Chemistry

What type of element is generally largest
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Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular theory?higher temperature more kinetic energy more space between particles higher volumehigher temperature less kinetic energy less space between particles higher volumeo higher temperature more kinetic energy less space between particles lower volumehigher temperature less kinetic energy more space between particles lower volume
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How many moles are in 100g of carbon dioxide?A.2.27 molB.3.51 molC. 2.36 molD. 1.49 mol
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A 0.80 L sample of gas has a temperature of 27C and a pressure of 0.925 atm. How many moles of gas are present?
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When a substance changes from a liquid to a solid, it has reached its _____ point
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50 POINTS!!!Calculate the Pressure in atmospheres of 0.5 mol of helium (He) at 20 degrees celcius and occupying 2.50 L. Show all work.
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What is the ideal pH level for your blood?
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which of the following would be a valid hypothesis for a scientific investigation about food shopping decision affect food security?A spending more money on food results in food of higher nutritional valueB why do people shop at supermarkets more often than local farmers marketsC how is the cost of a food related to its nutritional valueD I prefer the taste of foods purchase from local farmer market
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PLEASE HELPConsider the chemical equations shown here.3 equations. 1: upper N upper O gas plus upper O subscript 3 gas right arrow upper N upper O subscript 2 gas plus upper O subscript 2 gas. Delta H subscript 1 equals 198.9 kilojoules. 2: StartFraction 3 over 2 EndFraction upper O gas right arrow upper O subscript 3 gas. Delta H subscript 2 equals 142.3 kilojoules. 3: upper O gas right arrow one half upper O subscript 2 gas. Delta H subscript 3 equals negative 247.5 kilojoules.What is DeltaHrxn for the reaction shown below?NO(g)+O(g)->NO2(g)
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Use the term DNA in a sentenceabout proteins.
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Molecules have Question 1 options: A) both potential and kinetic energy. B) neither kinetic nor potential energy. C) only kinetic energy. D) only potential energy.
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ellusWhat is the pH of a 3.5 x 10-11 MH+ solution?pH = [?]
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Select the correct answer.Which action reflects irresponsible lab safety behavior?A. not wearing goggles when breaking a rock with a hammerB. not shaking hands with your lab partner after a successful experimentC. not chatting with others while mixing two reactive chemicalsD. not sharing findings and recordings with the general publicE. not using scientific tools while making crucial observations
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A sample of gas at occupies 10m3 at a pressure of 120 kPa. If the volume of the sample is changed to 3m3, what is the new pressure of the gas?
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Which statements describe gridlines on a map? Select three options. They are measured in degrees. They set up a reference system. They make straight lines on a globe. They run north to west and south to east. They divide Earth into four equal parts.
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2NaOH + H2SO4 > Na2SO4 + 2H2OIf you begin with 100 g of each reactant, how many moles of water will be formed?
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Students are comparing the physical properties of sugar water, salt water,and plain water,including the affects of thermal energy. What safety equipment is needed?A-Graduated Cylinder and glovesB-safety goggles and thermometerC-thermometer and hot plateD-safety goggles and gloves
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Help please! I dont know what subject to pick this is science tho!!!!!!!!!!!!!!!
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26.9 g of solid lithium is combined with 20.0 grams of nitrogen gas. . When the reaction is complete, an actual yield of 32.5 grams of solid product is produced. Need to know how to do it, please help me soon!
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Give the molecular geometry and number of electron groups for sf4. give the molecular geometry and number of electron groups for . square planar, 6 electron groups square pyramidal, 6 electron groups t-shaped, 5 electron groups octahedral, 6 electron groups seesaw, 5 electron groups
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K + Li2O what is the product
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A group of tissues working together is?
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a _____ is substance in which one or more atoms have the same number of protons (I.e. the same atomic number)
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Consider the following intermediate chemical equations.2 equations. First: upper P subscript 4 (s) plus 6 upper C l subscript 2 (g) right arrow 4 upper P upper C l subscript 3 (g) delta H 1 equals negative 4,439 kilojoules. Second: 4 upper P upper C l subscript 3 (g) right arrow upper P subscript 4 (s) plus 10 upper C l subscript 2 (g) Delta H 2 equals 3,438 kilojoules.What is the enthalpy of the overall chemical reaction Upper P upper C l subscript 5 (g) right arrow upper P upper C l subscript 3 (g) plus Uper C l subscript 2 (g).?-999 kJ-250. kJ250. kJ999 kJ
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