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A runner wants to run 12 7km. She knows that her running pace is 8.0 mi /h. How many minutes must she run
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What experimental evidence leads scientists to believe that only quantized electronic energy states exist in atoms?
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1. In the models, what particles do the colored and plain sesame seeds represent? What particles do the poppy seeds represent? 2. What does the fiberfill represent in the models? 3. In an atomic model
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Which of the following would not be classified as a result of climate change? A. Extreme weather B. Expanding glaciers C. Rising sea levels D. Increased droughts
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Baking soda is sodium bicarbonate. it is 27.37 %by mass sodium what mass of sodium bicarbonate is needed to get 1619 mg of sodium
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Note: The following questions from Question 3 to Question 9 will not refer to the tomato powder but will instead focus on the compounds whose molecular formulas are known. Complete the following chart
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There are 12 inches (in.) in 1 foot (ft). Which expression can be used to find the number of inches in 2.5 feet?
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Calculate the density of one quart of oil weighing 2.755lbs. Units for density are g/ml. Useful CFs are: 1qt=0.9463 liters and 11lb=453.592g
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This unit discusses in detail the role of catalysts to lower the activation energy of reactions. The term catalyst appears in nonscientific discussions to refer to something that provokes or speeds si
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A 0.050g ball of aluminum foil absorbs 1.4s J heat when it is heated 31.6 C what is the specific heat of aluminum foil?
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Draw an arrow pushing mechanism for the formation of the acylium ion when acetic anhydride reacts with phosphoric acid.
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Scott scoops hot oatmeal into his bowl. He then notices that the outside of the bowl is very hot to touch. what type of heat energy transfer is this an example of?
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The price of a ream of paper is $4.00. There are 500 sheets of paper in a ream. If a sheet of paper weighs 0.500 gram. What is the price of 2.75 pounds of paper? (453.6 g = 1 pound)
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A solution is made by dissolving 15.5 grams of glucose (C6H12O6) in 245 grams of water. What is the freezing point depression of the solvent if the freezing point constant is -1.86 °C/m? Show all of
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What is the length(in cm) of the side of an iron ingot (rectangular box) that has a mass of 4.578 kg and has width = height = 5.00cm
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Calculate the heat capacity of a calorimeter if the combustion of 4.7 g of benzoic acid led to an increase in temperature of 7.2 °C.
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(3 pt) Which statement correctly identifies the revolution and rotation of the planets in the solar system? A. Planets rotate around the sun and revolve on an axis. B. The sun revolves around the plan
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What is the atomic number of the yet-undiscovered element directly below francium ( Fr) in the periodic table?
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What enabled Moseley to determine the number of electrons in atoms of particular elements? A. He measured the mass of a given volume of the element. B. He measured the temperature of the element in an
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The rights of workers to seek saftey and health on the job without feet of punishment is spelled out in:
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QUICKLY! 2C (s) + 2H2 (g) C2H4 (g) Which of the following best describes this reaction? A) The reaction will be spontaneous at any temperature. B) The reaction will not be spontaneous at any temperatu
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Which represents a balanced nuclear equation? a. 23/11 Na ----> 24/12 Mg +1/1 H b. 24/11 Na----> 24/12 Mg +1/-1 e c. 24/13 Al ---->24/12 Mg+0/-1 e d. 23/12 Mg---> 24/12 Mg +1/0 n
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If we reverse the reaction to read Z + Q → X + Y, the +ΔH would be a -ΔH. Does this indicate that heat is given off or absorbed in the reverse reaction?
