Chemical Changes • When a spoon tarnishes is it a chemical change? • Yes • When water melts is it a chemical changes? • No • When fireworks explode is it a chemical change? • Yes • When you mix two substances and there is bubbling and a white substance formed, is it a chemical change? • Yes
What is the difference… • Between a PHYSCIAL and CHEMICAL change? Tell me the difference and give an example.
Elements vs. Compounds Found in nature Only 1 Made of 2 or more Found on the periodic table O CO H2O Compounds Elements
Is it a Compound or Element? • Na • Element • F • Element • HOH • Compound • Ar • Element • NaCl • Compound
Metals, Nonmetals, and Metalloids • 1) Metals • 2) Nonmetals • 3) Metalloids • 4) O • 5) Fe • 6) As • 7) Ag • A)Example of Metalloid • B) Conducts electricty and is magnetic • C) Is a semiconductor • D) Example of metal • E) Example of nonmetal • F) Has a low melting and boiling point • G) Is the element silver and a good conductor of electricity
How do I find the density? D= M/V • I have a box with a length of 2 meter, a height of 2 meters, and a width of 1 meter. • I know the mass of the box is 288 grams. • What is the density of the box? • 72 l/g • Tell me the steps it took to get to the density.
What is the density? • I have a piece of material that is 3 meters wide, 6 meters long, and 4 meters tall. • The object has a mass of 80 kilograms. • What is the density of the piece of material.
Lab Equipment • What piece of lab equipment would you use when measuring the force of an object? • What do you use when finding out how much time has elapsed during a part of an experiment? • I want to find the mass of an object. Should I use a beaker or triple beam balance? • When measuring a small amount of liquid what should I use? • When measuring a large amount of liquid what should I use?
Safety Equipment • Where is the eye wash station? Is this emergency or preventative safety equipment? • When you are handling a hot beaker, what safety equipment should you wear? • What is an example of a preventative safety equipment? • What is an example of a emergency safety equipment?
The Atom (1) Proton (A) Both are in the nucleus (B) Equals the atomic number (2) Neutron (C) Has a positive charge (D) Travels outside the nucleus (E) Has no charge (3) Electron (F) Has a negative charge (G) Equals the mass number • What are the three parts of an atom?
Analogies • Positive: Protons :: Negative: _____________ • Electrons • Leaves turning : Chemical change ::__________ : Physical Change color • There is more than 1 right answer…as long as it’s a physical change you are right!
What do you think are the most abundant elements in the human body? • Oxygen 65% • Carbon 18% • Hydrogen 10% • Nitrogen 3%
States of Matter • Which picture correlates with a SOLID, LIQUID, GAS, and PLASMA? 1. 2. 3. 4. What is the state of Gold? What is the state of Hydrogen? What is the state of Cl?
What’s the answer to the question? • A student was given a liquid and solid that produced a gas when mixed together. • Use the table below to find out how much liquid and solid she would need to make 6.3 grams of gas.