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Chemistry kategorisi hakkında
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0
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172
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October 16, 2022
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Reaksiyon tamamlama
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1
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431
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November 23, 2023
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Calculate the potential difference if 20j of energy are transferred by 8c of charge
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1
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1413
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October 2, 2023
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There are two main isotopes of chlorine. 75% of chlorine atoms have a mass number of 35, while 25% have a mass number of 37. use this information to work out the relative atomic mass of chlorine
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1
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159
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October 2, 2023
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Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml. the mercury used to fill the cylinder weighs 306.0 g. from this information, calculate the density of mercury
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1
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215
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September 21, 2023
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What does a coefficient represent in a chemical formula?
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1
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193
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September 21, 2023
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How to find the area of a polygon
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1
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169
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September 13, 2023
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How can you calculate the number of neutrons in an atom
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1
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187
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September 13, 2023
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A ph of 6 is how many times more acidic than a ph of 9?
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1
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189
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September 12, 2023
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Marie discovers boxes of elements in a storage room. the boxes do not say which elements they contain, but they do have information about their locations on the periodic table
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1
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320
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September 12, 2023
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Students want to determine the impact of soil erosion from the development of new housing. they plan to measure the density of a species of algae growing along the bottom of a river that flows through their town. the town is built
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1
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440
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September 11, 2023
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How do we determine the number of electrons an element has
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1
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166
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September 11, 2023
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Copper has an isotope with an atomic mass of 62.93 and an abundance of 69.17%. a second isotope has an atomic mass of 64.93 and an abundance of 30.83%. what is the average atomic mass for copper?
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1
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142
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September 8, 2023
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Antimony has two naturally occuring isotopes, sb121 and sb123 . sb121 has an atomic mass of 120.9038 u , and sb123 has an atomic mass of 122.9042 u
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1
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126
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September 8, 2023
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What is the molar mass of an unknown gas with a density of 2.00 g/l at 1.00 atm and 25.0 °c?
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1
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507
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September 8, 2023
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What is the formula used to calculate density?
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3
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145
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September 8, 2023
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What is another name for a condensation reaction?
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1
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153
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September 6, 2023
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Which part of an amino acid is always acidic?
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1
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164
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September 5, 2023
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Which of the following properties of carbon distinguishes it from all other elements?
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1
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141
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September 5, 2023
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What information does not need to be included on a chemical waste label?
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1
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193
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September 4, 2023
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Which of the following is not produced through chemical bonding?
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1
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158
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September 2, 2023
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An ionic bond involves _____
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1
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266
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September 2, 2023
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What is the vapor pressure of a solution made from 23.5 g of glycerin in 130 g of methanol at 50 °c? the vapor pressure of pure methanol at 50 °c is 400 torr. report your answer in torr and round to the first decimal place
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1
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292
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August 31, 2023
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Which process is the total of all the chemical reactions in an organism?
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1
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234
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August 29, 2023
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What determines the types of chemical reactions that an atom participates in?
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1
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301
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August 28, 2023
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Which of these refers to atoms with the same atomic number but different atomic masses?
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1
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149
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August 28, 2023
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A block of aluminum occupies a volume of 15.0 ml and weighs 40.5 g. what is its density?
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1
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220
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August 28, 2023
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How many valence electrons does carbon have?
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1
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234
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August 22, 2023
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İf an atom has 35 protons in the nucleus how many electrons will it have orbiting the nucleus
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1
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176
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August 22, 2023
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Most chemicals can be cleaned up with a general spill kit, but a few chemicals require specialized spill procedures
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1
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427
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August 22, 2023
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