Measuring the enthalpy change of vaporisation of water You should attempt this part of the activity even if you have not seen the demonstration of the practical. 1. Calculate a value for ∆Hvap for water in KJ mol-1 using the data from the demonstration. Also‚ calculate ∆Hvap from the following data gathered by a student; 8100 J were needed to distil 2.95g of water. a) Explain why the boiling tube was surrounded with expanded polystyrene (or other similar insulation)‚ but the condenser was left
Premium Water Boiling Distillation
Determination of the Enthalpy for Decomposition of Hydrogen Peroxide Objective: To construct a coffee cup calorimeter‚ measure its calorimeter constant‚ and determine the enthalpy of decomposition and formation of hydrogen peroxide. Background: This experiment is a classic thermodynamics lab. In it‚ we attempt to measure the enthalpy (H) of a chemical reaction. The main obstacle is that this is a quantity that cannot be measured directly. It instead is observed as heat from one substance is transferred
Free Thermodynamics Energy Hydrogen peroxide
24-Hour Blood Pressure Monitoring In some patients‚ an elevated blood pressure reading taken during an office visit may not truly indicate hypertension—it could just be an occasional occurrence. These individuals are given a portable device to record their blood pressure over a 24-hour period. This helps us more accurately determine whether or not a patient usually has high blood pressure and requires treatment. Advanced Lipid Profile An advanced lipid profile test gives more information than
Premium Myocardial infarction Blood Hypertension
It’s a Tuesday. I’m finishing my workout at my neighborhood gym. I walk into the locker room‚ throw my clothes off‚ and head to the showers. The water is warm. I’m feeling like a real go-getter. The endorphins‚ the steam – it’s relaxing. Veeery relaxing. I take a handful of the shower gel that the gym supplies in buckets and start lathering up. I’m making sure things are clean down there. Really‚ really clean. (Not really‚ readers – I’m jerking off. Duh.) So I’m a showerbater; I admit it. I like
Premium Bathing Penis Semen
A pressure gauge is an instrument that measures the pressure in a vessel‚ a line‚ or whatever the pressure gauge is connected to. A Bourdon gauge consists of a C-shaped pipe with one end closed and the other end attached to a chamber whose pressure is being measured. When there is a pressure difference between the inside of the pipe and the outside‚ there will be a net force acting on the C-shaped pipe which will either try to curl the pipe into a tighter C shape (if the pressure in the pipe is
Premium Pressure Atmospheric pressure Vacuum
Title Cricket Chirp Rate Lab The Effects of Atmospheric Pressure By Abigail Charpentier E Block Date October 2‚ 2013 Objective The objective of this study is to determine which environmental factors influence the rate of how fast a cricket chirps‚ to review and practice the steps of the scientific method‚ to learn how to use an online computer simulation https://www.gc.maricopa.edu/biology/glacier/scientific_method/ to review and practice constructing data charts and graphs
Premium Test method Metabolism Temperature
Air Pressure Air is composed of molecules. Air is matter. It has mass and takes up space. Air is composed of different gases such as nitrogen‚ oxygen‚ carbon dioxide‚ water vapor‚ and other gases. Air molecules are in constant motion. As they move‚ they come in contact with surfaces. Air molecules push and press on the surfaces they contact. The amount of force per unit area that air molecules exert on a surface is called air pressure. (What is Air Pressure 6) Air pressure is caused by all
Premium Atmospheric pressure Gas Pressure
Lab activity 1: Effect of temperature‚ concentration‚ and pressure on equilibrium Introduction Our ongoing discussion has been on systems at dynamic equilibrium: for a reversible reaction‚ the rate of the forward reaction is equal to the rate of the reverse reaction. What happens if equilibrium is disturbed? In this lab activity‚ we are going to examine the effect of changing reaction conditions on the position of equilibrium. Part I: Effect of temperature We will consider the equilibrium
Premium Thermodynamics Chemical equilibrium Gas
Peer pressure I. We often hear about the dangers of peer pressure to teenagers. A. Teenagers take drugs‚ skip school‚ get drunk‚ or have sex because their friends do these things. Desperate to conform to their friends’ values‚ teens may give up their interests in school‚ in hobbies‚ and even in certain people. B. Teenagers may‚ first of all‚ lose or hide their interest in school in order to be like their friends. They adopt a negative attitude in which school is seen as a battlefield‚ with
Premium Adolescence Peer pressure Peer group
within a living cell is the plasma membrane. • Hypotonic : ➢ Having a lesser osmotic pressure in a fluid compared to another fluid‚ as in a ‘hypotonic solution’ – compare: hypertonic and isotonic • Hypertonic: ➢ Having a higher osmotic pressure in a fluid relative to another fluid. • Isotonic: ➢ Having the same (or equal) osmotic pressure and same water potential since the two solutions have an equal concentration of water molecules.
Premium Osmosis