b. Questions: 9. As in any equation, the elements on the left side of the equation (the reactants) must equal the elements on the right (the products). Converting from one unit of measurement to another is a basic scientific skill. An electron configuration is a description of the relative locations of electrons in an atom or ion. d. Endothermic, greater, exothermic, less. Notice that putting an electron in a 3d orbital takes more energy than putting one in a 4s orbital, because 3d orbitals are more complex. 2. When answering the questions, remember that the molecular mass of a molecule is the total mass of all the atoms making up the molecule. About Covered topics include simplest and molecular formulas, mass percent composition, and naming compounds. Electrons conserve energy so that the lowest-energy level orbitals fill first. A mixture is homogeneous, and the properties of its components are retained, while a compound is heterogeneous and its properties are distinct from those of the elements combined in its formation. NAIT was willing to accept me as a student provided that I had acceptable grades in the core subjects required for my course, and so the funding agency only paid for those courses. License our Content I am considering challenging the GED exam in Alberta because despite having graduated from Chemical Technology at NAIT with honours, some employers seem to think that my skills are sub-par just because I never graduated high school and was not permitted to do a GED when I upgraded to take my post secondary education because I was on a grant. I can explain this to you. Chemical changes involve the alteration of both a substance’s composition and structure. The weight of a body varies according to the force of gravity exerted on the body. When using the scientific notation system to express large numbers, move the decimal point until only two digits remain to the left, then indicate the number of moves of the decimal point as the exponent of 10. Change in hydration. B Temperature conversions are common calculations in chemistry. Contact Us The empirical formula of a compound represents the simplest whole number ratio between the elements that make up the compound. This practice test deals with finding empirical formulas of chemical compounds. In an Endothermic reaction, the heat content of the products is greater than the heat content of the reactants, while in an exothermic reaction, the heat content of the products is less than the heat content of the reactants. Unchanged chemical formulas: Most importantly, never alter a chemical formula! 4. Change in … The basic measurement of concentration in chemistry is molarity. b. Endothermic, less, exothermic, greater C By the way, stoichiometry works for the 1:1 ratio questions, too; it just takes one or two more steps. https://www.thoughtco.com/printable-chemistry-worksheets-609242 This Cheat Sheet provides some basic formulas, techniques, and tips you can refer to regularly to make solving chemistry problems a breeze (well, maybe not a breeze, but definitely easier). Number, unit — it’s like having a first and last name. You can generally check your work by adding up all the superscripts to make sure that you have the right number of electrons. D The Ideal Gas Law is the relationship described by the equation: where P is pressure, V is volume, n is the number of moles of an ideal gas, R is the ideal gas constant and T is the temperature. c. When using the scientific notation system to express large numbers, move the decimal until only three digits remain to the left, then indicate the number of moves of the decimal point as the exponent of 10. Note that the molecular mass or molecular weight is the total mass of a compound. The equation E = mc2 is based on the ______________________, and states that ______equals _____ times the _____________2. a. c. Change in heat content Each exam has answers supplied at the end. You move the decimal place to the left until only one digit is to the left of the decimal point, and indicate the number of moves using a power of 10.
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