1:14 know what is meant by the terms atom and molecule.1:13 practical: investigate paper chromatography using inks/food colourings.
DIFFERENCE BETWEEN ATOM AND MOLECULE IN TABULAR FORM HOW TO
1:12 understand how to use the calculation of Rf values to identify the components of a mixture.1:11 understand how a chromatogram provides information about the composition of a mixture.1:10 describe these experimental techniques for the separation of mixtures: simple distillation, fractional distillation, filtration, crystallisation, paper chromatography.1:09 understand that a pure substance has a fixed melting and boiling point, but that a mixture may melt or boil over a range of temperatures.1:08 understand how to classify a substance as an element, a compound or a mixture.1:07 (Triple only) practical: investigate the solubility of a solid in water at a specific temperature.1:06 (Triple only) understand how to plot and interpret solubility curves.1:05 (Triple only) know what is meant by the term solubility in the units g per 100g of solvent.1:04 know what is meant by the terms: solvent, solute, solution, saturated solution.1:03 understand how the results of experiments involving the dilution of coloured solutions and diffusion of gases can be explained.1:02 understand the interconversions between the three states of matter in terms of: the names of the interconversions, how they are achieved and the changes in arrangement, movement and energy of the particles.1:01 understand the three states of matter in terms of the arrangement, movement and energy of the particles.But in solids the packing is very compact and hardly any movement to the molecules is allowed, giving the object a firm shape. In liquids, the packing is a bit more compact and so the particles are always together. In gases, the molecules are very loosely packed so that the molecules can flow around easily without colliding. The composition and density levels vary the thickness and form of the objects. The bonding depends on the charge and chemical properties of the atoms.Ītoms and molecules are present in all objects and living things. Thus it becomes stable and forms a molecule.
The sufficient number of electrons are received in an atom, when two atoms bond together and share the electrons. Only when sufficient number of electrons are present in an atom, it becomes stable. This is owing to the presence of electrons in the atoms.
But when similar molecules combine together in any numbers, a simple product is formed.Ī molecule is usually stable to exist by itself but an atom is not stable by itself. So another difference between atoms and molecules is that when similar atoms combine together in varying numbers, molecules of different properties can be formed. But when three oxygen atoms combine to form an O3 molecule, it becomes Ozone. For example, when two atoms of oxygen combine to form a molecule, it becomes O2 which is the oxygen we breathe in. When atoms combine in different numbers to form a molecule, the end result can vary. Since atoms exist independently, there is no bonding in an atom. When these charged atoms bond together to form molecules, the bonds are formed by the electrons filling up the outer orbits of the atoms. Depending on the majority of the particles, the atom can be positively or negatively charged. The nucleus contains electrons and positively charged protons. The electrons are negatively charged particles. In a molecule, atoms are bonded together by single, double, or triple bonds.Īn atom has a nucleus surrounded by electrons. So a water molecule can be further divided into oxygen and hydrogen atoms. Each water molecule is made up of one oxygen atom and two hydrogen atoms. Water is comprised of numerous water molecules. Molecules also are not visible to the naked eye, while can be seen through highly magnifying microscopes and other scientific devices. The atoms are bonded together in a molecule. Unlike atoms, molecules can be subdivided to individual atoms. Molecules are formed by the combination of two or more atoms. For example the atoms of element gold cannot be broken down further and each atom has the properties of gold. Atoms are not visible to the naked eye and are the basic building blocks. It is not possible to breakdown the atom further retaining the properties of the element.
An atom is smallest particle in an element that has the properties of the element.
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