Classify the statements pertaining to elements and compounds as either true or false. True False Compounds must contain atHeast [wo elements. Compounds are pure substances whereas elements are mixtures. : Compounds cannot be broken down further by processes such as filtration. Compounds may be broken down into simpfer substances througli: chemical processes. A compound is a physical mixture of simpler substances.

Select which is appropriate in completely classifying gaseous oxygen O2. Homogeneous mixture Pure substance Mixture Compound Element Heterogeneous Mixture

Match the term on the left box with the most appropriate definition on the right. 1 Empirical Formula A A compound with a specific number of water molecules bonded to each formula unit. 2 Mass Percent B This shows only the relative amounts of the elements, not the actual amounts. Atoms of an element are chemically similar but Chave different numbers of neutrons and, thus, different mass numbers. This represents an element in a compound is the D mass of the element expressed as a percentage of the total mass of the compound. E The study of mass-mole-number relationships in chemical reactions and formulas. F The reactant that runs out first following a chemical reaction. G The amount of substance contains as many elementary entities as exactly 12g of carbon-12. The law states that the elements in a chemical H compound are always present in the same proportions by mass. A compound that does not have any water I molecules bonded to it; applies to compounds that can be hydrated. J This…

Ular) react together to produce new The first step in writing balanced chemical reactions is identifying the substances in the reaction and labeling them as elements, molecular compounds or ionic compounds. Based on the type of substance it is, you then write the correct formula from the given name. Element: a single type of atom or a diatomic element. Recognized in the description as a single element name by itself. Elements are always neutral (they have no charge). Check if a diatomic element. Molecular compound: made of two nonmetal atoms. Greek prefixes in the name indicate the number of each type of atom in the formula. lonic compound: made of a cation and anion. Recognized because they start with a metal or ammonium. Need the charges of the ions to determine the formula of the neutral compound. For each chemical name below label it as an element (E), molecular (M), or ionic (I) and then write the correct formula for the substance on the line next to it. 1. Aluminum reacts with…