Mass Lab

In this lab, the purpose was to determine the stability of a substance after adding an acid or a base. The results claim that liver and buffer are the most resistance to change in pH. Looking at figure 3, buffer and liver both maintain a stable pH even with the addition of an acid or base. However, potato and water have less buffer in them since their pHs did change. In figure 3, the potato acid’s pH level decreased by two, and the potato base’s pH level increased by two. The level of pH of a water acid decreased by 4, while the water base’s pH increased by 5. These results all tie to the fact that buffer is a substance that maintains a stable pH; the presence of buffer in organisms help maintain homeostasis by binding or releasing hydrogen

The law of conservation of mass states that matter can be changed from one form into another, mixtures can be separated or made, and or substances can be decomposed, but the total amount of mass remains constant. Taking this law from a different view we can state that the total mass of the universe remains constant. Whenever matter undergoes change the total mass of the products will be the same as the total mass of the reactants. For example, in this experiment sodium hydroxide and copper sulfate, the reactants have a total mass of 21.4 grams. The total mass of the products, copper hydroxide and sodium sulfate, was 21.13 grams. The 0.27 grams was a result of the solution staying on the thermometer that was used to measure the temperature. This law was formulated in the end of the 18th Century. It marked the beginning of modern history.

A chemical reaction is when substances (reactants) change into other substances (products). The five general types of chemical reactions are synthesis (also known as direct combination), decomposition, single replacement (also known as single displacement), double replacement (also known as double displacement), and combustion. In this lab, the five general types of chemical reactions were conducted and observations were taken before, during, and after the reaction. Then the reactants and observations were used to determine the products to form a balanced chemical equation. The purpose of this lab was to learn and answer the question: How can observations be used to determine the identity of substances produced in a chemical reaction?

In this experiment you will observe some physical and some chemical changes. You will observe that energy must be used to start some chemical reactions, and that it is produced in others.

Paragraph 1 - How the Law of Conservation of Matter is supported by the experimental demonstrations: In the law of conservation particles and materials are neither created nor destroyed . It was similar towards the experimental demonstrations because nothing changed or destroyed in the processes .Kinetic and potential energy was used in the experiments.

The range of normal resting systolic BP for the subjects in this experiment is 115-125 mmHg. Did systolic BP increase, decrease, or not change with exercise?

1. Objective: My objective for this experiment is to find the mass, volume, and density of a variety of objects. After this, I will record my data and place a select few of the items on a graph. My hypothesis for this experiment is, "If I measure the mass of every object, the wooden ball will have the least because it seems to be the smallest and most lightweight. " 2.

The Grignard reaction is an important synthetic process by which a new carbon to carbon bond is formed. Magnesium metal is first reacted with an organic halide forming the Grignard reagent. The Grignard reaction is the addition of an organomagnesium halide (Grignard reagent) to a ketone or aldehyde, to form a tertiary or secondary alcohol, respectively. For example, the reaction with formaldehyde leads to a primary alcohol. Grignard Reagents are also used in the following important reactions: The addition of an excess of a Grignard reagent to an ester or lactone gives a tertiary alcohol in which two alkyl groups are the same, and the addition of a

There’s a difference between a chemical and physical prop-erties/changes. Physical properties are an aspect of matter that can be observed or measured without changing it. The Examples for Physical properties would include: color, smell, freezing point, boiling point, melting point, etc. While Chemical properies may only be observed by changing the chemical identity of a substance. An example for Chemical properties would be rusting iron.

In a chemical reaction, atoms may be rearranged according to their position, but as the law of conservation of mass states, atoms are never created nor destroyed during a reaction. In Chemistry, Stoichiometry can be defined as the observation of the amount of substances used during a reaction. In a reaction a certain number of reactants form a particular amount of product. In the above experiment, the goal was to react copper chloride with sodium phosphate to form Copper (II) phosphate trihydrate. When a chemical reaction is performed in a laboratory, the ratio of the number of reactants used for the reaction is not equal to the stoichiometric ratio of the reaction.

The law of conservation of mass states that mass cannot created or destroyed but how did this law come to be. Well the ancient Greeks proposed that the total amount of matter in the universe is constant. But the law was first confirmed in about 1785 by Antoine Lavoisier when he weighed his reactants before the reaction and after the reaction and they weighed the same. We can still perform this experiment and see that Lavoisier's conclusion was true.

One important contribution that Antoine Lavoisier made to chemistry was the conservation of mass. In France, the law of conservation of mass is commonly referred to as Lavoisier’s Law showing the lasting impression that he made on the world of chemistry (Donovan, 2017). The law, in its entirety, envelopes the ideas that matter can be transformed from one form to another, mixtures can be separated or developed, and pure substances can be broken down, but the mass will always remain constant (World of Chemicals, 2017). The law was first identified in the Traité élémentaire de Chimie, a book that incorporated the foundations of modern chemistry in 1789 (American Chemical Society, 1999). Originally, the law of conservation of mass was an assumption

Faced with these experimental facts, Van Helmont theorized that the increase in weight of the willow arose from the water alone.” This shows the law of conservation of matter because the weight didn’t come from the soil because the soil only weighed 2 ounces less when it was re dried. The weight must have come from the gases, because the product is made of the same atoms and molecules as the reactants so the product will have the same mass as the

Label the 3 test tubes with your initials and number each 1,2, and 3. (This allows for them to be distinguished)

The purpose of this lab was to test the law of conservation of mass by comparing the total mass of the reactants in a chemical reaction with the total mass of the product.