physical and chemical properties and changes

Properties of matter fall into one of two categories.

(credit b: modification of work by Jeff Turner credit c: modification of work by Gloria Cabada-Leman credit d: modification of work by Roberto Verzo) (d) A banana turning brown is a chemical change as new, darker (and less tasty) substances form. (c) Cooking red meat causes a number of chemical changes, including the oxidation of iron in myoglobin that results in the familiar red-to-brown color change.

(b) During the combustion of a match, cellulose in the match and oxygen from the air undergo a chemical change to form carbon dioxide and water vapor. (a) Copper and nitric acid undergo a chemical change to form copper nitrate and brown, gaseous nitrogen dioxide. In each of these examples, there is a change in the physical state, form, or properties of the substance, but no change in its chemical composition.įigure 3. Other examples of physical changes include magnetizing and demagnetizing metals (as is done with common antitheft security tags) and grinding solids into powders (which can sometimes yield noticeable changes in color). We observe a physical change when wax melts, when sugar dissolves in coffee, and when steam condenses into liquid water (Figure 1). A physical change is a change in the state or properties of matter without any accompanying change in its chemical composition (the identities of the substances contained in the matter). Other physical properties, such as the melting temperature of iron or the freezing temperature of water, can only be observed as matter undergoes a physical change. We can observe some physical properties, such as density and color, without changing the physical state of the matter observed. Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity. A physical property is a characteristic of matter that is not associated with a change in its chemical composition. The characteristics that enable us to distinguish one substance from another are called properties.

Identify properties of matter as extensive or intensive.

Identify properties of and changes in matter as physical or chemical.

This handbook will be of utmost importance as you attempt to solve your first case with your field partner.By the end of this section, you will be able to:

By the time you are ready to graduate from the Forensics Academy, you will have a complete Rookie Handbook of information. Next, your coursework will include chemistry lessons that will give you the tools to analyze collected evidence such as lipstick and blood. You will then be ready to complete the first project with a focus on the collection and analysis of crime scene evidence. Your preparation starts with an introduction to the nervous system and sensory processes. Through this unit, you will move through levels of training and earn badges as you prove your skills. 'Have you ever watched a crime show and said to yourself, 'I should be an investigator I could totally solve that!'? Now is your chance to show off your crime-solving skills.Ĭongratulations! Your class has been accepted into the Forensic Academy! In this unit, students will be sent through a fictitious Forensics Academy to learn chemistry principles and evidence-gathering skills they need to solve a non-violent crime. This is an NGSS unit that integrates a storyline and projects with existing Kesler Science inquiry labs, station labs, and 5E Lessons.

Physical and chemical properties and changes