Atoms, Elements, Compounds, Mixtures and Chemical Reactions

Master atoms, elements, compounds, and mixtures! Learn definitions and classify matter with this science worksheet.

Fill in the missing words in the definitions below. - An element consists of one type(s) of atom.- A compound contains two or more elements joined together, that are chemically bonded.- A mixture contains two or more elements or compounds, but they are not chemically bonded.- In the middle of an atom is a dense nucleus- An atom is the most basic building block of all matter.- Electronsare found in electron shellsand have a negativecharge.- Protonshave a positivecharge and are found in the nucleus.- Neutral sub-atomic particles, called neutrons, are also found in the nucleus. Sort the following items into their correct categories. Element Argon (Ar) Helium (He) Compound Water (H2O) potassium chloride (KCl) Mixture Salad Dressing Blood Draw a model of an ELEMENT below. Draw a model of a COMPOUND below. Draw a model of a MIXTURE below. Label the reactant and product for this chemical reaction. reactants product product List two observations that can occur to tell us when a chemical reaction has taken place Sort the following reactions as either exothermic or endothermic Exothermic A candle flame Making ice cubes Burning sugar energy released Endothermic An instant cold pack Cooking an egg Melting Ice cubes energy absorbed