Presentation on theme: "Bell Work 1/5 Ag Calcium K Argon Co Pb Iodine Cl Silver Ca Potassium Ar Cobalt Lead I Chlorine."— Presentation transcript:
Bell Work 1/5 Ag Calcium K Argon Co Pb Iodine Cl Silver Ca Potassium Ar Cobalt Lead I Chlorine
Element, Compound, Molecule and Mixtures Chambers Science
Elements A pure substance that cannot be broken down into a simpler substance by ordinary chemical means. Element = One or more of the same atoms NOT bonded together! Examples: Gold - Au, Silver - Ag, Oxygen - O, and Hydrogen - H
Compounds A pure substance made of two or more different elements chemically bonded together. All compounds are molecules! Examples: Water - H 2 O and Carbon dioxide - CO 2
Molecule A group of atoms (same or different) held together by a chemical bond NOT all molecules are compounds. Examples: Water - H 2 O, Oxygen - O 2, and Hydrogen - H 2 Molecules Molecules and compounds Draw this chart
Difference b/t Compound and Molecule A molecule is formed when two or more atoms join together chemically.atoms A compound is a molecule that contains at least two different elements.elements All compounds are molecules but not all molecules are compounds. Molecular hydrogen (H2), molecular oxygen (O2) and molecular nitrogen (N2) are not compounds because each is composed of a single element. Water (H2O), carbon dioxide (CO2) and methane (CH4) are compounds because each is made from more than one element.hydrogenoxygennitrogen
Mixture A combination of two or more substances that are not chemically bonded and are not in fixed proportion. Most natural substances are mixtures. Examples: tossed salad, oil & vinegar, and a bowl of cereal.
Types of Mixtures Homogenous mixture: A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. (you can’t separate the different parts) Example: kool aid Heterogeneous Mixture:A heterogeneous mixture consists of visibly different substances or phases. (you can pull out the different parts) Example: salads
Solutions Solution: is composed of particles of two or more substances that are evenly distributed among each other. Appears to be a single substance. Solute: What gets dissolved (salt) Solvent: What solute gets dissolved into (water) Suspension: a mixture in which particles are a material are more or less evenly dispersed throughout a liquid or a gas, but are large enough that they settle out. (snow globe) Colloid: a mixture in which the particles are dispersed throughout but are not heavy enough to settle out. (whip cream or jello)
Ways to separate mixtures Distillation: separates mixtures based on the boiling points of the components. Ex: Water distilled from salt Magnet: to separate metals Centrifuge: machine used to separate different parts of blood.