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Aspirin (acetylsalicylic acid, c9h8o4) is a weak monoprotic acid. to determine its acid-dissociation constant, a student dissolved 2.00 g of aspirin in 0.600 l of water and measured the ph. what was t
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If you have 3.64 grams of agno3, how many molecules of cu do you need to fulfill the reaction 2agno3 + cu -> cu(no3)2 + 2ag
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Be sure to answer all parts. devise a synthesis of x from the given starting materials. you may use any inorganic or organic reagents. 16203a part 1 out of 3 draw the product of the diels-alder reacti
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Explain why ethyl acetate is insoluble in water, but soluble in hexane using specific IMFs. (intermolecular forces)
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Which action would shift this reaction away from solid silver chloride and toward the dissolved ions?
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Can anyone explain to me how to balance a chemical equation? im having trouble in understanding how i keep getting it wrong.
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Carbon dioxide is always made of ____ parts of oxygen to ____ parts carbon by mass. It’s asking for the mass ratio of these elements.
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A 5.0 gram sample of lead and a 3.2g sample of iron are placed into 367ml of water. What will be the new volume level of water in units of ml?
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Determine the number of grams of aluminum chlorine that is produced when 56.9 g of hydrochloric acid are reacted with excess of aluminum
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How many protons neutrons and electrons are there in a neutral atom of the isotope of silver named silver-109
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The addition of 15 g of salt to a sample of pure water causes its freezing point to be reduced by 1.3°C. What would be the effect of dissolving an additional 15 g of salt into the solution? A. There
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You have a balloon containing 1 L of air at STP in a vacuum chamber. What will the volume of the balloon be when you reduce the pressure by half and increase the temperature to 373 K? (Use the combine
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A balloon contains 0.5 L of air at 273 K. Its volume increases to volume of 0.75 L at constant pressure. What is the temperature of air inside the balloon?
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Which of the following pairs are isotopes of each other? A. 32S and 32P B. 18O and 18F C. 7Li and 9Be D. 14N and 15N
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If 3.0 grams of strontium-90 in a rock sample remained in 1989, approximately how many grams of strontium-90 were present in the original rock sample in 1933?
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Find the radius (r) of an aluminum cylinder that is 2.80 cm long and has a mass of 13.7 g . For a cylinder, V=πr2l. (The density of aluminum is 2.70 g/cm3.)
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Problem 3. When the volume of a container of gas changes by a certain factor at a constant temperature, the pressure doubles. By what factor does the containers volume change?
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32 ml of ethanol with an initial temperature of 11 Celsius absorbs 562 joules of heat Find the final temperature of the ethanol
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Imagine you are working in a laboratory that makes tablets for relieving indigestion. The tablets work by reacting with water or acid in the stomach. Carbon dioxide gas is produced as a result. You ar
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I'M GIVING 50 POINTS!!!!! NEEDS TO BE CORRECT EXPLAIN!!!!!!!!! How many kinds of atoms are in ammonia, NH4OH? A. 3 B. 4 C. 6 D. 7
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Which term names the result of two or more atoms combining chemically? A. compound B. gas C. element D. reactant I'M GIVING 85 POINTS EXPLAIN AND IT NEEDS TO BE CORRECT!!!!!
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What energy conversion occurs when a plant uses energy from the sun to make sugar stored in fruit? (2 points) Question 2 options: 1) Radiant energy is converted to thermal energy. 2) Radiant energy is
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A compound has a chemical composition of .62 g carbon, .10 g hydrogen, .28 g oxygen. What is the empirical formula?
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A compound has a chemical composition of 97.6 g carbon, 4.9 g hydrogen, 52 g oxygen, 45.5 g nitrogen. What is the empirical formula? a. C3H3O2N2 b. C10H6O4N4 c. C5H3O2N2 d. CHON
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The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. Which comparison is best supported by this information?
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A thin square sheet of lead measuring 2.5 inches on each side weighs 525 mg. Find the thickness (in mm) of the sheet, given the density of lead to be 11.342 g/cc. (1 inch = 2.54 cm). Do not use scient
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The diameter of a chlorine atom is 200. pm. How many chlorine atoms are required to line up end to end to stretch a distance of 1.0 mm? Use 'E' for scientific notation.
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