Friday, 10/28 Day 1 Fill out your Agenda. Science Starter: Science Warm Ups AR Book under desk Agenda 1. Please have these Items on your desk. Science notebook Fill out your Agenda. Science Starter: What is matter? What is a property?
Physical versus Chemical Properties
Reviewing MATTER Matter: anything that has mass and takes up space Mass – the amount of matter in something Volume – the amount of space something occupies Which of the following is matter? A car? A box? You?
What is a property? Property: a characteristic of a substance that can be observed
Matter can be changed two ways Physically Physical reaction Physical change Chemically Chemical reaction Chemical change
Physical Property Physical property: a property that can be observed without changing the identity of the substance. Examples: luster malleability: the ability to be hammered into a thin sheet ductility: the ability to be stretched into a wire melting point boiling point density solubility specific heat
Special Physical Properties Melting point: the temperature at which a substance changes from a solid to a liquid at a given pressure Boiling point: the temperature at which a substance changes from a liquid to a gas at a given pressure water = 100oC
Physical Changes Does NOT CHANGE THE TYPE OF MATTER Nothing new or different is formed Could be a change in: A. Size B. Change in state C. Color D. Shape
Examples of Physical Changes A. Boiling B. Freezing C. Dissolving D. Breaking E. Making a mixture 2 or more types of matter (substances) mixed together Not in specific amounts Can be separated physically
Chemical Properties Chemical property: a property that can only be observed by changing the identity of the substance Examples: flammability ability to rust reactivity with vinegar
Picture from www.chem4kids.com Chemical Changes The composition of the substance changes. The substances present at the beginning of the change are not present at the end; new substances are formed. The change cannot be “undone.” Picture from www.chem4kids.com
Evidence of Chemical Reactions Chemical Reaction: The process by which the atoms of one or more substances are rearranged to form different substances. Temperature change Color change Gas or solid appears
https://www.youtube.com/watch?v=X328AWaJXvI Bozeman video clip