A) Subscripts in the reactants must be conserved in the products. B) Coefficients are used to balance the atoms on both sides. C) The law of conservation of matter must be followed. D) Phases are often shown for each compound but are not critical to balancing an equation. E) All of the above statements (a-d) are true.
This is because when an azeotrope is boiled, the resulting vapour has the same ratio of constituents as the original mixture of liquids. Each azeotrope has a characteristic boiling point. The boiling point of an azeotrope is either less than the boiling points of any of its constituents (a positive azeotrope), or greater than the boiling point of any of its constituents (a negative azeotrope). The azeotropes of cyclohexanol/water and cyclohexene/water are both positive azeotropes. The separation of cyclohexene could not depend on distillation alone.
Potential energy is the energy an object has because of its position in relatibn to other objects. Kinetic energy is energy associated with a moving object. (p. 27). 24. According to the First Law of Thermodynamics, energy cannot be created or destroyed.
* HCl and phenolphthalein * Both chemicals were clear, and stayed clear when they were mixed together. There were bubbles formed, which means a chemical change occurred. * NaOH and AgNO3 * When you mix these two, a milky grayish brown color is formed. It is cloudy, not clear. * AgNO3 and NH3 * These chemicals were both clear in their pipets.
Aqueous solutions (when the ionic compounds are dissolved in water)? Yes With both yes’s they both have ions that are free to move and conduct electricity. 1. Do covalent compounds conduct electricity as: (3 points) 1. Solids?
* In heterogeneous equilibria two or more phases are present. * Because the concentrations of pure solids and liquids are constant, these substances are left out of the equilibrium constant expression for a heterogeneous equilibrium. Section 4 * If the concentration of all species in an equilibrium are known, the equilibrium-constant expression can be used to calculate the value of the equilibrium constant. * The changes in the concentrations of reactants and products on the way to achieving equilibrium are governed by the stoichiometry of the reaction. Section 5 * The reaction quotient, Q, is found by substituting reactant and product partial pressures or concentrations into the equilibrium constant
F L D. F L P P 8805-6504 –7– 9. N05/4/PHYSI/SPM/ENG/TZ0/XX+ If the resultant external force acting on a particle is zero, the particle A. B. C. D. must have constant speed. must be at rest. must have constant velocity.
For purposes of this experiment, you may assume that the heat loss to the calorimeter and the surrounding air is negligible. Even if heat is lost to either of these, it is a fairly constant factor in each part of the experiment, and has little effect on the final results.
Liquid A and liquid B do not dissolve each other (they are immiscible). Describe what you expect to see when liquids are combined in a test tube. When two immiscible liquids are placed in a test tube, the liquid with the smaller density settles on top of the liquids with the greater density. In this situation Liquid A will sink to the bottom of the test tube and Liquid B will float on top. 3.
A) is neutralized by water B) is surrounded by water molecules C) reacts and forms a covalent bond to water D) aggregates with other molecules or ions to form a micelle in water Answer: B Page Ref: Section 3 11 9) Which would you expect to be most soluble in water? A) I B) II C) III D) IV Answer: A Page Ref: Section 3 10) Solutes diffuse more slowly in cytoplasm than in water because of A) the higher viscosity of water. B) the higher heat of vaporization of water. C) the presence of many crowded molecules in the cytoplasm. D) the absence of charged molecules inside cells.