A.5 Particulate View of Matter

What is the particulate level?

What is matter is made of?

Which is an element and which isn’t? Atoms Atom: is the basic unit of any element. Atoms have space and mass and make up all forms of matter. Element: is matter made up of only one kind of atom: Which is an element and which isn’t? A B C D

How many kinds of elements OR types of atoms are there? How do you know?

How can we talk about matter?

Matter can be discussed in different contexts: 1) State of matter : gas, liquid, solid, plasma 2) Chemical form of matter: element, mixture, or compound 3) Chemical structure of matter: atoms, molecules, etc.

Use of the word “substance” in chemistry implies that it is “pure” (Pure) substance: any sample of matter (solid, liquid, or gas) that has a definite and constant composition AND distinct chemical properties (behavior). Examples: diamond, water, table salt, baking soda

Molecule: collection of atoms chemically bonded together, and that move and act together Compound: a molecule made of 2 or more different types of atoms (30 million identified!) Chemical substances can therefore be either a pure chemical element or a pure chemical compound.

Place the correct word by each letter: atom, compound, element or molecule (more than one label may apply) A. B. C. D. How many types atoms are in each substance?

Chemical Bonds Atoms are held together by chemical bonds Salt sulfuric acid

Warm Up: Apply as many of the following terms to each diagram: Terms: element, compound, molecule, atom(s)

A.6 Symbols, Formulas and Equations Element names are abbreviated as letters Chemical compounds/formulas are the words of chemistry Chemical equations are the sentences of chemistry 2H2 + O2 -> 2H2O Hydrogen + oxygen  water

What do coefficients and subscripts tell you?

How many atoms total do the following formulas represent? Examples: H2 2H2 H2O2 2H2O2 What elements are in each substance? What is the difference between A and B? Draw a model to show the difference.

Homework: Look up a minimum of 5 substances that you commonly have in your house. For each substance: 1) Look up and write the chemical formula. 2) Draw a model for its chemical formula. 3) List the names of all the elements that make up that substance. 4) List how many atoms of each element are in that substance. Good site: http://www.ivyroses.com/Chemistry/GCSE/Common-Chemicals-in-the-Home_Molecular-Formulae.php

Homework: Flash cards OR Vocab Sheet OR Concept Map – DUE MONDAY Matter Density Atom Element Substance Molecule Compound Reactants Products Coefficient Subscript