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Chapter four science
elements
| Question | Answer |
|---|---|
| What is a pure substance that cannot be seperated into a simpler substance by physical or chemical means? | An element |
| What type of substance has only one type of particle? | A pure substance |
| What two types of properties do characteristic properties include? | Physical and Chemical |
| Elements are classified by their properties. They are grouped into categories according to their ___________ properties | Shared |
| What are the three major categories of elements? | metals non-metals metalloids |
| What is an example of metals? | Iron |
| What is an example of metals | Copper |
| Metals are Malleable and _____________ | ductile |
| Metals are elements that are shiny and are good conductors of ___________ energy and electric current. | thermal |
| What is an element that is not shiny and is a poor conductor of thermal energy and electric current? | Nonmetals |
| What type of metals tend to be brittle and unmalliable? | Solid |
| What is an example of a nonmetal? | Graphite |
| What is an example of a nonmetal? | neon |
| What is another word for metalloids? | Semiconductors |
| What are elements that have properties of both metals and nonmetals (some are shiny and others are dull) | Metalloids |
| Solid, liquid, and gas are properties used to classify what? | Elements |
| What category of element would be the lease appropriate choice for making a container that can be dropped without shattering? | nonmetal |
| A _____________ is considered a pure substance because it is composed of only one particle. | compound |
| The particles of a compound are made of _________ of 2 or more elements that are chemically combined. | atoms |
| Compounds can be broken down by ________ changes, not physical changes. | chemical |
| What is a combination of two or more substances that are not chemically combined called? | a mixture |
| what is the process that uses the boiling point of components? | distillation |
| A ________ can be used to seperate some metals. | magnet |
| A centrifuge seperates mixtures according to the__________. | densities |
| Do the components of a mixture have a definite ratio? | No |
| ___________ are mixtures that appear to be a single substance but are composed of particles of two or more substances that are distrubuted evenly amongst each other. | Solutions |
| Solutions are often referred to as ________ mixtures because they have the same appearance throught the mixture. | homogeneous |
| What is the process in which particles of substances seperate and spread evenly throughout a mixture? | dissolving |
| In solutions, the _________ is the substance that is dissolved. | Solute |
| In solutions, the _________ is the substance in which the solute is dissolved. | solvent |
| What is a measurement of how much solute is dissolved in a solvent? | concentration |
| A solution that contains all the solute it can hold at a given temperature is ________. | saturated |
| The sollubility of most solids and liquids increase as the temperature gets ______ | higher |
| Methods that effect the speed at which solids dissolve are mixing, crushing, and _______ | heating |
| _________ are mixtures in which particles are dispersed throughout but are not heavy enough to settle out | colloids |
| A _______ has a defenite ration of components. | compound |
| A suspension can be seperate by what? | a suspension |
| A pure substance must be either a _________ or a compound. | element |
| Elements that are brittle and dull are ______ | nonmentals |
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