This chapter discusses the atoms, molecules, compounds, and mixtures. Atoms have been defined as the smallest parts of matter that cannot be changed by chemical means. In nature, the inert gases neon, argon, krypton, and xenon together with helium exist in nature as single uncombined atoms. ...
Atoms, elements, molecules, compounds and (原子、元素和分子化合物).pdf,Chemistry for the gifted and talented 1 Atoms, elements, molecules, compounds and mixtures Student worksheet: CDROM index 01SW Discussion of answers: CDROM index 01DA Topics Atoms,
Molecules Elements Periodic Table Natural elements Synthetic or man-made elements Compounds Mixtures Atoms An atom is a basic unit of matter that consists of a central nucleus surrounded by negatively charged electrons. The nucleus contains protons and neutrons. Electrons revolve around the nucleus in ...
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Some compounds are collections of positively and negatively charged atoms called ions. These are called ionic compounds. For molecular compounds, the smallest unit is the molecules. For ionic compounds, the smallest unit is the formula unit, which is the lowest whole number ration of the ions ...
书名Atoms, Molecules, and Compounds 作者Phillip Manning ISBN: 0791095347 128 pages 目录Meet the Atom 1 The Quantum Model 15 The Nucleus 29 The Electrons 42 The Elements 58 Chemical Reactions: Making Molecules 71 Chemical Bonds 81 Common Compounds, Uncommon Results 102 Periodic Table of the ...
Molecules, being composed of bonded atoms, can undergo chemical reactions as well. The nature of these reactions depends on the types of atoms involved and the bonds between them. Molecules can react to form new compounds, break apart into their constituent atoms, or rearrange their atomic compos...
2.3Atoms and molecules 2.3Atomsandmolecules Review Whatispuresubstance Apuresubstanceconsistsofonlyonesubstance.Whichoneispuresubstance?oxygenSodiumchloride Elements:substancesthatcannotbechemicallybrokendownintosimplersubstances.Compounds:puresubstancesmadefromtwoormore,elementschemicallycombined together.Elementsand...
How do atoms make molecules and compounds? Atoms are a bit like people: they usually prefer company to being alone. A lot of atoms prefer to join up with other atoms because they're more stable that way. So hydrogen atoms don't exist by themselves: instead, they pair up to make what...
2.3 Atoms and molecules Review What is pure substance A pure substance consists of only one substance. Which one is pure substance ? Sodium chloride oxygen Elements: substances that cannot be chemically broken down into simpler substances. Compounds : pure substances made from two or more ,elements...