13709177
Descripción
Fichas por Sara. H S., actualizado hace más de 1 año
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Creado por Sara. H S.
hace más de 6 años
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| Pregunta | Respuesta |
| define the term: compounds | Substances that are made up of more than more than one atom. |
| Give four examples of compounds | 1. Water - a clear liquid 2. Salt - a white crystalline solid 3. Vegetable oil - a slippery, yellow liquid 4. Candle wax - soft solid that easily melts |
| How many elements is your body made up of? | 16 |
| Name the 6 elements that make up 98.5% of your body | Oxygen: 65% Carbon: 18% Hydrogen: 10% Nitrogen: 3% Calcium: 1.5% Phosphorus: 1% |
| What is a molecular compound? | A compound where the atoms share electrons through covalent (chemical) bonds. |
| Give three examples of molecular compounds | Carbon monoxide (CO), water (H2O) and glucose (C6H12O6). |
| How long can the molecule deoxyribonucleic acid (DNA) be and where is it found? | DNA is found in the nucleus of a cell and its fine threads can be stretched from 2-3 metres - DNA is long (｡ŏ_ŏ) |
| What are lattice compounds? | Compounds that have atoms that are bonded via repetitive, grid-like structure. |
| Give two examples of lattice compounds | Table salt/sodium chloride (NaCl) and beach sand/silica/silicon dioxide (SiO2) |
| What is air -a mixture- composed of? | Oxygen, Carbon dioxide, Nitrogen, Water Vapour, Carbon Monoxide |
| What indicates that something is a mixture rather than a molecule or compound? | The fact that mixtures have lists of ingredients due to not being bonded while compounds and molecules have chemical formulas. |
| What is a solution? | A mixture with a substance dissolved in another substance. |
| What is the solute? | The dissolved substance |
| What is a solvent? | The substance that something is dissolved in. |
| What is the term for a solution that has water as its solvent? | an aqueous solution |
| Give two examples of solutions | salt-water (aqueous) and smoke |
| What type of mixture is shaving foam? | a colloid |
| Is milk a mixture? | Yes. |
| What is an alloy? | A mixture with metals, other metals and/or non-metals. |
| Give four examples of alloys and their uses | Stainless Steel (iron, carbon, chromium and nickel): tools and cutlery Brass: doorknobs, tap fittings and coffee pots Solder: connects components in electrical circuits Sterling Silver: jewellery |
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