Free essay Essay Examples

Medicines and drugs

A drug or medicine is a chemical that alters incoming sensory sensations, mood or emotions, or physiological state. Painkillers, hallucinogens and alcohols are examples of drugs and medicines that alter incoming sensory sensations. Prozac and alcohol alter mood or emotions Steroids, cigarettes and heart medicines alter physiological state, including consciousness, activity level or coordination. Drugs… View Article

A Balanced Chemical Equation by Experiment

Introduction The purpose is to use the mole relationships to prove the validity of the balanced chemical equation and that the final product of the experiment would confirm the balanced equation. The hypothesis made is that the experiment would in fact confirm the balanced equation. This is because, by balancing the equation two products that… View Article

Data Collection

* The Rough was excluded during the calculation of the mean as the rough was a trial to indicate the general whereabouts of the end point, which is inaccurate of the exact end point. Table 2. Observations collected during the experiment. Table contains observations which were recorded during each trial of the experiment. Trials Observations… View Article

Determining a substance by tritration

Aim: Using the procedures of a standard acid base titration lab, the goal of this experiment is identifying the amount of Calcium Carbonate (CaCO3) that is presented in a calcium carbonate substance presented by our teacher. Hypothesis: Due to any unknown substance that we encounter in the chemistry room, we must take serious precaution, as… View Article

Marie Curie: Radioactivity and X rays

Marie Curie was born Marie Sklodowska on November 7th, 1867. She was born in Warsaw, Poland (“Marie Curie – Biography” par 1). Curie received her education from local schools; but her knowledge of science from her father. She obtained “Licentiateships in Physics and the Mathematical Sciences” from Sorbonne University, in Paris (“Marie Curie – Biography”… View Article

Reactivity series for common metals experiment

Aim To see if a common metal is reactive or strong enough to replace/push out/displace another common metal from its liquid compound. Hypothesis My prediction will be: the most reactive metal shown by the reactivity series will show if the metal can displace or not the metal in the compound. For example my hypothesis in… View Article

Preparing Salts- IB Lab

Calcium chloride (CaCl2) has been manufactured for over 100 years. The salt is used in a variety of industrial and consumer products, and is supplied as flakes, pebbles, pellets, powders and solutions with varying concentrations. Calcium chloride dissociates easily in water to form Ca and Cl ions. Calcium is essential for the formation of skeletons,… View Article

Analysis of the Nitrogen Content of Lawn Fertiliser

Research Question: What is the percentage by mass of nitrogen (from the ammonium ion NH4+) in Bunnings Green Up brand of lawn fertilizer compared to the manufacturer’s specification of 12.3%? Aim: To determine the percentage by mass of available nitrogen, present as the ammonium ion, in Bunnings Green Up brand of lawn fertiliser, then comparing… View Article

Determination of the molar volume of hydrogen gas

Introduction We are going to determine the molar volume of hydrogen gas by letting known amount of magnesium react with dilute hydrochloric acid and carefully collecting the gas formed. Materials Gas syringe Hydrochloric acid, 2-molar 8 cm of magnesium ribbon Ruler Emery cloth For details see instruction form Methods We connect the equipment according to… View Article

Testing antacids

Purpose: The purpose of this investigation is to test different antacids – mild base that can neutralize acid – for their effectiveness in neutralizing stomach acids, to see if all antacid tablets are equally effective, and to learn the way of comparing antacid tablets in their acid- neutralizing ability to baking soda. Hypothesis/ Prediction: The… View Article

Investigation on finding the Molar Mass of Butane

Aim: To find the molar mass of butane, by finding the number of moles of gas in the container and comparing it to the mass of butane in the container Theory Butane (C4H10), also called n-butane, is the unbranched alkane with four carbon atoms, CH3CH2CH2CH3. Its only other isomer is methylpropane: CH(CH3)3. It is an… View Article

A group II metal hydroxide

To find the identity of X(OH)2 (a group II metal hydroxide) by determining it’s solubility from a titration with 0.05 mol dm-3 HCL Theory:1. Titrations are the reaction between an acid solution with an alkali. In this reaction (called neutralization), the acid donates a proton (H+) to the alkali (base). When the two solutions are… View Article

Properties of Hydrocarbons

Aim: To demonstrate that different classes of organic molecules undergo different characteristic reactions. Data Collection: Cyclohexane Toluene Cyclohexene Combustion – no sootiness – calm, bright flame – short burn – a lot of sootiness – strong, bright flame – long burn – medium sootiness – bright flame – short burn Solubility in distilled water –… View Article

Relating Moles to Coefficients of a Chemical Equation

Introduction: The definition of a mole is Avogadro’s number (6.02 x 1023) of particles (atoms, molecules, ions, electrons etc.). Moles are a very important part of chemistry especially in stoichiometry since it is part of many other calculation quantities and formulas including molar mass, solution calculations and gas volume calculations. The mole is also used… View Article