Presentation on theme: "In this presentation you will:"— Presentation transcript:
1In this presentation you will: Distinguish between elements and compounds.Distinguish between pure substances and mixtures.ClassAct SRS enabled.
2By definition, matter is everything that has a mass and inertia, and occupies a place in space. It can be simply describe as the “substance” that all things are made of.The way trees, water, the air we breathe, etc. behave, depends on how this substance is formed and its properties.Next >
3States of MatterThe three states of matter are solid, liquid and gas. The states have both, visible and invisible properties.SolidsShape and volume are defined.LiquidsShape is undefined, but volume is defined.GasesShape and volume are undefined.Particles are in touch with each other and they form a pattern.Particles are in touch with each other, but they move freely.Particles are apart from each other, moving fast and randomly.Next >
4Question 1 Which one of the following correctly describes a solid? A) Defined shape and fixed volume.B) Undefined shape and variable volume.C) Undefined shape and defined volume.D) Defined shape and undefined volume.
5Question2In which state of the matter are particles moving and in touch with each other?A) Solid state.B) Liquid state.C) Gaseous state.D) All the states.
6Pure SubstancesEvery sample of matter is classified as a pure substance or as a mixture.A pure substance is a type of matter in which all samples have the same composition and the same properties.ElementsCompoundsPure SubstancesMixturesMatterPure substances are divided in: elements and compounds.Next >
7Elements and AtomsAn element is a substance that cannot be separated into simpler substances. For example, carbon.Jar containing carbonThe smallest particle that preserves the properties of the element is the atom.There is one different type of atom for each element.Carbon atomNext >
8Elements and Atoms There are over 100 of these elements. Most of them can be found naturally on Earth.Others are produced synthetically by nuclear reactions.Elements are indicated by symbols, often based on their Latin names. The convention is:The first letter of the symbol is always capitalized.The second and third letters, if any, are never capitalized.Next >
9Elements and Atoms Some elements include: Used in: Symbol Name Coins SodiumCoinsSaltRocketsJewelryFire / CombustionAgSilverAuGoldOOxygenHHydrogenNext >
10Question3Which one of the following can not be a symbol of an element?A) MnB) HC) aCD) Na
11Compounds and Molecules = Oxygen atomA compound is a substance that is composed of two or more elements chemically held together in fixed proportions. In this example we will look at water.= Hydrogen atom= Molecule of WaterCompound of WaterIn a compound, atoms are chemically combined forming molecules.Next >
12Common salt (sodium chloride) Compounds and MoleculesEach compound has a chemical formula indicating the proportions each element is combined.AmmoniaNH3WaterH2OCommon salt (sodium chloride)NaClOne nitrogen atom combined with three hydrogen atoms.Two hydrogen atoms combined with one oxygen atom.One sodium atom and one chloride atom.Next >
13Compounds and Molecules The properties of the compounds are different to those of the individual elements.For example, both Oxygen and Hydrogen are gases.But combined, they form water, which is a liquid.H2ONext >
14Question 4 Which one of the following is not a compound? A) Sodium Chloride: NaClB) Magnesium: MgC) Ammonia: NH3D) Water: H2O
15MixturesA mixture is the combination of two or more pure substances that do not chemically combine to form compounds.Pure SubstancesMatterElementsCompoundsMixturesHeterogeneousHomogeneousMixtures can be divided into homogeneous and heterogeneous.Next >
16MixturesSand and PebblesHeterogeneous mixtures are those that are not evenly distributed, the composition of one zone (or phase) is different to the composition of the other zone (or phase).BloodThe particles in a heterogeneous mixture are coarse enough to be distinguished by visual observation.Next >
17Mixtures Homogeneous mixtures are those that are evenly distributed. The components of a homogeneous mixture are combined together and are unable to be distinguished from one another by visual observation.Next >
18Separating MixturesThe components of a mixture usually can be separated by physical means.Basic strategies to separate mixtures:Transfer: add a new phase that collects some components from the mixture, but not others.Conversion: convert components of the mixture into other forms that are easy to isolate. For example to dry clothes, we convert the water into steam.Next >
19Question 5 Which one of the following is a mixture? A) water B) orange juiceC) vinegarD) salt
20Question6When using a paper filter to separate sand from water, we are applying a transfer strategy for separating mixtures. Is this true or false?Answer True or False.
21Question7When evaporating the water of wet clothes to obtain dry clothes, we are applying a transfer strategy for separating mixtures. Is this true or false?Answer True or False.
22Summary After completing this presentation you should be able to : Show knowledge and understanding of the properties of each of the three states of matter.Distinguish between elements and compounds.Distinguish between pure substances and mixtures.End >