Introduction High performance liquid chromatography (HPLC) is used to separate compounds in a sample, identify compounds and can even be used to deduce the relative amounts of different compounds in a mixture. HPLC works under the same principle as thin layer chromatography using both a stationary and mobile phase. The mobile phase carries the mixture across the stationary phase which is used to separate the compounds. Although in HPLC mobile phase is tailor made to suit the polarity of the analytes. The mobile phase used in this particular experiment was Methanol and 0.1M sodium dihydrogen phosphate at a ratio of 30:70 and a pH of 4.5, slightly acidic.
- soluble gases mix homogeneously. Lesson 13.2 The intermolecular bond concept: vapor pressure, viscosity, and surface tension are determined by strength of molecular attraction. electrons in a nonpolar molecule are constantly shifting about. Dispersion force - temporary dipole attractions that can occur between nonpolar molecules. dispersion forces occur frequently for short periods of time.
This process is fractional distillation. c) Some properties of hydrocarbons depend on the size of their molecules. These properties influence how hydrocarbons are used as fuels. boiling points viscosity flammability. C1.4.3 Hydrocarbon fuels Additional guidance: a) Most fuels, including coal, contain carbon and/or hydrogen and may also contain some sulfur.
Mixture contains two or more different substances which are only physically bonded. 3. Is tap water a heterogeneous or homogenous mixture? Explain your answer. Heterogeneous, It contains ions, dissolved gases, bacteria, etc.
C) excess electrons. D) filled shells. E) lone pairs. 5. In forming covalent bonds where the octet rule is obeyed, sulfur usually forms ________ bonds and chlorine usually forms ________ bonds.
Hydrogen bonding linked the borax solution and PVA together. Introduction This lab focused on producing “Ghostbuster Slime,” made from mixing borax solution (sodium Borate) with polyvinyl alcohol (PVA) solution. The polymer was created as a result from cross-linking the two solutions. A polymer is a substance containing a molecular structure built by a very large number of similar units, or monomers, linked together. The linkage of polymers is a determining factor in the properties of a substance, such as solubility, elasticity, and viscosity.
Which include fats, oils, waxes, and cholesterol. They are mostly made up of long chains of monomers. Which is also known as fatty acids. Proteins are polymers made from monomers called amino acids. Which are building blocks of life.
Animal cells tend to have fewer and larger Golgi apparatus. Plant cells can contain as many as several hundred smaller versions. The Golgi apparatus receives proteins and lipids (fats) from the rough endoplasmic reticulum. It modifies some of them and sorts, concentrates and packs them into sealed droplets called vesicles. Depending on the contents these are despatched to one of three destinations: Cytoplasm-The cytoplasm consists of all of the contents outside of the nucleus and enclosed within the cell membrane of a cell.
BIOL-110 Elements of Biology Assignment 1 Student Name: Part A: Multiple Choice Questions and Fill in the Blanks 1) A covalent chemical bond is one in which * c) Outer-shell electrons of two atoms are shared 2) Which of the following is not a weak molecular interaction? * a) A covalent bond 3) Polysaccharides, lipids, and proteins are similar in that they * b) Are synthesized from monomers by dehydration reactions. 4) Which of the following is a compartment that often takes up much of the volume of a plant cell? * b) Vacuole 5) The presence of cholesterol in the plasma membranes of some animals * a) Enables the membrane to stay fluid more easily when cell temperature drops 6) Which of the following types of molecules are the major structural
Determination of Water Hardness by EDTA Titration Titration is a common laboratory method of chemical analysis that is used to determine the unknown concentration of a known reactant. Using a calibrated burette or pipette Many methods can be used to indicate the endpoint of a reaction; titrations often use visual indicators (the reactant mixture changes colour). Titration is a technique used in chemistry to measure the proportions of chemicals in a solution. It is a relatively simple process and a standard tool in any of the many branches of chemistry. Because of the versatility of the titration technique, many industries depend on various forms of titration to develop or analyze key chemical compounds.