By: Keisha Nagorr & Gloria Huang Matter Matters By: Keisha Nagorr & Gloria Huang

Chemical Change When a chemical change occurs it is irreversible. A chemical change is a change in matter that occurs when substances combine to form new substances. During a chemical change the atoms within a substance are rearranged into different combinations. Burning wood is an example of chemical change because the carbon in the wood reacts with oxygen in the air creating ash and smoke.

Changes of State When a chemical changes its state its appearance will change. Chemical changes involve substances reacting to form new substances. When a physical change occurs, there would be change in its appearance but no new substance would be formed. Water is a good example for changes of state because it can easily be changed back and forth between different states, it can be freezed to form a solid as well as be heated to form a gas.

Kinetic molecular theory The kinetic molecular theory (KMT) explains the energy associated with the change of state and the behavior of solid, liquid and gas particles. The main points of KMT are... - All matter is made of small particles - There is an empty space between particles -Particles are always in motion -Energy is what makes particles move, the more energy the particles have, the faster they can move and the further apart they can get. In a solid the particles are tightly packed together and vibrate in place. The particles in a liquid slip and slide past one another. The particles in a gas have a very large space between them.

The Particle model of matter - takes the shape of container - Has volume of container - Can be compressed Has definite shape Has fixed volume Cannot be compressed Takes the shape of container. Has fixed volume Cannot be compressed

Describing Matter What are qualitative properties? What are physical properties? Physical properties are characteristics of matter that can be observed or measured. What are qualitative properties? Qualitative properties are properties that can be described but not measured. Qualitative examples are: sight, smell, touch, taste and sound. The plant has waxy green leaves. QUALITATIVE What are quantitative properties? Quantitative properties are characteristics that can be measured numerically. Quantitative observations are made with instruments such as rulers, balances, graduated cylinders, beakers, and thermometers. The plant is 3 inches tall. QUANTITATIVE

Pure Substances What Are Pure Substance? An element is a pure substance that cannot be broken down or separated into simpler substances. Gold and oxygen are both elements. Many types of matter are pure substances, which means that they are made up of only one kind of particle. Pure Substance examples: Gold, water, and oxygen. A compound is a pure substance composed of at least two elements combined in a specific way. For example, water is a compound that is made up of the elements hydrogen and oxygen.

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