k Zn(C2H3O2)2 l Total atoms Na2SO4 c / 24 H2O b 2 marks for each correct row 6 C6H12O6 2 Describe what the following chemical symbols and formulae represent. Symbol or formulae a OH1- b Polyatomic ion (hydroxide). One atom of oxygen bonded to one atom of hydrogen‚ with an overall charge of –1. 2 marks for each correct answer 3 CaCl2 d / 6 CO2 c Description Al(NO3)3 TOTAL / 30 16 Quick Science Tests – Chemistry
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but don’t have them memorized • Read the oxidation states (charges) on the periodic table However‚ you should assume that they have no knowledge on ionic and covalent bonds‚ criss‐cross rule‚ prefixes‚ acids‚ and adding or subtracting oxygen atoms from polyatomic ions. Instructions: • Use only yes/no type of question (there must be two answers‐ yes or no). • • • • • Questions must relate to the compound name Start by asking a single general question that divides the compounds into two categories Contin
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Name : Dania Annuar Class : M11G Title : Determination of Chloride in Urine in Different Circumstances Aim: To determine the chloride content by titrating mixtures of urine against potassium thiocyanate under in different circumstances. Research Question: How do different conditions of urine samples collected affect its concentration of chloride which is measured by titrating the mixture of urine with potassium thiocyanate until it turns red? Hypothesis: The greater the consumption
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the less water present. Female facing forward 40% 4. List the three fluid compartments and the percentage of total body water in each. a. Intracellular 62% b. Interstitial 30% c. Plasma 8% 5. Give an example of each of the following solutes: a. Ions/electrolytes Sodium b. Colloids Proteins c. Nonelectrolytes Glucose 6. List the major extracellular and intracellular cations and anions a. Extracellular cations: Sodium‚ Potassium‚ Calcium and Magnesium anions: Bicarbonate‚ Sulfate‚ Protein
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LEARNING TASK NO. 4B Composition Stoichiometry Problems Mole Relationship from Chemical Formulas: a) Determine the number of moles of chloride ions in 2.53 mol ZnCl2. b) Calculate the number of moles of each element in 1.25 mol glucose (C6H12O6). c) How many molecules of oxygen atoms are present in 5.00 mol diphosphorus pentoxide? d) Calculate the number of moles of hydrogen atoms in 11.5 mol water. e) A sample of ethanol (C2H5OH) has a mass of 45.6 g.How many carbon atoms does the sample
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Pre-Lab Discussion An empirical formula is a formula for a chemical compound found by direct laboratory examination. Laboratory procedures allow the chemist to find the simplest whole number ratio of elements within the compound. In order to find the true molecular formula‚ the chemist also needs to know the compound’s molecular mass. The general procedure is to use laboratory techniques to determine the mass of each element in the compound. In this lab‚ we will react a known quantity of magnesium
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be reported as: 15.26 15.26 × 100 1.526 × 10 152.6 × 10-1 8 - A quantity of 5.44 mg of a substance can be expressed in scientific notation as: 5.44 × 10-3 g 5.4 × 100 g (544/100) mg 0.54 × 10 mg 9 - Pure tin is classified as: An ion An element A compound A molecule 10 - Element with an atomic number of 14 is a: Metal Non-metal Metalloid None of the above 11 - Anions are formed by the: Gain of electrons Loss of electrons Loss of neutrons Gain of protons
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Biology 113 Review sheet Chapter 2: * What is a compound and how is it different than an element? Compound is more than one element. An element cannot be broken down by chem. Rxns. * What are the 4 main elements of life? Why? C‚H‚O‚N they make up 96% of living matter and they are found in all of the major macromolecules * Be able to calculate the number of protons‚ neutrons and electrons given an element’s mass number or atomic number. If given this symbol - 4He – can you tell
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a future experiment will have to be conducted because there is not enough evidence to fully conclude what Red #2 is based off of the four experiments conducted. Since we know that Red #2 is ionic‚ we know that a precipitate will form if a certain ion is added to the solution and they are not soluble. A future experiment that can be performed to try and identify this red solution is to obtain 50 mL of red solution #2‚ a graduated cylinder‚ ten 50 mL beakers‚ a scale‚ a stir bar‚ and different elements
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Ocean County College Department of Chemistry Identification of Metallic Ions Purpose: The purpose of this lab exercise was to perform and observe the flame tests of some alkali and alkaline earth metal ions. When electrons in metallic ions are grounded‚ their configuration is stable. In other words‚ the loosely bound electrons in the valence shell of the atom are satisfied at their “low” energy state. They do not require to be balanced by emitting any type of radiation or receiving any
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