Chemistry is the study of matter and the changes it undergoes. Mixtures consist of two or more substances that retain their properties when mixed, while compounds form new substances through chemical bonding. There are different types of chemical bonds including ionic bonds formed by electron transfer between atoms and covalent bonds formed by electron sharing between atoms to achieve stable electron configurations.

2. Chemistry is the study of composition, structure, and properties of matter, as well as the changes which matter under-goes. Mixture: consist of two or more substances that retain their chemical and physical properties when mixed together

3. Mixtures: The substances are not chemically mixed or changed chemically Salt and pepper will mix but never chemically join Compounds: A new substance formed from the chemical union of two or more elements.

4. Chemical Bonding: Atoms want to achieve stability Valence electrons: electrons in an atom’s last unfilled electron shell When an atom achieves 8 electrons in outer most shell it is considered stable Different atoms have different numbers of valence electrons

5. Chemical Bonding: Ion- charged particle results from the loss or gain of electrons Ionic Bond- a chemical bond in which electrons are completely transferred from one atom to another Positive and Negative bonding NaCl= sodium chloride

6. Chemical Bonding: Covalent Bond: Atoms share electrons in order to in order to complete their outer shells Share electrons H 2 O= covalent bonding

7. Chemical Reaction: This is the representation of a chemical reaction in terms of chemical symbols Baking a cake- has chemical reactions Chemical Breakdown: Substances can also decompose or break apart Electrolysis is a way to chemically spilt