surrounds a cell. It is a semipermeable membrane‚ which means that some particles pass through the membrane easily while others cannot. The Osmosis Gizmo™ portrays a cell (red square) in a solution of purple solute particles dissolved in green solvent particles. Press Play ([pic]) and observe. 1. Which particles can pass through the cell membrane? ___________________________________________ 2. Which particles cannot pass through the cell membrane? ___________________________
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which the particles in a solid leave its surface? A strong odour in one of any of these soilds would simply mean that the molecules leave the surface easily. 10. From your answer to question 1‚ which of the two types of solids seem to have the stronger forces of attraction? Explain your answer. Camphor has a very strong odor which makes it easy for the particles in the soild leave it’s surface. The particle attraction to the soild is not very strong which means that the particles would leave
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emitted alpha particles which we now know to be helium nuclei‚ a gold foil which was 0.00004cm thick and a detector which was a zinc sulphide screen that detected that alpha particles once it passed the gold foil. Alpha particles were used because they were positively charged‚ extremely dense and travelled at a high speed. To count the particles Geiger and Marsden would sit in the dark for thirty minutes to an hour so their eyes would adjust. Then they would count the alpha particles that were hitting
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1 Long-term and medium-term fluctuations 5.2 The long term: Schumpeter’s theory on cyclical growth Questions and exercises 5.3 The medium-term business cycle: the Multiplier-Accelerator model Questions and exercises 5.4 Capital and the business cycle 5.5 Investments Questions and exercises 5.6 Multiplier-Accelerator-Capital (M-A-C) Model Questions and exercises 5.7 Cyclical unemployment Questions and exercises Appendix 5.1
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at the molecular level by how the particles are held together - The phase of matter is considered a physical property because a change in a substance’s phase does not change the chemical properties or identity of the substance. - The phases of matter are determined by the kinetic energy of the particles and the attractive forces between the particles. - Attractions between particles‚ called intermolecular forces. - The effects of the motion of the particles on these attractions determines the
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colloidal in nature. Milk‚ butter‚ whipped cream‚ fruit jellies‚ ice cream‚ bread etc. are all colloidal in nature. For example‚ milk is an emulsion of butter fat in water‚ stabilized by milk protein (casein). Ice cream is a dispersion of colloidal ice particles in cream. Similarly‚ bread consists of air dispersed in baked dough. Colloidal medicines are more effective and are easily absorbed by the body system. Therefore a large number of pharmaceutical preparations are emulsions. Halibut-liver oil‚
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as radiation of alpha α and beta β particles and gamma γ rays in terms of: (6) Ionising power Penetrating power Effect of magnetic field Effect of electric Field Alpha Particles: Alpha particles are composed of two protons and two neutrons and have the same nucleus as Helium. It is a very stable particle. Large nuclei such as Americium-241 emit alpha particles. As it emits alpha particles its mass and atomic number decrease
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movement of gas particles was a crucial component of this experiment. After the can was placed onto the hot plate‚ as the water heated up‚ the gas particles inside of the can started to move faster due to the relationship between temperature and the average kinetic energy‚ or average motion energy‚ of the gas particles. As the temperature increased‚ so did the speed of the particles inside of the can. Particles of water obtained sufficient energy to turn into water vapor‚ and the particles of water vapor
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C D 28 28 60 60 number of neutrons 32 60 28 32 number of orbital electrons 28 28 28 32 2 A nucleus of bohrium x Bh decays to mendelevium y emissions. bohrium x Bh → dubnium + α y → lawrencium + α 255 Md 101 by a sequence of three α-particle → mendelevium 255 Md + α 101 How many neutrons are there in a nucleus of x Bh? y A B C D 267 261 160 154 3 Which set of radioactive emissions corresponds to the descriptions given in the table headings? high-speed electrons A B C D α α
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solid‚ in phase C-D Tert-Butyl Alcohol stays a liquid‚ and in phase E-F the chemical stays a gas. This is observed at the particle level because temperature is a measure of Ek; the temperature is increasing which increases kinetic energy. Since Ek is the energy of motion‚ the particles would increase their velocity and the number and force of collisions. However‚ the particles would not increase their spacing since the phase potential energy remains constant during each of these three phases. The
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