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Mixtures, Elements,
Study Tool For Mixtures, Elements, and Compounds
| Question | Answer |
|---|---|
| What is one way that scientists classify matter? | Composition |
| What can all matter be classified as? | Mixtures, elements, or compounds. |
| What are mixtures? | Two or more substances that are not chemically combined with each other and can be separated by physical means. |
| What do substances in a mixture retain? | Their individual properties. |
| What are solutions? | A special kind of mixture where one substances dissolves in another. |
| What are the two types of solutions? | Solutes and solvents. |
| What is the universal solvent? | Water |
| What are elements? | The simplest form of pure substances. |
| How can elements be broken or changed into something else? | They cannot be broken into anything else by physical or chemical means. |
| What are compounds? | Pure substances that are the unions of two or more elements |
| What and how can compounds be broken into? | They can be broken into simpler substances by chemical means. |
| What is a compound if it is not uniform throughout? | It is a heterogeneous mixture? |
| What is a heterogeneous mixture considered? | It is considered the "least mixed". |
| What is special about a heterogeneous mixture? | It is not the same throughout. |
| What is special about the particles in a heterogeneous mixture? | The particals are large enough to be seen and to be separated from the mixture. |
| What are examples of heterogeneous mixtures? | Sand, pebbles, oil, and water. |
| What is a mixture that is uniform throughout? | A homogeneous mixture. |
| Is a homogeneous mixture, well mixed or less mixed? | Well mixed. |
| What are the particals like in a homogeneous mixture? | The particals are very small and not easily recognizable. |
| What is a solution? | A homogeneous mixture formed when one substance dissolved in another. |
| What are elements? | The simplest pure substance. |
| Can an element be changed into a simpler substance? | An element can not be changed into a simpler substance by heating or any chemical process. |
| What is the smallest part of an element? | An atom. |
| When elements combine, what do they create? | A compound. |
| What are atoms of the same element? | Alike. |
| What are atoms of a different element? | Different. |
| When was it created and what is the periodic table? | In 1813, a system of representing elements with symbols was introduced. |
| What does each symbol consist of? | One or two letters. |
| When are two letters needed for an element? | When the first letter of that element's name has already been used. |
| What is sodium's letters? | Na |
| What is chlorine's letters? | Cl |
| What is hydrogen's letter? | H |
| What is oxygen's letter? | O |
| What is carbon's letter? | C |
| What is nitrogen's letter? | N |
| What are compounds also? | Pure substances. |
| Why is water a compound? | Because it can be broken down into simpler substances- Oxygen and Hydrogen. |
| How are chemical formulas constructed? | They are used by using the first letter of an element and it's subscript. |
| What do subscripts show/represent in a chemical formula? | The number of atomic elements. |
| Where is a subscript for a certain element located? | After the first element pertaining to the one before it. |
| What if there is no subscript…..what does that mean for the element? | It means that it has only one of that element. |
| What is salt's chemical formula? | NaCl |
| What is water's chemical formula? | H2O |
| What is sugar's chemical formula? | C6H12O6 |
| What is oxygen gas's chemical formula? | O2 |
| What is carbon dioxide's chemical formula? | CO2 |
| What is nitrogen gas's chemical formula? | N2 |
| What is the periodic table used for? | It is used to help people locate and understand the elements and what makes up things at the molecular level. |
| What are the horizontal rows on the periodic table called? | Periods. |
| What about the vertical rows on the periodic table? | Groups. |
| How many vertical rows are there on the periodic table? | 18 |
| Each vertical row has something in common; what does each vertical row share? | The same number of electron shells. |
| How are the elements on the periodic table arranged? | They are arranged in order of increasing atomic numbers. |
| What does the zigzag line on the periodic table mean? | It separates metals and nonmetals. |
| What are metals according to the periodic table? | They are a major classification on the periodic table. |
| Where are they located on the periodic table? | They are located on the left side for the periodic table. |
| What are nonmetals according to the periodic table? | A major classification of elements generally located on the right side of the zigzag line on the period. |
| Where are they located on the periodic table? | Generally located on the left side of the zigzag line on the periodic table. |
| What are metal's specific properties? | Luster, conductors, malleable, ductile, and high density. |
| What are nonmetal's specific properties? | Brittle, nonconductors, and dull. |
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