Melting and Boiling Points: The particles/substances which are present in a metal are held or joined together by strong metallic bonds. A lot of energy is used to separate these particles. That is why metals have high melting and boiling point. Metals are solid as well as crystalline.…
Ionic bonds compare with covalent bonds, because covalent bonds are stronger that ionic bonds. Ionic bonds are formed by the attraction of an anion and a cation. A covalent bond is formed by the sharing of valence electrons. 12. Hydrogen bonds are interactions between positive poles and negative poles of polar molecules for example like water.…
Discussion There were four goals for Project 11: Identification, Properties, and Synthesis of an Unknown Ionic Compound. The first goal was to identify the unknown compound, the second goal was to determine the reactivity of the compound, the third goal was to determine the quantitative solubility of the compound in water, and the fourth goal was to find the percent yield of a product from a reaction involving the unknown compound. Determining the identity of the unknown compound was achieved by performing a variety of tests for the physical properties of the substance. Some of these properties, such as melting point and chemical structure, could be discovered by making a few immediate observations of the substance. The unknown compound…
Materials. Numerous substances in the experiment were used. The most frequently used was the unknown due to the need to test its physical and chemical qualities. When a solution of the unknown was made, 1.000 g of the unknown and 1.0 mL of water was used to make it. To test for the possible ions, 1.0 mL of silver nitrate and 1.0 mL of nitric acid were used for the ion test.…
Parana Pine: For the Parana Pine I obtained the published value from a website since the values on the lab sheet didn’t have a values for Parana Pine. Firstly, I calculated my own Young’s Modulus Value with the result got from the tests using the equation for Young’s Modulus in Bending: E= l³/(4bd^3 ) x ( Δw)/( Δx) From using this equation, I achieved 14.44 E/GPa as a value, the published value, was: 11.37 E/GPa found on ‘The Wood Database’. The difference between my results and the Published values is: 3.07, and it was still within the range of the published value. Regarding the accuracy of the test, since this was my first time conducting this type of test, there may have been some mistakes I made that could have affected the results…
Experiment 5: Separating Ferrocene and Acetylferrocene by Adsorption Column Chromatography AIM The primary goal of this experiment is to separate ferrocene and acetylferrocene using adsorption column chromatography. Additionally, a dry pack method with a micro scale column will be implemented, and the percent recovery for each compound will be computed. TABLE OF PHYSICAL PROPERTIES AND HAZARDS WITH STRUCTURES Ferrocene: - Physical Property: Solid Molecular Weight: 186.04 g/mole Boiling Point: 249 °C Melting Point: 173.5 °…
The attraction that holds the oppositely charged ions together in the ionic compound is called an ionic bond. Ionic compounds are hard, brittle solids with high melting points. Most ionic compounds are also electrolytes, which are compounds that separate into ions when they dissolve in water, producing solutions that conduct electricity. In addition, most ionic compounds form three-dimensional crystals, in which many of each kind of ion in a fixed ration are held together by their ionic bonds. Sodium hydroxide is an ionic compound, which sodium is the metal cation (Na+), and hydroxide is the non-metal anion (OH-), more specifically, sodium Hydroxide’s hydroxide is a polyatomic ion, an ion made up of more than one atom that acts as a single particle.…
Given an unknown compound in container 3, solubility tests, cation tests, anion tests, and conductivity tests can be used to determine the various properties of the unknown to then make a positive identification of the unknown. These results will not only show chemical and physical properties but also what the unknown compound might react with to form other compounds. After performing the four anion tests, a positive identification was able to be made showing that the unknown compound contained a chloride ion since a white precipitate was formed from the reaction (Table 1). The sulfate, nitrate, and carbonate tests all yielded negative results when no precipitate was formed. The reaction of the chloride anion is as follows: Cl-…
Answer the following questions. You may use the periodic table in the Chemistry: Problems and Solutions book for this test. When you have finished, submit this assignment to your teacher by the due date for full credit. (5 points) Score 1. Pentane gas (C5H12) combusts with oxygen gas (O2) to form water (H2O) and carbon dioxide (CO2).…
Was there a difference in the conductivity of solid NaCl and of the 0.1 M NaCl solution and if yes, why? Yes, there was a difference in the conductivity of solid NaCl and of the 0.1M NaCl because NaCl needs to be dissociated in water to conduct electricity. Solid NaCl is not dissociated therefore, it did not conduct electricity whereas 0.1M NaCl solution did. A3.…
A compound is defined as a chemical combination of two or more elements. A chemical bond is the “glue” holding together atoms of different elements. Two types of bonds are ionic and covalent. Ionic bonds generally occur between a metallic atom and a nonmetallic atom. The bond results from the transfer of one or more electrons from the metallic atom to the nonmetallic atom, resulting in a charge difference.…
This lab was conducted to find the key differences between the quantity of heat (q) and ∆H of a substance. Different masses of substances CaCl2 and NH4NO3 were dissolved in water to see how changing mass impacts the q and ∆H of a substance. When the two substances dissolve, they become ions. CaCl2 dissolves in a reaction of: CaCl2 Ca2+aq + 2Cl1-aq while NH4NO3 dissolve in a reaction of: NH4NO3 NH41+aq + NO31-aq . As shown in these reactions, when ionic compounds dissolve in water, they break into their individual charged ions.…
My group had been given a specific task to investigate according to the lab manual1. We were employed by the Environmental Protection Agency as chemists. Our task is to identify an unknown compound that was found in a nearby landfill. In this laboratory, the unknown compound was given to us by our TA. The main goal of this experiment was to correctly identify the unknown compound.…
It only happens between non-metal atoms. Ionic bonding involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds. Atoms turn into ions when they lose or gain electrons. Since the atoms are particles in the matter,…
The Calorimetric Determination of Enthalpy and Entropy Changes of the Thermal Decomposition of Sodium Sulphate Decahydrate Abstract Sodium sulphate decahydrate thermally decomposes to anhydrous sodium sulphate at 50⁰ C and cools to form anhydrous sodium sulphate. Using Hess's Law the enthalpy and entropy changes of this process can be determined in order to deduce the spontaneity of the reaction. The transition temperature was determined by melting the hydrated crystals at 50⁰ C and allowing them to cool until a constant temperature was reached. The molar enthalpy and molar entropy changes were determined using calorimetric principles. Different weights of both decahydrate and anhydrous crystals were added to water and the temperature changes…