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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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How much would it cost for me to go 4 years to palomar college to become a chemist without financial aid?
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Miguel de Cervantes spent his young adult life in the military, only becoming an accomplished _____ later in his life.
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You have performed an iodometric titration to determine the vitamin C concentration of 25.00 mL of an unknown solution. 33.45 mL of a 2.030 x 10-3 M solution of KIO3 were needed to reach the endpoint.
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What can be said about the polarity of water? A. It causes water molecules to be attracted to other water molecules. B. It prevents hydrogen bonds from forming between water molecules. C. It's the res
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1. Explain why the can collapsed using the Combined Gas Law where T1 is the initial temperature of the air inside the can before the can was inverted and T2 is the temperature of the air inside the ca
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In the vertical columns of the periodic table: Atomic weight increases from top to bottom. Outer shell electrons increases from top to bottom. The number of shells increases from top to bottom. All th
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How many liters of oxygen gas, at standard temperature and pressure, will react with 35.4 grams of calcium metal? Show all of the work used to solve this problem. 2 Ca + O2 yields 2 CaO
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In a fission reaction of U-235, there was a release of 9.20 × 1011 kJ of energy. What amount of mass in kilograms would have been lost? Recall that c = 3 × 108 m/s. 1.02 × 10-2 1.02 × 10-5 1.02 ×
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Both artists and scientists contribute to our understanding of the world around us. Identify the ways that art and science are similar. Check all that apply. Both artists and scientists use their imag
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Year 1. each finished mug requires 0.4 pounds of material (do not round your intermediate calculations).
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The highest pressure ever produced in a laboratory setting was about 2.0 x 10^6 atm. If we have a 1.0 x 10^-5 liter sample of a gas at that pressure, then release the pressure until it is equal to
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In the following reaction, how many grams of oxygen will react with 10.47 grams of benzene (C6H6)? 2C6H6 + 1502 12CO2 + 6H2O The molar mass of benzene is 78.1074 grams and that of O2 is 32 grams.
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Which is a conjugate pair in the following equilibrium?H2C2O4(aq) + HPO42-(aq) HC2O4-(aq) + H2PO4-(aq)
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After millions of years, sedimentary rock containing phosphorus is uplifted from plate tectonic activity. Follow the phosphorus molecules found in the rock through the whole phosphorus cycle, by numbe
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What's the number of electrons that must be gained by atoms of chlorine to achieve a stable electron arrangement?
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Element x reacts with chlorine to form an ionic compound that has the formula xcl2 to which group on the periodic tAble could element x belong
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What is the freezing point of a solution that contains 0.550 moles of NaI in 615 g of water? (Kf = 1.86°C/m; molar mass of water = 18 g) 1.66°C –3.33°C 3.33°C –1.66°C
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1. If every oxygen ion (combined with an aluminum ion) has a charge of –2, what must the charge of each aluminum ion be? How can you tell this?Write at least two complete sentences.
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How many carbon atoms are present in 0.92 moles of C2H6O? a. .92 C atoms b. not enough information c. 1.3 x 10-23 atoms d. 1.11 x 1024 atoms
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Hydrogen peroxide (H2O2) is a compound made from two elements: Hydrogen and oxygen. Water (H2O) is also a compound made from hydrogen and oxygen. What makes these two compounds different?
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In terms of environmental impact, what’s the difference between natural gas, coal, and biomass? Consider both carbon dioxide (CO2) emissions and acid rain.
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Suppose an experiment is designed to test the durability of batteries in different conditions. All of the batteries tested are double-A (AA) Brand X. All sets of batteries are preconditioned in differ
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Water that flows from behind a large dam can cause machines to produce electricity. What change takes place? Question 6 options: A.Heat energy changes into mechanical energy. B.Chemical energy is used
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The mass of the rock is 25 grams. It is then placed into a graduated cylinder to find its volume (see the picture below). What is the rock's density? Use the formula D=m/v
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At 19.7 grams metal rod was placed to a cylinder with water, the liquid level raised from 18.4ml to 22.6ml what is the density of the metal
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You have diluted solution of nitric acid with the concentration of 1,5 mol/l, available. What volume would you have to take from it in order to make another weaker solution with the concentration 0,2
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How many moles of the excess reactant remain unreacted when the reaction is over if 5 moles of silver sulfide react with 8 moles of aluminum metal?
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Terephthalic acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only C, H, and O. Combustion of 20.20 mg terephthalic acid produces 42.81 mg CO2 and 6.57
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One type of gas mixture used in anesthesiology is a 50%/50% mixture (by volume) of nitrous oxide (n2o) and oxygen (o2), which can be premixed and kept in a cylinder for later use. because these two ga
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The Practical rule is that a radioactive nuclide is essentially gone after 10 half-lives what percentage of the original radioactive new nuclide is left after 10 half-lives how long will it take for 1
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Design an experiment to collect data that supports the claim that a 0.25 M KCl solution is a homogeneous mixture. Describe the steps, the data you would collect, and how the data support the claim. La
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Consider the following three-step representation of a reaction mechanism. Step 1: A + B mc016-1.jpg AB (fast) and the rate = k[A][B] Step 2: AB + B mc016-2.jpg AB2 (slow) and the rate = k[AB][B] Step
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1.8g of organic compound on combustion give 3.21g of CO2, 1.322g of H2O.Calculate the empirical formula of the compound.
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When a 10 mL graduated cylinder is filled to the 10 mL mark, the mass of the water was measured to be 10.055 g at 20ºC. If the density of water is taken to be 0.9975 g/mL at 20ºC, what is the percen
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Which resonance structure of the phosphate anion, [po4 ]3−, is not equivalent to the other three? g?
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0.64 g of adrenaline in 36.0 g of CCl4 produces a bp elevation of 0.49 °C. What is adrenaline's molecular weight? Kb value for CCl4 is 4.95 °C/m.
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