Mole

Introduction The purpose today’s experiment was to test out the concepts of moles, mass, and atoms by separating two metals. The galvanized iron was measured to two decimal places in centimeters then weighed for mass to three decimal places in grams. The galvanized iron was then stripped of it’s layer of zinc by using hydrochloric acid. The chemical reaction of the experiment is shown below: 2 HCl (aq) + Zn(s)----> H2 (g) + Zn2+(aq) + 2 Cl-(aq) Once the iron was free of the zinc…

In some questions, the number of moles of the chemicals are given asking it easier for students or making it one less step for them to do. But if it’s not given students must change the amount of the substances into moles. Find the ratio of the substances using the number of moles of them. For example : Na + Cl ----> NaCl the ratio here is 1:1, it all depends on the coefficients in front of the chemicals. Using the ratio calculated, change the number of moles of the unknown of the products…

Task 1 and 2 First ionisation energy – The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce one mole of gaseous ions each with a charge of +1. The first ionisation decreases as you go down a group. This is because the electrons are getting further away from the nucleus meaning it is easier to remove the outer electron. There is also less shielding thus allowing the outer electron to be removed much more easily. As…

expressed as:PV/T=R in which R us the constant value of the ratio. This equation is made considering only 1 mole [like one gram molecular weight] of ideal gas. If n moles of a gas were to be considered then it would be PV=nRT which is known as the general ideal gas law. R will be the molar gas constant and can be used in many different units depending on the application:8.314 J/K/mole, 0.08205 L atm/mole and 1.987mole. The relevance of the gas laws to aerosol cans can be seen in the following…

Skin cancer is a major skin disorder that heavily effects the human body from the integumentary system to the immune system. There are three main types of skin cancer that is caused by the abnormal growth of cells within the skin. There is the basal cell carcinoma that starts off in the basal cells, squamous cell carcinoma that forms in the epidermis, and the malignant melanoma which happens when the melanin has become cancerous. Many people around the world have been diagnosed with one of these…

molality (m), number of moles of the solute per kg of solvent, by dividing ΔTf by kf. The molal freezing point depression constant, kf, is given to us for cyclohexanol at 39.4°C/m, and the ΔTf was determined experimentally using Logger Pro. Once we have that molality, we can then find the moles of solute used by multiplying the molality by the solvent used in kg. Finally, we can determine the molar mass by dividing the solute in grams added to the cyclohexanol by the moles of the solute…

reacting. Mr. Kivimaki stated, “The stoichiometry of my reaction (or any reaction) will allow you to predict the amount of product (CO2) based on the amounts of the reactant. So if one knows the amount of moles for baking soda and the amount of moles for vinegar, you can predict the amount of moles for CO2 produced. Then the molar amount can then be converted to volume of gas.” Those were some of the things that I researched to get a better understanding on my…

Today I am going to be writing to you about the Integumentary system. Integumentary system is the organ system that protects the body from damage. The system includes skin, nails, skin derivatives hair and glands. The integument is the largest system of the body. It includes 16% of our body weight. It is made up of two parts cutaneous membrane and accessory structures. The accessory structures include hair, nails and exocrine glands. Cutaneous membrane is the epidermis and papillary layer of the…

Moles , sores , lumps ,previous sun exposure,history in family of pancreatic cancer or astrocytoma, history in family of melanoma,history in family of irregular , prominent moles, or any other changes that you may notice to your skin or feels like it could be malignant melanoma are signs and symptoms that you may have malignant melanoma and…

You have recently reached out to our firm Nittany Chemical Analysis to assist you in assigning the correct empirical formula for Manganese ( ) Chloride. On the 14th of September 2015, we carried out an experiment and we were able to accurately determine that manganese had an oxidation number of III. From this finding we are confident that the empirical formula for the compound in question is Manganese (III) Chloride. Throughout the entire course of this letter, we will further explain our…