1. Sodium and potassium are the most frequently ecountered alkali metals‚ though rarely as the metal. Why these elements are rarely found as the metal? (Refer to the relative measurements tabulated in the form of electronegativities‚ ionization energies‚ or reduction potentials). These are due to the fact that their outer most orbital (ns1 valence electron configuration) has tendency to lose electron very easily and make stable configuration. The single valence electron is relatively far from the
Premium Oxygen Water Chemistry
Which combinations of substances resulted in a chemical change? Answer: The potassium nitrate and the ammounuiam hydroxide had a chemical change. It started bubbling and getting really foggy. The calcium nitrate and ammonuiam hydroxide did nothing. It’s all clear still‚ but no chemical change. The copper nitrate and ammonuiam hydroxide turned a bluish color so that had a chemical change. (5 points) Score 2. For each metal that participated in a chemical change‚ write the type of metal it is‚ based
Free Chemistry Chemical element Zinc
Given the unknown colourless liquid it is essential that the structure is derived. Firstly it is important to determine the percentage composition of elements to work out the empirical formula. The empirical formula was found to be C10H12O and the mass of the unknown was 148.09 m/z which when calculating the molecular weight of the empirical formula it did equal 148.09 g mol -1. This means that the empirical formula is also the molecular formula. As 12.01x10 carbons +1.008x12 hydrogens + 16= 148
Premium Chemistry Oxygen Molecule
name‚ and atomic mass of the element that has 18 protons in the nucleus of its atoms? Symbol= Ar (Argon) mass= 39.948g 10. Explain what is meant by the term atomic mass. Atomic mass is the weight of protons and neutrons combined in an element 14. How many electrons are there in the neutral atoms of the elements listed in Question 13? Helium= 2 Oxygen= 8 Sodium=11 Magnesium= 12 Chlorine=17 Sulfur= 16 16. Fill in the following table: Element Mass Number
Premium Water Sulfur Magnesium
usually produced by slow heating of wood or other substances in the absence of oxygen. Adsorb - is the adhesion of atoms‚ ions‚ or molecules from a gas‚ liquid‚ or dissolved solid to a surface. Carbon - is a chemical element‚ all known life on Earth is made from it. It is the only element that can form long chain-shaped molecules. Muffler - is a
Premium Oxygen Internal combustion engine Atom
Nuclear Beauty: The Uranium Story Uranium one of about 118 elements on our great periodic table. It is the 92nd element in the Periodic Tale and it can be found on the last group on the periodic table‚ or period 7. Its element symbol is U‚ with an atomic mass of 92; A Molar Mass of 238.028910‚ and 92 electrons as well as protons and a total of 6 valance electrons. Its melting point is 2‚070 degrees Fahrenheit (1‚132 degrees Celsius‚ or 1405.372 K) and with a boiling point of 7‚468 degrees Fahrenheit
Premium Nuclear fission Uranium Nuclear power
energy levels through the use of given elemental substances. With heat supplying a large amount of energy‚ the properties of the elements caused them to give off a certain color or tone of the light spectrum. Materials: Several materials were needed for the conduction of this experiment. Bunsen burners were used to generate heat. The process also required elements in liquid state‚ LiCl‚ NaCl‚ KCl‚ CaCl2‚ SrCl2‚ CuCl2‚ BaCl2‚ nichrome wire(or remove a pre-soaked wood splint)‚ small test tubes
Premium Chemistry Photon Atom
the plant parts fall off and start to deteriorate‚ the nutrient gets into the water and spreads to the other plants and water wildlife. For the most part‚ having phosphorus in the water is not good. This would probably mean that some other bad chemical polluted the water. Phosphorus in the water causes plants to die off and bacteria to form. This will cut off the oxygen supply and make it harder for plants and animals to
Premium Chemical element Chemistry Atom
Families of elements—Nonmetals 1. Chemical properties of the halogen family are that the halogens are located in Group VIIA of the periodic table‚ and are a class of nonmetals. The halogen elements are fluorine‚ chlorine‚ bromine‚ iodine‚ astatine‚ and ununseptium. These nonmetals are reactive and have seven valence electrons. 2. Halogens are located in Group VIIA which means they have seven valance electrons. One short from an octet. 3. Similarities with almost all solutions except for Test tube
Premium Periodic table Chemical element
representative soil samples from Patancheru industrial area near Hyderabad‚ Andhra Pradesh. It is a known polluted area and is one of the most contaminated regions where about 260 small and large-scale manufacturers of pharmaceuticals‚ paints‚ pesticides‚ chemicals‚ steel and metallic products have been functioning for over several decades. Toxic trace metal geochemical studies were carried out in fifteen representative soil samples collected from residential and agricultural area‚ to understand the spatial
Premium Soil Chemical element Copper