Today is Thursday 3/21 Learning Target: I can explain the properties of matter and how they change. Homework: Study Guide Day 3 Sample Questions (answer on your study guide AND on google classroom) You will need: Pencil Day 3 Study Guide Day 3 Notes

Physical Properties: characteristics that can be observed _______________ changing the identity of the substance. State of matter _________ : atoms are tightly and uniformly packed together _________ ; atoms are not as tightly packed together and move faster _________ ; atoms are spread out and move very quickly without solid liquid gas

Density: a measure of ____________ over ____________ Density: a measure of ____________ over ____________. Aka: how __________ packed molecules are. The more dense something is the more ___________ the molecules are. More dense = sinks, less dense = floats Boiling Point: The temperature at which a _____________ turns into a ____________. Melting Point: The temperature at which a ____________ becomes a ____________. Solubility: How easily something _________________. Some things are _____________ and cannot dissolve (sand, flour, etc.) mass volume packed liquid gas solid liquid dissolves insoluble

Chemical Properties: characteristics that describe a substance’s ability to ____________ and can only be observed by changing the ________________ of the substance. Reactivity: how likely a substance is to react with another substance. pH: how __________ something is. pH scale: a scale from 0-14 that tells how acidic something is. 7 is neutral (water), anything less than 7 is an __________________ and anything greater than 7 is a _____________. To make something more acidic (decrease the pH) you add an acid. To increase the pH (make it more basic) you add a base. Oxidation: if a substance reacts with ____________. Ex: rust change identity acidic acid base oxygen

Signs/Evidence of a Chemical Reaction: A new substance is ALWAYS formed (because the __________ of the substance changes. Precipitate forms (____________ forms) Gas forms (substance bubbles like baking soda and ___________) Color change: ex- when something ___________ or rusts, it turns orange/brown Heat change: ___________= substance gets colder, ____________= substance gets hotter. identity solid vinegar oxidizes endothermic exothermic

Elements, Compounds, Mixtures Element: on the periodic table, made of only one kind of __________. Not combined with anything else. Compound: 2 or more elements ________________ combined. Mixture: 2 or more substances ________________ combined. Homogeneous mixture: uniformly combined/mixed Ex: __________________ Heterogeneous mixture: NOT uniformly combined/mixed atom chemically physically coffee Trail mix

Periodic Table Organization _____________: vertical columns on the periodic table. Elements in the same ________ have similar characteristics. _____________: horizontal rows on the periodic table. groups group periods Atomic # =# of protons Atomic mass = # of protons + # of neutrons # of protons = # of electrons

Homework: Complete Sample Questions on Study Guide and put your answers on the google form!!! You can submit multiple times so after you submit it go back and check your work and make corrections!!!