90603
| Questão | Responda |
| what are the charges of the ions in magnesium oxide? | Mg+2 0-2 |
| what is the formula of calcium chloride? | CaCl2 |
| what are the charges of the ions in calcium chloride? | Ca 2+ 2Cl1- |
| what are compounds? | substances in which atoms of two or more elements are chemically combined |
| what is the aim of an element when bonding chemically? | to achieve the electronic structure of a noble gas |
| If an ion has a charge of -3 what group is it likely to be from? | group 5 |
| what forms when atoms form chemical bonds by transferring electrons? | ions |
| the alkali metals react with non metal elements to form what? what charge does the metal have? | ionic compounds and the metal ion has a single positive charge |
| the halogens react with alkali metals to form what? what charge do the halides have? | ionic compounds and the halide ions hacve a single negative charge. |
| how are ionic compounds held together? | by strong electrostatic forces of attraction |
| in what direction do the forces in a ionic compound act? | The forces act in all directions in the lattice |
| what is formed when atoms share electrons? | covalent bonds |
| what is formed when atoms share electrons? | covalent bonds |
| are covalent bonds strong or weak? | strong |
| what are giant structures that are covalently bonded called? name 2 examples | macromolecules 1)diamond 2)silicon dioxide |
| is HCL a simple or giant structure of covalent bonding? | simple |
| what is the structure of a metal? | consists of atoms arranged in a regular pattern. |
| what is special about the structure of metals? | The electrons in the highest energy level are delocalised and so free to move throughout the whole structure. There are strong electrostatic attractions |
| what is the formula for ammonia? | NH3 |
| what is the formula for hydrogen chloride? | HCl |
| what is the formula for methane? | CH4 |
| what 2 elements are there is silicon dioxide | silicon and oxygen |
| what are the charges of the ions in sodium chloride | NA+1 Cl-1 |
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