This document discusses the classification of matter. It defines pure substances as elements and compounds, which are uniform throughout and retain their properties. Mixtures are combinations of substances that are not chemically bonded and can be separated. Elements can be classified as metals, nonmetals or metalloids. Compounds are classified as organic or inorganic, acidic or basic. Mixtures are either homogeneous, with uniform composition, or heterogeneous, without uniform composition.
This document provides information about waves and sound waves. It defines different types of waves including longitudinal waves, transverse waves, and standing waves. It explains how the speed of a wave is calculated and provides examples of calculating wavelength and frequency. It also describes the differences between closed and open pipes and how harmonics work for each, with closed pipes producing sound at odd harmonics and open pipes at all harmonics.
Motion refers to an object changing position over time relative to a reference point. Speed is the distance an object travels divided by the time taken and is measured in meters per second or kilometers per hour. Average speed is the total distance divided by the total time. Velocity also includes direction of motion. Acceleration is the rate at which velocity changes. A force is a push or pull measured in newtons, but a force being applied does not necessarily mean motion will occur. The net force is the combination of all acting forces on an object. Gravity is the force of attraction between objects due to their mass. Weight is a measure of the gravitational force on an object that depends on its mass and location.
Chem 2 - Intermolecular Forces & Phases of Matter I Lumen Learning
This document discusses the phases of matter (gas, liquid, solid) and how intermolecular forces affect a substance's physical state. It introduces the central question of why a substance is in a particular phase at a given temperature. The key points are that a substance's phase depends on a balance between particle kinetic energies and interparticle attractive forces, and that decreasing temperature or increasing pressure can change a substance's phase by altering this balance. Different types of intermolecular forces are then ranked by their relative strengths in influencing boiling points, melting points, and vapor pressure.
This document provides an overview and comparison of various in-vitro methods used to measure antioxidant activity, including their advantages and disadvantages. It summarizes several common methods such as the Thin Layer Chromatography autography technique, Cellular Antioxidant Activity assay, Dye-Substrate oxidation method, and Cupric Ion Reducing Antioxidant Capacity method. The document emphasizes selecting methods based on feasibility, simplicity, required instrumentation and ability to effectively analyze antioxidant properties.
1. Sound is a longitudinal mechanical wave that propagates through a medium such as air or water by compressions and rarefactions which create regions of high and low pressure.
2. The document discusses several properties of sound waves including that frequency determines pitch, amplitude determines loudness, and speed depends on the properties of the medium.
3. Wave interference and phenomena like resonance, standing waves, and the Doppler effect are also covered as they relate to the nature and perception of sound waves.
This document discusses pure substances and mixtures. A pure substance is composed of only one substance, while a mixture is composed of two or more substances. There are two types of mixtures: homogeneous mixtures, where the components cannot be distinguished, and heterogeneous mixtures, where the components can be distinguished. Examples of homogeneous mixtures include coffee, milkshake, and orange juice, while examples of heterogeneous mixtures include salad, fruit salad, and paella.
This document defines waves and classifies them according to their medium and particle motion. Waves transfer energy through a medium without transferring matter. They are classified as electromagnetic waves, which can travel through empty space, and mechanical waves, which require a medium. Mechanical waves are further divided into transverse waves, where particles move perpendicular to the wave, and longitudinal waves, where particles move parallel. The document also discusses wave characteristics like frequency, period, velocity, and behaviors such as reflection, refraction, diffraction, interference, polarization, and resonance.
This document discusses the classification of matter. It defines pure substances as elements and compounds, which are uniform throughout and retain their properties. Mixtures are combinations of substances that are not chemically bonded and can be separated. Elements can be classified as metals, nonmetals or metalloids. Compounds are classified as organic or inorganic, acidic or basic. Mixtures are either homogeneous, with uniform composition, or heterogeneous, without uniform composition.
This document provides information about waves and sound waves. It defines different types of waves including longitudinal waves, transverse waves, and standing waves. It explains how the speed of a wave is calculated and provides examples of calculating wavelength and frequency. It also describes the differences between closed and open pipes and how harmonics work for each, with closed pipes producing sound at odd harmonics and open pipes at all harmonics.
Motion refers to an object changing position over time relative to a reference point. Speed is the distance an object travels divided by the time taken and is measured in meters per second or kilometers per hour. Average speed is the total distance divided by the total time. Velocity also includes direction of motion. Acceleration is the rate at which velocity changes. A force is a push or pull measured in newtons, but a force being applied does not necessarily mean motion will occur. The net force is the combination of all acting forces on an object. Gravity is the force of attraction between objects due to their mass. Weight is a measure of the gravitational force on an object that depends on its mass and location.
Chem 2 - Intermolecular Forces & Phases of Matter I Lumen Learning
This document discusses the phases of matter (gas, liquid, solid) and how intermolecular forces affect a substance's physical state. It introduces the central question of why a substance is in a particular phase at a given temperature. The key points are that a substance's phase depends on a balance between particle kinetic energies and interparticle attractive forces, and that decreasing temperature or increasing pressure can change a substance's phase by altering this balance. Different types of intermolecular forces are then ranked by their relative strengths in influencing boiling points, melting points, and vapor pressure.
