Carbon-12 represents an isotope of carbon with 6 protons and 6 neutrons while uranium-238 is an isotope of uranium that has 146 neutrons. A 1 2 and 3.
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Answer all questions.
. Bases chlorine trifluoride nitric acid acetaldehyde chlorosulfonic acid oleum bromine pentafluoride perchloric acid potassium tert-butoxide. Krypton Kr chemical element a rare gas of Group 18 noble gases of the periodic table which forms relatively few chemical compounds. 1 mark Tick one.
3 Bromine reacts with benzene less readily than with cyclohexene. One of the bromine atoms can lie above the ring of the cyclohexane and the other below the ring resulting in the trans- isomer. B There are one thousand times as many bromine atoms as neon atoms.
The information above is believed to be accurate and represents the best information currently available to us. It gives the number of atoms of each element present in one molecule. Calculate the molecular masses of the following.
Atomic number7 atomic weight140067 melting point20986 C 3458 F boiling point1958 C 3204 F density 1 atm 0 C12506 gramslitre usual. It is a colourless odourless tasteless gas that is the most plentiful element in Earths atmosphere and is a constituent of all living matter. The atomic number represents both electrons and.
The average 70 kg 150 lb adult human body contains approximately 7 10 27 atoms and contains at least detectable traces of 60 chemical elements. An atom of bromine has a mass about four times greater than that of an atom of neon. Represents an atom of element.
A What is the rate law for the reaction. Name the parts of the atom labelled. Bromine has two isotopes 79 Br and 81 Br whose masses 789183 and 809163 amu and abundances 5069 and 4931 were determined in earlier experiments.
H 1 u. A bromine sample has an average mass number of 80 but as it turns out a single bromine atom almost always has a mass number of 79 or 81. If bromine atom is available in the form of say two isotopes _3579Br497 and _3581Br503 Calculate the average atomic mass of bromine atom.
Report your answer to 3 significant figures. Br 80 u Solution. The marks for each question are shown in brackets.
About three times heavier than air krypton is colourless odourless tasteless and monatomic. The relative amounts of each element vary by individual mainly due to differences in the proportion of fat muscle and bone. The majority of symbols consist of one or two letters but three-letter symbols have been used to describe some elements with atomic numbers greater than 112.
Nitrogen N nonmetallic element of Group 15 Va of the periodic table. Fill in the boxes at the top of this page with your name centre number and candidate number. 201-796-7100 For CHEMTREC assistance call.
Of bromine is 80 Which statement is true about the number of each type of atom in bromine. It represents one molecule of a substance. 10 20 30 40 50 60 70 80 90 20 40 60 80 100 Which ion is responsible for the peak with the greatest relative intensity.
Answer the questions in the spaces provided there may be more space than you need. Both the bromine atoms can lie above the cyclohexane ring resulting in the cis-isomer. Information The total mark for this paper is 80.
To complete its octet oxygen gains 2 electrons hence the valency of oxygen is 2. A chemical formula represents its name. Although traces are present in meteorites and minerals krypton is more plentiful in Earths atmosphere which contains 114 parts per million.
Molecular mass of hydrogen bromide HBr 1 x H 1 x Br 1 80 u 81u. The shape around each carbon atom is tetrahedral and there are two alternative ways the bromine atoms can arrange themselves. About 29 of these elements are thought to play an active positive role in life and health in humans.
Atomic number of oxygen is 8 and the electronic configuration is 26. The rate of disappearance of bromine was measured for several different concentrations of acetone bromine and H ions at a certain temperature. Find the number of electrons.
B Determine the rate constant using the data from experiment 1. Which choice makes the correct comparison of the relative numbers of bromine and neon atoms in 1000 g of each element A The number of bromine and neon atoms is the same. Calculate the average atomic mass of bromine based on these experiments.
Some symbols are derived from the elements common name while others are abbreviations of the elements name in another language. It is also common to state the mass number after the name of an element to indicate a particular isotope. Atoms than There are more There are fewer.
Last name First name Candidate number Centre number Oxford Cambridge and RSA A Level Chemistry A.
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