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Questions in chemistry
📝 Answered - The coefficients in a balanced chemical equation represent: 1. the mass ratios of the substances in the reaction 2. the mole ratios of the substances in the reaction 3. the total number of electrons in the reaction 4. the total number of elements in the reaction
📝 Answered - Compared to the physical and chemical properties of the compound NO2, the compound N2O has 1. different physical properties and different chemical properties 2. different physical properties and the same chemical properties 3. the same physical properties and different chemical properties 4. the same physical properties and the same chemical properties
📝 Answered - Given the balanced equation representing a reaction: \[ \text{O}_2 \rightarrow \text{O} + \text{O} \] What occurs during this reaction? 1. Energy is absorbed as bonds are broken. 2. Energy is absorbed as bonds are formed. 3. Energy is released as bonds are broken. 4. Energy is released as bonds are formed.
📝 Answered - A sample of a substance has these characteristics: - Melting point of 981 K - Hard, brittle solid at room temperature - Poor conductor of heat and electricity as a solid - Good conductor of electricity as a liquid or in an aqueous solution This sample is classified as: 1. a metallic element 2. a radioactive element 3. a molecular compound 4. an ionic compound
📝 Answered - A 1-gram sample of a compound is added to 100 grams of [tex]H_2O(l)[/tex], and the resulting mixture is then thoroughly stirred. Some of the compound is then separated from the mixture by filtration. Based on Table F, the compound could be: 1. AgCl 2. CaCl₂ 3. NaCl 4. NiCl₂
📝 Answered - Which statement describes a reversible reaction at equilibrium? 1. The activation energy of the forward reaction must equal the activation energy of the reverse reaction. 2. The rate of the forward reaction must equal the rate of the reverse reaction. 3. The concentration of the reactants must equal the concentration of the products. 4. The potential energy of the reactants must equal the potential energy of the products.
📝 Answered - Which change results in the formation of different substances? A. burning of propane B. melting of NaCl (s) C. deposition of CO2(g) D. solidification of water
📝 Answered - What type of formula represents the simplest whole number ratio of atoms of the elements in a compound? 1. Molecular formula 2. Condensed formula 3. Empirical formula 4. Structural formula
📝 Answered - Which quantity can be calculated for a solid compound, given only the formula of the compound and the Periodic Table of the Elements? 1. The density of the compound 2. The heat of fusion of the compound 3. The melting point of each element in the compound 4. The percent composition by mass of each element in the compound
📝 Answered - When an excited electron in an atom moves to the ground state, the electron: 1. absorbs energy as it moves to a higher energy state 2. absorbs energy as it moves to a lower energy state 3. emits energy as it moves to a higher energy state 4. emits energy as it moves to a lower energy state
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