrete,” appears in the Februissue of Science News.ġ.

#Difference between physical changes and chemical changes cracked#

Have students discuss the first set of questions with a partner, then read the Science News article “ These chemists cracked the code to long-lasting Roman concrete” and answer the second set of questions. Before beginning this work, students should understand that substances are made up of atoms, elements and molecules. This discussion activity can be used to help students better understand the difference between physical and chemical changes.