Wait a second!
More handpicked essays just for you.
More handpicked essays just for you.
Importance of safety in laboratory
To verify the law of conservation of mass
Importance of safety in laboratory
Don’t take our word for it - see why 10 million students trust us with their essay needs.
Recommended: Importance of safety in laboratory
Law of Conservation of Mass
The Law of Conservation of Mass states that mass is an isolated system, it is neither created or destroyed. It also states that the mass of the products in a chemical reaction must be equal to the mass of the reactants. All of our experiments in chapter two had to do with mass and in every experiment we found the mass of the reactants and the mass of the products and in each one there wasn’t a significant change in mass.
Antoine Lavoisier was the one who introduced the Law of Conservation of Mass. Lavoisier ran many experiments and he was famous for his accurate observations and his insistence on careful measurements. He used accurate balances that could measure very, very small changes in his experiments. All of
…show more content…
This was a physical change because you can still get the salt back after it was mixed with the water. The reactants were the salt and water separated. The products were the salt and water mixed (saltwater). We used a closed system because when measure the mass in a closed system you don’t want anything to enter or escape or the mass would be completely different when you do the experiment and for this we would want any salt of water to spill or leak.
In experiment 2.4 we figured out if the mass of ice changes when it melts into water. This was a physical change because you can still turn the water back into the ice by freezing it. The reactant in this experiment was ice and the product was water. We used a closed system in this experiment because we don’t want any water to leak out of the container because we would lose mass and that would mess everything up.
In experiment 2.5 we found if the mass of copper and sulfur changed after heating it. This was a chemical change because when we heated the copper and sulfur a whole new substance was formed. The reactants in this experiment were the copper and sulfur. The products were a liquid and a gas. We used a closed system because we didn’t anything to spill and because we were heating the copper and sulfur it will form a gas and we didn’t want that to escape or the experiment would be
Thermodynamics is essentially how heat energy transfers from one substance to another. In “Joe Science vs. the Water Heater,” the temperature of water in a water heater must be found without measuring the water directly from the water heater. This problem was translated to the lab by providing heated water, fish bowl thermometers, styrofoam cups, and all other instruments found in the lab. The thermometer only reaches 45 degrees celsius; therefore, thermodynamic equations need to be applied in order to find the original temperature of the hot water. We also had access to deionized water that was approximately room temperature.
In this experiment, we are finding the Conservation of Energy. Energy is neither created nor destroyed. Energy is summed up into two different properties: Potential energy and Kinetic energy. The law of Energy states that:
Theory: Physics can be referred to as the study of various properties of matter and energy. Matter can best be described by looking at the mass of an object. Mass is the amount of material that is in an object. Mass can be found by using a spring scale, a balance scale, or an inertial balance. Inertia is the resistance by mass to any change in its state of motion. Scientific Law states that mass and inertial forces are directly proportional. The purpose of the inertial balance is to measure the different inertias between different masses therefore providing a mathematical and very accurate method of measuring mass. Experimentation showed that if a mass was put into some form of periodic motion, the mass could be measured fairly accurately by measuring the oscillation period and comparing it to a known mass period. The relationship m1=m2T12/T22 was discovered.
“A chemical reaction is a change that makes at least one new substance,” according to Richard Spilsbury (2014, p. 8) A physical reaction is when you mix two or more substances and those substances stay the same. This experiment demonstrates a physical reaction called ‘nucleation.’ The rough surface of the Mentos and the carbon dioxide inside the soda combine together to make the soda explode! This is not a chemical reaction because we do not make a new substance. “In physical changes, the original substances do not change chemically. For example, you can dissolve salt in water to make salty solution,” according to Richard Spilsbury (2014, p. 13). In this case, you still have salt and water, not a new product. With Diet Coke and Mentos, you still have these two substances in a much messier form, but you do not have a new
A good example would be the experiments with the concentrations of 20% to 60% concentration results to show the change. In the 20% concentration I noticed a decrease in the percentage change in mass for the experiment the percentage was _____ while for the concentration of sucrose 60% the change was _____ we can see that the percentage change in mass is decreasing thus we can conclude that the difference of the initial from the final and as it gets greater that means the mass of the potato changed massively.
This report discusses several different types of chemical reactions that were conducted in a lab. A chemical reaction is when two or more chemicals interact to form a new substance or rearrange the molecules within the substances. There are many signs that indicate when a chemical reaction has occurred. These changes include: a colour change, a gas being formed, a solid being formed, a change in temperature, precipitates are formed, a change in smell, light being emitted, a change in mass or volume, a change in conductivity, a change in boiling and/or melting point, and a change in taste. In the lab, thirteen different chemical reaction were conducted. Five of these reactions were single displacement reactions. A single displacement reaction is a reaction in which an element
Cu(NO3)2 was formed and all observations of the reaction were recorded. Reaction 2 of the experiment simply involved pouring 30 mL of 3 M NaOH into the beaker, using a graduated cylinder. The solution was stirred with a glass rod concurrently as the NaOH was being poured. Cu(OH)2 was formed and all observations of the reaction were
For this experiment we have to use physical methods to separate the reaction mixture from the liquid. The physical methods that were used are filtration and evaporation. Filtration is the separation of a solid from a liquid by passing the liquid through a porous material, such as filter paper. Evaporation is when you place the residue and the damp filter paper into a drying oven to draw moisture from it by heating it and leaving only the dry solid portion behind (Lab Guide pg. 33.).
The Grade 12 Physical Science learners at Penryn College were tasked with carrying out an experiment to investigate the effect of collisions on momentum. Different mass pieces (500g; 1kg and 1.5kg) were dropped on a moving trolley and the learners observed the velocity of the trolley before the mass pieces were dropped on the trolley and the velocity after the mass pieces were dropped. The velocities were then compared.
The Gravimetric Stoichiometry lab was a two-week lab in which we tested one of the fundamental laws of chemistry; the Law of Conservation of Mass. The law states that in chemical reactions, when you start with a set amount of reactant, the product should theoretically have the same mass. This can be hard sometimes because in certain reactions, gases are released and it’s hard to measure the mass of a gas. Some common gases released in chemical reactions include hydrogen, carbon dioxide, oxygen and water vapor.
Antoine Laurent Lavoisier is considered to be the father of modern-day chemistry (Balchin 36). He had an unbelievable impact on the way the world views chemistry today. From identifying elements to discovering the importance of the role of combustion, he played an essential part in the world’s scientific ideas and inventions. He was so influential that he is said to have an equal if not greater impact in chemistry as Newton did in physics (Tiner 90). He used the initial ideas of Joseph Priestley, Henry Cavendish, and Karl Scheele, and worked to prove them and make them more official (Tiner 90). Because of these accomplishments, he is considered one of France’s and the world’s most outstanding scientists (Tiner 91). Antoine Laurent Lavoisier was one of the world’s most influential scientists and people of all time because he was a leading figure in the 18th century chemical revolution, he developed a theory on the chemical reactivity of oxygen, and he discovered the Law of Conservation of Mass.