Revisiting Our Phenomenon

Unravel the mysteries of matter! This worksheet helps 7th graders master the classification of matter, atomic structure, and periodic trends.

Phenomenon - Macaroni Salad and Gasolone Are Made of the Same Stuff? Let's revisit our phenomenon of macaroni salad and gasoline! Label the atom below! Proton Electron Shell Neutron Nucleus In the previous question you labeled an atom that is apart of macaroni salad and gasoline. Fill in the following paragraph with the correct terms to complete the paragraph. Be sure to use the periodic table and other things in your notebook to help you out. The oxygen atom from the previous question had six valence electrons, which are the number of electrons in the outer shell of an atom. Valence electrons are used in bonding and have a negative charge. Protons have a positive charge and are found in the nucleus with neutrons that do not have a charge. Electrons are the smallest subatomic particles and they barely have any mass. Most of the mass of an atom is in the nucleus.The atom labeled above is apart of one of the molecules in the macaroni salad and gasoline so it is one of the atoms that bonded with other atoms. This atom modeled above has 6 valence electrons. Full outer shells have eight electrons. SInce this atom already has 6 electrons in its outer shell it wants to hold on to them, which is called having a high electronegativity. Since that is true the atomic radius is going to be smaller since the atom want to hold on tight to its valence electrons. Which answer correctly labels the arrows that represent the trends on the periodic table of electronegativity and atomic radius? A: decreasing electronegativityB: decreasing atomic radius A: increasing electronegativityB: increasing atomic radius A: increasing electronegativityB: decreasing atomic radius A: decreasing electronegativityB: increasing atomic radius Types of Molecules Distinguish between the types of molecules found in both macaroni salad and gasoline. Elemental Molecule Diatomic Molecule Compound Molecule 2 or more of the same type of atom bonded together 2 of the same types of atoms bonded together 2 or more different types of atoms bonded together Formed by a covalent bond Formed by a covalent bond Can be formed by covalent or ionic bonds S8 Ar2 CO2 The glucose molecules found in macaroni salad are made by covalent bonds where atoms share electrons. Which of the following questions would help you classify gasoline as a mixture or a pure substances? Can it be physically separated? Is it uniform throughout? Fill in the graphic organizer with the appropriate words. Type or copy exactly like the word bank. Matter Homogeneous Mixture Mixture Substance Element Compound Heterogeneous mixture Matter Substance Mixture Homogeneous Mixture Heterogeneous Mixture Element Compound Sort the following samples of matter according to its classification (element, compound, homogeneous mixture, heterogeneous mixture). Elements silver oxygen hydrogen carbon Compounds water carbon dioxide sodium chloride glucose Homogeneous mixture clean air salt water coffee (drink) Heterogeneous Mixture dirty water dirty air trail mix macaroni salad Students are trying to classify macaroni salad as a mixture, list 4 ways to separate a mixure.