8970168
Descrição
FlashCards por Mike Schmidt, atualizado more than 1 year ago
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Criado por Mike Schmidt
mais de 7 anos atrás
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| Questão | Responda |
| The atomic number of an atom is the number of.... | Protons |
| The mass number of an atom is the number of | Protons and Neutrons |
| Explain why an atom has no overall charge. Use the relative electrical charges of sub-atomic particles in your explanation. | The relative electrical charges are - for an electron and + for a proton, and the number of electrons is equal to the number of protons |
| Explain why fluorine and chlorine are in the same group of the periodic table. Give the electronic structures of fluorine and chlorine in your answer. | The electronic structure of fluorine is 2,7 and chlorine is 2, 8, 7 so fluorine and chlorine are in the same group because they have the same number of/7 electrons in their highest energy level/outer shell. |
| What is the chemical symbol of an atom with the structure 2, 8, 6? | S |
| Compounds formed when non-metals react with metals consist of particles called... | Ions |
| Compounds formed from only non-metals consist of particles called... | Molecules |
| The main compound in limestone is calcium.... | Carbonate |
| The reaction to produce calcium oxide from limestone is thermal... | Decomposition |
| Calcium hydroxide is produced when calcium oxide reacts with... | Water |
| Calcium hydroxide is used to neutralise acids because it is an... | Alkali |
| Describe one way the students could improve the method so that their results are more accurate for each graph point. | They could repeat the experiment to calculate a mean/average value. |
| There are many theories about how life was formed on Earth. Suggest one reason why. | Not enough evidence OR life and the Earth were created billions of years ago. |
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