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GCSE Chemistry 1 - Introduction to Chemical Reactions
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An atom begins neutral. It loses two electrons, then gains 4. What is the final charge of the atom?
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What is the coefficient of chlorine (Cl) in the following reaction, when it is balanced? H2O + Cl --> HCl + O
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What is the coefficient of HCl in the reaction above, when it is balanced?
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What is the coefficient of O in the reaction above, when it is balanced?
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An atom has 9 protons, 6 neutrons, and 12 electrons. Which of the following are true?
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The atom is Oxygen
The atom is Carbon
The atom is Fluorine
The atomic mass is 21
The atomic number is 9
The atom is positively charged
The atom is neutral
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An atom has 9 protons, 6 neutrons, and 12 electrons. Which of the following are true?
1 point
The atom is Oxygen
The atom is Fluorine
The atom is Carbon
The atomic mass is 21
The atomic mass is 9
The atomic number is 9
The atom is positively charged
The atom is neutral
When you move along the rows of the periodic table, what properties of the atoms change?
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Why is it necessary to balance chemical equations? Use the following terms in your answer: Conservation, atoms, nucleus, matter, create
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