AIM: How can we identify the chemical & physical properties of matter? (PSKI#3) 5/10/13 DO NOW: 1. Pick up today’s quiz & finish it HOMEWORK: 1. Read p. 81-85 in the PS ILS REVIEW BOOK. 2. Answer Questions #1-43 on p. 87-95 on your scantron 3. ILS #2 Test Corrections & get it signed DUE- Monday by 8 AM Describe the shape & volume of solid, liquid, & gas. Solid – definite shape, definite volume Liquid – no definite shape, definite volume Gas – no definite shape, no definite volume Compare how the particles are packed in a solid, liquid, & gas. Solid – tight Liquid – farther apart Gas – loosely packed Describe the particle movement in solid, liquid, & gas. Solid – shaking in place Liquid – moving a little faster Gas – fast moving Describe the phase change melting. Solid to liquid Heat absorbed (gained) Particle move farther apart Describe the phase change freezing. Liquid to solid Heat released (removed) Particles move slower Describe the phase change evaporation. Liquid to gas Heat absorbed (added) Particles move faster Describe the phase change condensation Gas to liquid Heat released (removed) Particles move slower What is Solubility? How well a substance can dissolve. What is a solute? The substance being dissolved What is a solvent? The substance doing the dissolving Identify the solute & solvent in the following solutions: Salt water – Salt (solute) Water (Solvent) Kool-aid Drink – Kool-aid Mix (solute) Water (solvent) How does temperature affect solubility? The higher the temperature of the solvent, the more soluble the solute How does surface area affect solubility? The greater the surface area of the solute, the faster the solute will dissolve. How can you increase the surface area of a substance (sugar cube)? Break is up into smaller pieces Crush it How does stirring affect solubility? When a solution is stirred, the solute dissolves faster 70g 20o 45o 70o Define weight. Weight is a measure of the pull of gravity on an object How does the amount of gravity affect weight? The greater the gravitational force acting on an object, the greater its weight. Why do we have less weight on the moon? We have less weight on the moon because there is less gravity on the moon than on earth. What is buoyancy? The upward force of a fluid Identify the physical properties of matter. Color, phase of matter, density, conductivity, boiling point, odor, mass, solubility, hardness, freezing point Identify the chemical properties of matter. Flammable Reactivity ILS Questions Which property of a substance indicates whether the substance is a liquid or a solid at room temperature? (1) melting point (2) electrical conductivity (3) flexibility (4) solubility Under which conditions would a sugar cube dissolve most quickly when placed in a liter of water at room temperature? (1) A whole sugar cube is added and the water is stirred. (2) A whole sugar cube is added and the water is not stirred. (3) A crushed sugar cube is added and the water is stirred. (4) A crushed sugar cube is added and the water is not stirred. ILS Question All of the liquid from a test tube is poured into a beaker, as shown in the diagram below. Compared to the liquid that was in the test tube, the liquid in the beaker has (1) a different volume, but the same shape (2) a different volume and a different shape (3) the same volume, but a different shape (4) the same volume and the same shape Diagrams A and B show models of how the molecules of the same substance are arranged in two different phases of matter. Which phases of matter are represented by diagrams A and B? ILS Question The data table below shows that as the pressure of a gas sample was changed, the volume of the gas changed. The pressure was measured in atmospheres (atm) and the volume was measured in milliliters (mL). According to the data table, as the pressure of the gas increases, the volume of the gas (1) decreases (2) increases (3) remains the same ILS QUESTIONS The diagram represents four processes, labeled A, B, C, and D, that occur when water changes phase. Which process is represented by B? (1) condensing (3) freezing (2) evaporating (4) melting Which two processes increase the motion of the molecules? (1) A and B (3) C and D (2) B and C (4) D and A ILS Question The graph shows the solubility curves for a solid solute and a gaseous solute. How many grams of the solid solute will dissolve in 100 grams of water at 25°C? Describe the relationship between water temperature and the solubility of the gaseous solute from 0°C to 15°C. State one way to increase the rate at which a solid solute dissolves in 100 grams of water.