Chemistry

The Sun is important in many ways. What is the purpose of the Sun in the food chain? *
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Windmills are sometimes helpful for some small rural communities.TrueFalse
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6) A student measures out 96.21 g of sulfur for an experiment. How many moles of Sulfur are in thissample? (show your work!)
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Which substance is soluble in water?
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What do we examine to understand the differences between the different states of matter?A. Electronegativity of the matter presentB. Moles of matter present.C. Behavior of the particlesD. Size of the particles
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What is mass times acceleration equal to?
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Number 6Metals react with _______ to form co.pounds that are like alkaline.A. Non metalsB. OxygenC. HydrogenD. Metalloids
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The pH of tomato juice is 4, thus tomato is a (an) _______________ substance
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which pollutants come from air? How and why do these form?
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Reactants for a certain reaction are combined in a solution. Which solutionwould have the most successful collisions and so enable the reaction toproceed quickly?A. A solution at low concentration and low temperatureB. A solution at high concentration and low temperatureO C. A solution at high concentration and high temperatureD. A solution at low concentration and high temperature
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2Na(s) + Cl2(g) - 2NaCl(s) + 822 kj
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An atom of a certain element has 19 protons, 19 electrons, and a mass number of 39. This element is very reactive. How many neutrons are in this atom?
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A restaurant advertises that it is environmentally friendly. It describes the solar panels it uses to generate electricity and the locally grown produce it serves. All the meals it offers are prepared over an open wood fire. Food is served on recycled copper plates, and drinks are served in recycled aluminum cups.Which correctly lists three renewable resources used by the restaurant?aluminum, copper, producecopper, produce, sunlightproduce, sunlight, woodsunlight, wood, aluminum
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If a compressed air cylinder for scuba diving contains 6.0 L of gas at 18C and 200 atm pressure, what volume does the gas occupy at 1.0 atm and 25C?
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For each of the environments below: (1) identify your system and surroundings and (2) predict whether it would be endothermic or exothermic.a.Wood burningSystem:Surroundings:Enthalpy Change:b.Water freezingSystem:Surroundings:Enthalpy Change:c.Sweat evaporatingSystem:Surroundings:Enthalpy Change:d.Chemical hand-warmerSystem:Surroundings:Enthalpy Change:
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3. The density of ethanol is 0.789 g/mL. How many grams of ethanol should be mixed with 225 mL of water to make a 4.5% (v/v) mixture?
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what is one property of skim milk indicating that it is a colloidal dispersion?
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what are the five major types of celestial bodies in the solar system
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Which of the following phases of matter has a fixed volume but not a fixed shape?A Liquid B Gas C Solid D Plasma
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Finish the essay technology improves nursing Technology has helped correct medical errors with safety checks, finding an early diagnosis of a disease, and more. Technology is a huge part of nursing........
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neeed morreeeee help w science
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How do chemists count the number of representative particles in a substance?
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how many grams of silver chloride are produced from 15.0 g of silver nitrate
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A gas goes from 1L at 273 K to 2 L when heated. What is the new temp?
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