Learn more Solutions for Finding Value of Molecular Weight,Mass Percentage of NCERT They will only light if you strike them using the surface on the side of the box. For webquest or practice, print a copy of this quiz at the Chemistry: Chemical Reactions webquest print page. To give you enough time to move the match to whatever you wish to light, most matchsticks are treated with paraffin (candle wax). a. Which of the following is an anti-knocking compound, that has been phased out in many countries so far? Bunsen Burners, test-tubes filled with brightly coloured fluids, goggles and strange smells; this is the world of chemistry - at least to someone starting high school! A living organism is made elements and we were able to cover what makes up an element. If an atom contains 11 protons and 12 neutrons, its atomic number will be: 1 11 12 23. An atom is the smallest recognised division of a chemical element and is made up of three particles: the proton, neutron and electron. This looks like just the sort of thing my kids will love. [D]None of these [A]Nitrogen [B]Lead tetrachloride 4. Fast Fact: The group I metals are called 'alkali metals'; when they react with water they form an alkali solution. The Reactivity Series is grouped based on whether the metal reacts with oxygen, water and acids. A covalent bond is the result of: transferring electrons transferring protons sharing a proton sharing an electron . It was almost an I Love Lucy moment. Which among the following is the main constituent of Biogas? As I said in the forum - many of the ideas came from my fellow hubscribers so it is really a team effort! [D]Ethyl acetate It shows the metals in order with the most reactive at the top. Fast Fact: Nickel-Iron alloys are common in meteorites. (UI = Universal Indicator - a solution that changes colour depending on the pH of a substance. Explanation are given for understanding. Fast Fact: Diet coke works best because the surface tension in the drink is much lower than regular coke - this allows bubbles to form more easily. [C]Oxygen (NB: All numbers should be subscript). This is a process known as chemiluminescence: when the chemicals mix, electrons in the constituent atoms are raised to a higher energy level. Find helpful Chemistry questions and answers on Chegg.com. Fast Fact: The largest single firework to be set off was in Japan in 1988. [D]John Dalton Chemistry is a practical subject that is at the heart of our technological way of life. [B]Nitrate method If an atom gains or loses electrons, it is called an. Waterproof, no batteries needed, minimal heat & inexpensive. When you snap the stick, the glass vial breaks and the two chemicals mix and react. This damaging radiation is emitted by the Sun and is extremely dangerous. H = H – H is the formula used to determine a ______________. Chemistry is a practical subject that is at the heart of our technological way of life. Which among the following methods can be used to remove the permanent hardness in water due to calcium or magnesium. These both explode on contact with water. The different colours are created using different chemicals, and one of two different chemical reactions: incandescence (light created through heat) and luminescence (light without heat). [B]Ammonium nitrate I have a science experiment due in 3 weeks time that needs to prove or disprove something any ideas and it needs to be simple and easy. Which among the following is responsible for depletion of Ozone? Explain Thermal equilibrium. This allows the match to catch. If the temperature difference between the system and surroundings is zero then it is in Thermal Equilibrium. Fast Fact: Bee stings are acidic. [A]Calcium ammonium nitrate It was proposed in 1869 by Russian chemist, Dmitri Mendeleev. Basic Chemistry introduces students to the essential scientific and mathematical concepts of general chemistry. 3. The table shows the electrical charge and relative mass of the three major sub-atomic particles. Basic Chemistry Questions & Answers. This allowed him to predict what those undiscovered elements would be like. They can be neutralised using baking powder which contains sodium hydrogen carbonate - a base. $(function(){$("#butToggle5").click(function(){$('#dvt5').toggle(500);});}); Show Answer Under a microscope you can see that there are millions of tiny craters on the surface. By the way, if you have a hub on the scientific info about how ozone is created, I'd love to link it to a hub I just wrote about air pollution. I've written about ozone before, and I know a few things about some of what you mentioned, but I've never heard of the Coke thing, and I certainly didn't know how colors were produced in fireworks! Test-tubes, funny smells, explosions...the world of chemistry awaits! 4. The most reactive metals are the alkali metals - group I of the periodic table.