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In a chemical change A. materials retain their properties. B. materials change their properties. C. new materials do not form. D. new materials formed are always in liquid form.
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how do i caculate the trmperature change that 725 grams of aluminum will undergo when 2.35x10^4 Joules of thermal energy are added to it?
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What particles are contained in the nucleus of an atom?O electrons & protonsO neutrons & electronsO neutrons & protonsO pixels & electrons
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Based on the following chemical equation how many molecules of Hydrogen (H) are present in the reactants side?2H2 + O2 ----> 2H2OQuestion 1 options:1234
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ANSWER QUICK !!! How many grams of hydrogen gas will be produced if you start with 15.0 grams of zinc and an excess amount of HCI? balanced equation:Zn + 2HCI = ZnCl2 + H2
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Explain in terms of intermolecular forces why water has an unusually high heat of fusion?
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A car covers a distance of 22.75 km in 17.04 minutes. Use dimensional analysis to calculate its speed in meters/second. Do not enter units in your answer.Round to the tenths place or further.
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115 mL of a 2.35 M potassiumfluoride (KF) solution is diluted with 1.28 L of water. What is the new concentration in molarity? ? M KF
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A mining crew extracted two different types of minerals from underground.Then, they transferred the same amount of energy into both minerals. Why didmineral A change while mineral B stayed the same? Explain what happened tothe molecules of both minerals.
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Can someone pls help me on this
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Which of the following is the poorest conductor of electricity? Calcium (Ca) Silicon (Si) Fluorine (F) Sodium (Na) Cobalt (Co)
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A mass of a gas occupies 840cm cube at 750mm pressure, what volume would it occupy at 780mm pressure
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The molecular weight of KMnO4 is 158 g/mol. If you wanted to make 500 mL of a 0.1M stock solution of KMnO4, how much solid KMnO4 would you need to add before filling mL flask of water?
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help pleaseeeeee. dbdb
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What is the molality of a solution made by dissolving 2 moles of NaOH in 6 kgof water?A. 0.33 mol/kgB. 12 mol/kgC. 3 mol/kgD. 2 mol/kg
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Which of the following is true for an excess reactant? A) It is the reactant whose atoms remain unbalanced in the equation. B) It is the reactant that produces a smaller amount of a product. C) It is the reactant that is left over after the reaction stops. D) It is the reactant that produces one mole of a product.
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WORTH 40 POINTS HELLPPPPWhat class of element is Astatine (At)?
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5.4 g of Aluminium reacts with 300 mL of 0.2 mol/L hydrochloric acid solution. a. Write equation for the reaction taking place. b. Specify which reactant is limiting and which reactant is excess. c. Find volume of the gas collected at S.T.P d. How many grams of salt are produced at the end of the reaction? e. How many grams of the excess reactant are left ate the end of the reaction? Given: Al=27 , H=1 , Cl=35.5
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Fish in a frozen lake can survive throughout the winter months duepartially to the fact that lakes don't freeze solid. Fresh water has a densityof 1.00 g/cm3. A piece of ice has a mass of 57g and a volume of 62 cm3.Give the density of the piece of ice (use the density formula d = m/V) andexplain what will happen to it in the lake.
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Latitude determines how much intense sun an area gets, but what other factors can impact regional climate?A. The weather forecastB. Population C. Ocean currents, mountains, and altitudeD. The type of animals that live there
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5.4 g of Aluminium reacts with 300 mL of 0.2 mol/L hydrochloric acid solution. a. Write equation for the reaction taking place. b. Specify which reactant is limiting and which reactant is excess. c. Find volume of the gas collected at S.T.P d. How many grams of salt are produced at the end of the reaction? e. How many grams of the excess reactant are left ate the end of the reaction? Given: Al=27 , H=1 , Cl=35.5
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"Henry mixed salt and water together in a cup until he observed a clear solution. He measured the mass of the solution. Then he placed the cup outside for several sunny days during the summer. After a week, he observed that only solid salt remained in the cup and the mass had decreased. Henry concluded that a physical and chemical change occurred in this investigation."Which statements correctly defend or dispute his conclusion?A.)He is correct. Dissolving salt in water is a physical change, but evaporating the water is a chemical change. Formation of a solid is evidence that a chemical change occurred.B.)He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.C.)He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.D.)He is incorrect. Dissolving salt in water and evaporation of the water are both chemical changes. The reappearance of salt is evidence that the change was reversible by a chemical change, so it could not be a physical change.
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The beakers in the picture above are labeled according to the ionic solutions they contain. What metal or metals could replace copper in the copper(II) nitrate solution?
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Pleas help with 2 and 4 for brainliest
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