This document provides an overview and comparison of various in-vitro methods used to measure antioxidant activity, including their advantages and disadvantages. It summarizes several common methods such as the Thin Layer Chromatography autography technique, Cellular Antioxidant Activity assay, Dye-Substrate oxidation method, and Cupric Ion Reducing Antioxidant Capacity method. The document emphasizes selecting methods based on feasibility, simplicity, required instrumentation and ability to effectively analyze antioxidant properties.
1. Sound is a longitudinal mechanical wave that propagates through a medium such as air or water by compressions and rarefactions which create regions of high and low pressure.
2. The document discusses several properties of sound waves including that frequency determines pitch, amplitude determines loudness, and speed depends on the properties of the medium.
3. Wave interference and phenomena like resonance, standing waves, and the Doppler effect are also covered as they relate to the nature and perception of sound waves.
This document discusses pure substances and mixtures. A pure substance is composed of only one substance, while a mixture is composed of two or more substances. There are two types of mixtures: homogeneous mixtures, where the components cannot be distinguished, and heterogeneous mixtures, where the components can be distinguished. Examples of homogeneous mixtures include coffee, milkshake, and orange juice, while examples of heterogeneous mixtures include salad, fruit salad, and paella.
This document defines waves and classifies them according to their medium and particle motion. Waves transfer energy through a medium without transferring matter. They are classified as electromagnetic waves, which can travel through empty space, and mechanical waves, which require a medium. Mechanical waves are further divided into transverse waves, where particles move perpendicular to the wave, and longitudinal waves, where particles move parallel. The document also discusses wave characteristics like frequency, period, velocity, and behaviors such as reflection, refraction, diffraction, interference, polarization, and resonance.
2. Сила Действие одного тела на другое Скорость движения Направление движения физическая величина, количественно характеризующая действие одного тела на другое
3. Дина мометр сила измеряю Обозначение силы - F Единица измерения – 1Н (ньютон) С илой в 1 ньютон назвали такую силу, которая, будучи приложенной к покоящемуся телу массой 1 кг, будет ежесекундно увеличивать его скорость на 1 м/с.
5. Масса тела Степень тяжести тела Чем больше масса тела, тем оно сильнее притягивается к Земле Если Земля притягивает к себе два тела с одинаковой силой – массы этих тел равны!
6. Единица измерения – 1кг ( 1 г, 1 мг 1 т, 1 ц, ) Обозначение массы - m 1 г = 1000 мг 1 кг = 1000 г 1 т = 1000 кг 1 ц = 100 кг Единица массы 1 кг равна массе одного литра чистой воды при температуре +4 ° С Севр ( Франция ) международный эталон килограмма
8. Сила тяжести Сила земного тяготения (гравитационная сила) – сила, с которой тело притягивается к Земле Сила тяжести всегда направлена к центру планеты Все тела падают на поверхность земли или оказывают на нее давление
9. Тело, подброшенное вверх Сила тяжести Уменьшение скорости Изменение направления движения Криволинейная траектория
10. Чем больше масса тела , тем больше сила тяжести F , Н m , кг 2 0,1 0 . . . . . 0,2 0,3 0,4 0,5 1 3 4 5 . . . . . . . Прямо пропорциональная зависимость На тело массой 100 г действует сила тяжести величиной 1 Н
11. Сила упругости С ил а , которая возникает в упругом теле при изменении его формы или размеров Сжимание, растяжение Изгибание , скручивание Сила упругости всегда направлена противоположно той силе, которая вызвала изменение формы или размеров тела
13. Сила трения С ил а взаимодействия между поверхностями тел Сила трения всегда направлена противоположно направлению движения рассматриваемого тела по поверхности другого. Величина силы трения зависит от неровности поверхности
14. Тефлоновое покрытие имеет низкий коэффициент трения с пищевыми продуктами, что обеспечивает отсутствие их пригорания. На обычной сковороде взаимодействие с поверхностью более сильное и продукты пригорают.
15. Наличие силы трения замедляет скорость движения лыжника и способствует успешному прохождению трассы.
16. Взаимодействие тел Тела взаимно действуют друг на друга с некоторой силой Скорость и направление движения мяча изменились Мяч подействовал на стену с определенной силой (сила тяжести) Стена оттолкнула мяч с определенной силой (сила упругости)
17. Равновесие сил Сила тяжести Сила упругости Сила тяжести больше силы упругости Движение вниз Сила тяжести равн а силе упругости Прекращение движения
18. Если на тело действуют силы, уравновешивающие друг друга ( равные по величине и обратные по направлению ), то оно может находится в состоянии покоя На явлении равенства силы упругости пружины некоторой другой силе основано действие динамометра . Его пружина растягивается до тех пор, пока не уравновесит измеряемую силу.
19. Сила тяжести Сила упругости Кабина лифта подвешена на тросе Кабина лифта неподвижна Сила упругости больше силы тяжести Кабина лифта поднимается с постоянной скоростью Сила упругости уменьшается и становится равной силе тяжести Если на тело действуют силы, уравновешивающие друг друга ( равные по величине и обратные по направлению ), то оно будет двигаться прямолинейно и равномерно
