high melting point, hard, brittle, slightly soluble in water, conductor of electricity when melted or in solution Molecular solid - crystalline solid that has molecules arranged in a particular configuration. low melting point, generally insoluble in water, nonconductor of electricity. Metallic solid - crystalline solid that has atoms of metals arranged in a definite pattern. low to high melting point, malleable, ductile, conductor of electricity, insoluble in most solvents. Lesson 13.6 Changes of physical state: * necessary to draw a temperature-energy graph to see the change in temperature with a constant application of heat Heat of fusion - the amount of heat required to melt 1.00 g of substance.
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.
05.08 Colligative Properties The purpose of this presentation is to demonstrate a real world application of colligative properties. Colligative properties are properties of solutions that are determined from the concentration of solute particles in a solution, and not by the identity (mass) of the particles in the solute. Colligative properties include freezing point depression, boiling point elevation, vapor pressure lowering, and osmotic pressure. When the temperature of a liquid is below its boiling point (evaporation), only the molecules around the surface of the liquid can escape into gas particles. Once a solute is added to the solvent, solute molecules occupy the molecular surface space of the liquid, swing the evaporation process.
The pyruvate is garter oxidized to yield more ATP What happens to the pyruvate under anaerobic conditions? The pyruvate is converted into lactic acid Diffusion After viewing the animation, answer these questions. Molecules dissolved in a solution are in constant random motion due to their kinetic energy . One result of this motion is that dissolved molecules become evenly distributed throughout the solution . This tendency of molecules to spread out is an example of __diffusion .
Explain your answer. The freezing of mercury is a reversible physical change because the change can be reversed by melting the frozen mercury so it is liquid again. Practice Problem #10 on page 46 10. Air is mainly a mixture of nitrogen and oxygen, with small amounts of other gases such as argon and carbon dioxide. What property could you use to separate the gases in the air?
A1. a Chemical equilibrium is ‘dynamic’ because both forward and reverse reactions occur at the same rate. An equilibrium develops between water vapour and water when wet clothes are in a sealed bag, with water evaporating as rapidly as water vapour condenses, so the clothes remain wet. b When the bag is opened, water vapour escapes and the rate of evaporation exceeds the rate of condensation. The system is not in equilibrium and the clothes dry.
The increase in the temperature will affect the rate of dissolving by speeding up the process. The solvents are able to move faster in higher temperatures which results to a fast process of dissolving. How does stirring affect, how fast sugar dissolves in water? When a sugar cube is solid, all the particles are tightly packed together. As it begins to dissolve, the particles begin to move apart.
Introduction When a substance is in the gas state, its molecules are very spread out and are in constant motion. They are in constant collision with the walls of their container. The speed of the molecules in a gas depends on the environment around it. Environmental conditions around the molecules, such as temperature affect the speed. For example, if the temperature increases, then the speed of the molecules increases.
Unlike Sol's inner or Terrestrial planets, which are relatively rocky with thin atmospheres – the outer planets or Jovian planets are the opposite. These planets tend to be cold with dense, thick atmospheres and small rocky cores. Jovian planets are also much larger than Terrestrial bodies. The Jovian planets generally are composed of lighter elements and compounds of the same. These normally include Hydrogen and Helium with some compounds such as Ammonia and some Water.
The Speed of Sound: | Sound travels at different speeds depending on what it is traveling through. Of the three mediums (gas, liquid, and solid) sound waves travel the slowest through gases, faster through liquids, and fastest through solids. Temperature also affects the speed of sound.Gases:The speed of sound depends upon the properties of the medium it is passing through. When we look at the properties of a gas, we see that only when molecules collide with each other can the condensations and rarefactions of a sound wave move about. So, it makes sense that the speed of sound has the same order of magnitude as the average molecular speed between collisions.