My Chemistry Coloring book: Colouring for adults, cells, neurons, bacteria illustrations

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Choose a stencil pattern and colour-in the dots using a selection of colours, or design your own using a series of dots.

Students are tasked with using the periodic table to find out which group each element is in, which acts as a key for the colours. We are going to use chromatography to separate these different food colourings into the coloured pigments they are made from. This makes revising groups and elements a fun an engaging task, as well as helping tie it into Christmas Jumper Day with a festive twist.

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where ν(the Greek letter ‘ nu’) is frequency in s -1. Visible red light with a wavelength of 700 nm, for example, has a frequency of 4.29 x 10 14 Hz, and an energy of 40.9 kcal per mole of photons. The full range of electromagnetic radiation wavelengths is referred to as the electromagnetic spectrum. Because electromagnetic radiation travels at a constant speed, each wavelength corresponds to a given frequency, which is the number of times per second that a crest passes a given point. Longer waves have lower frequencies, and shorter waves have higher frequencies. Frequency is commonly reported in hertz (Hz), meaning ‘cycles per second’, or ‘waves per second’. The standard unit for frequency is s -1. You will notice that the paper absorbs the water and it rises up the chromatography paper past the spots of food colouring. When the water reaches the spots, the pigments will dissolve in the water and move up the paper.

Jason Chari, Creator of VRChem and the O-Chem (Re)Activity Book / Contributor to QRChem / Student, UCLA Place a small spot of the coloured mixture you are investigating onto the pencil line and allow it to dry. The activity shows children how chromatography can be used as a separation technique – in this case as a way of separating mixtures of dyes and colours. Practical considerations Dip your finger in the cup of cold tap water to get a drop on the end and let it fall onto one of the coloured dots. Francesca Ippoliti, Creator of RSChemistry, VRChem, and the O-Chem (Re)Activity Book / Contributor to QRChem / Student, UCLACelebrate Save the Childrens' Christmas Jumper Day with this Christmas Colour by Symbols: Elements activity newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\) Just like ocean waves, electromagnetic waves travel in a defined direction. While the speed of ocean waves can vary, however, the speed of electromagnetic waves – commonly referred to as the speed of light – is essentially a constant, approximately 300 million meters per second. This is true whether we are talking about gamma radiation or visible light. Obviously, there is a big difference between these two types of waves – we are surrounded by the latter for more than half of our time on earth, whereas we hopefully never become exposed to the former to any significant degree. The different properties of the various types of electromagnetic radiation are due to differences in their wavelengths, and the corresponding differences in their energies: shorter wavelengths correspond to higher energy. In a spectroscopy experiment, electromagnetic radiation of a specified range of wavelengths is allowed to pass through a sample containing a compound of interest. The sample molecules absorb energy from some of the wavelengths, and as a result jump from a low energy ‘ground state’ to some higher energy ‘excited state’. Other wavelengths are not absorbed by the sample molecule, so they pass on through. A detector on the other side of the sample records which wavelengths were absorbed, and to what extent they were absorbed.