substances is called chemical equation. Example: In this equation‚ A and B are called reactants and C and D are called the products. Arrow shows the direction of chemical reaction. Condition‚ if any‚ is written generally above the arrow. When hydrogen reacts with oxygen‚ it gives water. This reaction can be represented by following chemical equation. In first equation words are used and in second symbols of substances are used to write the chemical equation. For convenience‚ symbol of substance
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early atmosphere - earth roughly 4 billion yrs old - created by volcanoes erupting + releasing gases - contained mostly co2 + water vapour - earth cooled + water vapour condensed to form oceans - co2 dissolved into oceans + used to form marine organism shells which were compacted to form sedimentary rock - plants evolved to photosynthesise‚ takingin co2 + releasing oxygen - scientists don’t kno where all nitrogen came from bc they weren’t there to record evidence but most theories suggest
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paper to remove this layer so that the underlying metal can be exposed into air. Question 2: Write the balanced equation for the following chemical reactions. (i) Hydrogen + Chlorine → Hydrogen chloride (ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (iii) Sodium + Water → Sodium hydroxide + Hydrogen Answer (i) (ii) (iii) Question 3: Write a balanced chemical equation with state symbols for the following reactions. (i) Solutions of barium chloride and sodium sulphate
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The universe is made up of 93.5% of Hydrogen atoms‚ 6.3% of Helium and 0.2% of other elements. By looking at the spectrum of hot stars‚ upper solar atmosphere and solar wind‚ an abundance of Helium is determined. Only from the 1920s there were methods of calculating what elements were present in a gas by just observing its spectrum‚ due to the fact that different elements absorb and emit different wavelengths of light. (2) Gamow thought that nuclear fusions took place in the first minutes after
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for the reaction conducted in this lab‚ including appropriate phase symbols. Mg(s) + 2HCl(aq) --> H2(g) + MgCl2(aq) 2. Determine the partial pressure of the hydrogen gas collected in the gas collection tube. The partial pressure of the hydrogen gas is 1.07 atm 3. Calculate the moles of hydrogen gas collected. pv=mrt ; n= .0013mol of hydrogen gas 4. If magnesium was the limiting reactant in this lab‚ calculate the theoretical yield of the gaseous product. Show all steps of your calculation. 0.03184
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Electrolysis a) Electrolysis is the decomposition of a substance to give simpler substances. The substance being electrolysed has to be an ionic compound. b) The substance being decomposed is called the electrolyte. c) In electrolysis the electric current enters and leaves the electrolyte by conducting rods called electrodes. The positive electrode is called the anode and the negative electrode is called the cathode. d) For electrolysis to occur the electrolyte must be in liquid form so that
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vary in length and shape. Hydrogen‚ nitrogen‚ and oxygen atoms are the most common atoms that are generally attached to the carbon atoms. Each carbon atom has 4 as its valence number which increases the complexity of the compounds that are formed. Since carbon atoms are able to create double and triple bonds with other atoms‚ it further also raises the likelihood for variation in the molecular make-up of organic compounds. [1] Carbon can also bond with itself and hydrogen to form both chains and rings
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If you are looking for instructions about building a lemon battery to light an LED‚ see Lemon Battery at Wikibooks. The lemon battery is a simple type of electrical battery that is commonly made for school science projects because it illustrates a battery’s main components. Typically‚ a piece of zinc metal and a piece of copper metal are inserted into a lemon. Everyday objects such as galvanized nails and copper pennies can be used for the zinc and for the copper. A single lemon is usually studied
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Week 2 Quiz Which of these is NOT one of the four general categories of cells that make up the human body? collagen cells muscle cell neuron connective tissue cell epithelial cells What is the term for the developmental process that leads to specialized cell types? homeostasis differentiation positive feedback genomics acclimatization If a person begins to sweat upon entering a hot room but continued sweating is able to keep the body temperature constant‚ which of these best
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valence electrons by two atoms‚ in contrast to the transfer of electrons in ionic bonds. Such bonds lead to stable molecules if they share electrons in such a way as to create a noble gas configuration for each atom. Hydrogen gas forms the simplest covalent bond in the diatomic hydrogen molecule. The halogens such as chlorine also exist as diatomic gases by forming covalent bonds. The nitrogen and oxygen which makes up the bulk of the atmosphere also exhibits covalent bonding in forming diatomic molecules
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