Define an element, a compound, and a mixture. State the chemical symbols of elements. Describe the differences between elements and compounds. Deduce the formula of a compound from the ratio of elements present. Describe the differences between compounds and mixtures....
Compounds & mixtures课件 Elements,Molecules,Compounds&Mixtures ELEMENT •Consistsofonlyonekindofatom•Cannotbebrokendownintoa simplertypeofmatterbyphysicalorchemicalmeans•Canexistaseitheratoms(Argon)ORmolecules(Nitrogen)PROPERTYMeltingPointBoilingPointDensityLustreElectricalconductivity ELEMENTS METALS NON-METALS ...
Mixtures may be homogeneous or heterogeneous • The prefix “homo” indicates the same • Homogeneous mixtures have the same appearance and properties throughout the mixture • The prefix “hetero” indicates difference • Heterogeneous mixtures consist of visibly different substances ...
Elements, compounds and mixtures元素,化合物和混合物 Elements,compoundsandmixtures WHATISANELEMENT?Anelementis…•materialmadeofjustonetypeofatom •Asubstancethatcannotbeseparatedorbrokendownintosimplersubstancesbychemicalmeans Whatarethe3mostabundantelementsthatmakeuptheearth?•Oxygen•Iron•silicon answer...
Mixtures GOAL • To tell the difference between elements, compounds and mixtures and to give examples of each Matter • Matter is anything that has mass and takes up space. • Matter is made up of many different things: Substance
Science ActivitiesScience InstructionDescribes a model demonstrating the difference between mixtures and chemical compounds in which two different colors of clay are used to represent two different elements. Makes connections to real world situations. (YDS)doi:10.1080/00368120209601080...
Separating Mixtures Separation based upon differences in a compound’s solubility between two different solvents, typically immiscible liquids. Examples: gasoline (hydrocarbons) and water. Separation based upon differences a compound’s solubility in a solvent versus a stationary phase. Examples: paper chr...
The most widely employed group was alkaline agents, which, according to Table 3, together with composites and mixtures of agents, gave the best results. In contrast, metals, metal oxides, and acidic agents showed lower levels of DE-Cl, except when combined with alkaline agents [12,122]. Als...
The polyaminohydroxyl compounds in which the difference between the sum of amino groups plus hydroxyl groups plus inert groups and the sum of hydroxyl groups plus inert groups is 2+/-0.25 are particularly suitable for producing molded polyurethane articles by a RIM process. 展开 ...
9、NeutralAction of limewater(石灰水)Turns limewater milkyLimewater remains colourlessStructural (結構上的) difference between mixture and compoundmixture of carbonand oxygencompound ofcarbon dioxideDifferences between compound and mixture CompoundsMixture of elementsComposition(成份成份)constant compositione....