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chem303.s1.d04
cava chem 303 s1 1.05 Pure Substances
| Question | Answer |
|---|---|
| Matter can be found as a [...] or a pure substance. | Matter can be found as a mixture or a pure substance. |
| The miner's pan contained a mixture of water, sediment, sand, gold, and other things. A mixture is a collection of two or more pure substances just sort of mixed together, but not [...] together. | The miner's pan contained a mixture of water, sediment, sand, gold, and other things. A mixture is a collection of two or more pure substances just sort of mixed together, but not bonded together. |
| A pure substance is something that’s made of only [...] . It may be made of only [....] type of atom (such as copper), or it could be made of different atoms bonded together (such as sodium chloride NaCl). | A pure substance is something that’s made of only one thing. It may be made of only one type of atom (such as copper), or it could be made of different atoms bonded together (such as sodium chloride NaCl). |
| NaCl (sodium chloride) is a pure substance because it’s made of sodiums and chlorides [-ed] together to make a new thing (NaCl; not Na and Cl). | NaCl (sodium chloride) is a pure substance because it’s made of sodiums and chlorides bonded together to make a new thing (NaCl; not Na and Cl). |
| Mixing sodium atoms (Na) and chlorine atoms (Cl) together (not bonding them together) would make a mixture of sodium and chlorine; not a [...]. | Mixing sodium atoms (Na) and chlorine atoms (Cl) together (not bonding them together) would make a mixture of sodium and chlorine; not a pure substance. |
| If you chemically bond sodium (Na) and chlorine (Cl) together, you make a [...]: sodium chloride (NaCl); not a [...] of the two (Na + Cl). | If you chemically bond sodium (Na) and chlorine (Cl) together, you make a new pure substance: sodium chloride (NaCl); not a mixture of the two (Na + Cl). |
| Chemically [...] two different substances together makes them a new pure substance; not a mixture. | Chemically bonding two different substances together makes them a new pure substance; not a mixture. |
| Throwing together two different substances (without chemically bonding them) creates a [...]; not a new pure substance. | Throwing together two different substances (without chemically bonding them) creates a mixture; not a new pure substance. |
| Pure substances can be composed of either pure [...] or pure elements. | Pure substances can be composed of either pure compounds or pure elements. |
| A [...] is a substance composed of two or more elements chemically bonded together in a fixed proportion. | A compound is a substance composed of two or more elements chemically bonded together in a fixed proportion. |
| An [...] is matter made of only one kind of atom. | An element is matter made of only one kind of atom. |
| 'Elemental’ means basic, primary, simple. Elements are the simplest forms of matter because they are made from only one kind of [...] | 'Elemental’ means basic, primary, simple. Elements are the simplest forms of matter because they are made from only one kind of atom |
| An element is matter made of only one kind of atom. It [does / doesn't] matter if it’s composed of single atoms (as in helium), or groups of a trillion atoms bonded together (as in a diamond) | An element is matter made of only one kind of atom. It doesn’t matter if it’s composed of single atoms (as in helium), or groups of a trillion atoms bonded together (as in a diamond). |
| Oxygen gas is composed of two oxygen atoms bonded together. Ozone is composed of three oxygen atoms bonded together. Despite their differences, both are considered ‘[...]’. | Oxygen gas is composed of two oxygen atoms bonded together. Ozone is composed of three oxygen atoms bonded together. Despite their differences, both are considered ‘elements’. |
| Water is made of two hydrogen atoms chemically bonded to one oxygen atom. This makes water a [...] because it is made of different types of atoms bonded together in a fixed ratio (2:1) | Water is made of two hydrogen atoms chemically bonded to one oxygen atom. This makes water a compound because it is made of different types of atoms bonded together in a fixed ratio (2:1) |
| Water is made of two hydrogen atoms chemically bonded to one oxygen atom. This makes water a [...] substance because it is composed purely of these molecules. | Water is made of two hydrogen atoms chemically bonded to one oxygen atom. This makes water a pure substance because it is composed purely of these molecules. |
| To ‘[...]’ is to add together. A [...] word, is one word added to another (e.g. foot+ball = football). In chemistry, [-s] are atoms added to each other with chemical bonds (e.g. Na + Cl → NaCl). | To ‘compound’ is to add together. A compound word, is one word added to another (e.g. foot+ball = football). In chemistry, compounds are atoms added to each other with chemical bonds (e.g. Na + Cl → NaCl). |
| [-s] can be separated by physical means such as filtering, boiling, freezing, etc. [-s] cannot. | Mixtures can be separated by physical means such as filtering, boiling, freezing, etc. Pure substances cannot. |
| Among pure substances, [-s] can be chemically separated into their different atom types. Elements are made of only one type of atom; they can’t be separated into different types of atoms because there’s only one type. | Among pure substances, compounds can be chemically separated into their different atom types. Elements are made of only one type of atom; they can’t be separated into different types of atoms because there’s only one type. |
| We have chemical [s-s] (one or two-letters) for each known element. | We have chemical symbols (one or two-letters) for each known element. |
| 'Copper’ is a [...]; not a symbol. [-s] are words; symbols are not. | 'Copper’ is a name; not a symbol. Names are words; symbols are not. |
| 'Cu’ is not the name of a metal. It’s the [...] for the metal named copper. | 'Cu’ is not the name of a metal. It’s the symbol for the metal named copper. |
| In a chemical symbol, the first letter is always a [...] letter. If there is a second letter, it’s always lower-case. | In a chemical symbol, the first letter is always a capital letter. If there is a second letter, it’s always lower-case. |
| A compound can be represented by a chemical [...]; not a symbol. Symbols are for elements. | A compound can be represented by a chemical formula; not a symbol. Symbols are for elements. |
| [-script]: written in small form below the level of normal letters or numbers. | Subscript: written in small form below the level of normal letters or numbers. |
| [-script]: written in small form above the level of normal letters or numbers. | Superscript: written in small form above the level of normal letters or numbers. |
| Sub- = [...] | Sub- = below |
| Super- = [...] | Super- = above |
| IMPORTANT: In a chemical formula, the numbers in subscript tell you how many of the element to the [...] are in the entire molecule. | IMPORTANT: In a chemical formula, the numbers in subscript tell you how many of the element to the left are in the entire molecule. |
| IMPORTANT: In a chemical formula, the numbers that are NOT in subscript and are found to the [...] of the entire molecular formula tell us how many molecules there are. | IMPORTANT: In a chemical formula, the numbers that are NOT in subscript and are found to the LEFT of the entire molecular formula tell us how many molecules there are. |
| In a chemical formula, sometimes there are numbers to the left that tell you how many of the entire molecule there are... those numbers are called [c-s]. | In a chemical formula, sometimes there are numbers to the left that tell you how many of the entire molecule there are... those numbers are called coefficients. |
Created by:
mr.shapard
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