Welcome to the
Science Page !
Your task for today
is based on Material Changes.
The Law of Conservation of Mass states that mass is neither
created nor destroyed in an ordinary chemical reaction. When an iron nail
rusts, it seems to get heavier in mass.
1.
Does the iron nail follow the Law of
Conservation of Mass? Explain.
2.
When wood burns, a small amount of ash is made.
Why is the mass of the wood before the fire not equal to the mass of the ash
after the reaction?
This comment has been removed by the author.
ReplyDeleteAnswer 1:The Law of Conservation of Mass states that when you attempt a reaction, the starting mass of the product must be the same mass when you complete your reaction. However, the Iron Nail starts off with a certain mass. But, when you do your experiment of rusting the nail, you will find that it is heavier than it was at the beginning. This is because Oxygen and Moisture is required for the process of rusting to take place. More elements are added, something you might have not calculated at the beginning of the test.
ReplyDeleteAnswer 2: The mass of the wood before it was burned and the mass of the ash are not equal yet they still follow the Law of Conservation of Mass. Heat and Energy is dissipated in the burning process. That Heat and Energy is the remaining mass which is missing in the equation.
Ahmed Sharafath - Grade 8B
This comment has been removed by the author.
DeleteWell Done! Sharafat
ReplyDeleteAnswer 1: The law of conservation of mass states that when you do something, the weight of what is made is the same as the weight of what you started with. No problem, right?
ReplyDeleteWell, in this example, it certainly seems like a problem. If you take an iron nail and let it rust in air, you'll find that the weight of the rusted nail is larger than that of the nail before it rusted. That is because the oxygen (you didn't weigh) combined with the iron to make it rust resulting in the oxygen combining with the iron nail,after the rust.
Answer 2: The mass of the wood and the oxygen is is equal to ashes and the Carbon dioxide after the reaction.
1: The Law of Conservation of Mass states that mass is neither created nor destroyed in an ordinary chemical reaction. The nail had this certain mass starting out,but as you add in other elements(which you haven't calculated) like oxygen,water,moisture etc., surely its mass would change. You add something to something, why wouldn't its mass change?
ReplyDelete2: When you burn wood,ash is not the only thing that comes out of it. Fire + Wood = Ash,CO2,Heat,Energy(possibly more things which i cannot name). If you add all of the things that come out of burning wood, it will equal to the same mass of the wood before it was burnt. It may seem like its different but its not! The mass is just distributed evenly between all of them but ash is the only thing that we can physically touch and see thus we say that when wood is burnt, only ash is left out which is not true at all!
1:The law of conservation states that the mass would not increases or decrease in a regular chemical reaction.When the nail is miked with substances such as water or oxygen definitely the mass would change.
ReplyDelete2: The mass of the wood and the oxygen is is equal to ashes and the Carbon dioxide after the reaction.
This comment has been removed by the author.
Delete1: The Law of Conservation states that no atoms are ever lost, they are made into a new substance. For rust to form on a piece of iron it needs to come in contact with air and water for a long period of time. So the iron nail does follow the law of conservation since it uses the properties of oxygen in air and the properties of water to form rust.
ReplyDelete2: This is due to the substances in wood. Wood contains multiple substances in which only some of the substances turns in to ash. The rest turns into gas which is caused by the reaction of fire heating it.
Rust is a chemical compound. Iron oxide forms when iron reacts with oxygen in the presence of water. A rusty nail weighs more because the compound contains an additional element (oxygen) plus the moisture which creates the reaction. The nail initially contains only the iron.
ReplyDeleteBurning wood is a combustion reaction involving oxygen. An organic compound, like gasoline combines with oxygen creating CO2 and water vapor. Most of the initial mass is transformed from its initial state to gaseous compounds leaving only a residue of ash. So the Law of Conservation of Matter applies.
If the number of atoms of each element remains the same, then the mass can never change in a
ReplyDeletechemical reaction. The total mass of the reactants must equal the total mass of the products. This
observation that mass must remain constant in a chemical reaction as known as the law of
conservation of mass.
The formulation of this law near the end of the eighteenth century marked the beginning of modern chemistry. By that time many elements had been isolated and identified, most notably oxygen, nitrogen, and hydrogen. It was also known that, when a pure metal was heated in air, it became what was then called a calx (which we now call an oxide) and that this change was accompanied by an increase in mass. The reverse of this reaction was also known: Many calxes on heating lost mass and returned to pure metals. Many imaginative explanations of these mass changes were proposed. Antoine Lavoisier (1743-1794), a French nobleman later guillotined in the revolution, was an amateur chemist with a remarkably analytical mind. He considered the properties of metals and then carried out a series of experiments designed to allow him to measure not just the mass of the metal and the calx but also the mass of the air surrounding the reaction. His results showed that the mass gained by the metal in forming the calx was equal to the mass lost by the surrounding air.so rusting the nail, you will find that it is heavier than it was at the beginning. This is because Oxygen and Moisture is required for the process of rusting to take place.
2.Wood contains multiple substances in which only some of the substances turns in to ash. The rest turns into gas which is caused by the reaction of fire heating it
This comment has been removed by the author.
ReplyDeleteThis comment has been removed by the author.
ReplyDeletehow do you know did you google it out?
DeleteThis comment has been removed by the author.
DeleteA 1:The picture above is describing natural chemical reactions.
ReplyDeleteIron oxide forms when iron reacts with oxygen in the presence of water. A rusty nail weighs more because the compound contains an additional element which is oxygen, and the moisture which creates the reaction. So it does follow the law of conservation as the mass of the chemicals before the reaction and the mass after the reaction is the same.
A 2: The mass of the wood and the ashes equals the mass of the oxygen and the smoke given off during the time that the wood was burnt.
1)Rusting is the result of a chemical reaction that occurs when iron is in contact with (salt,) water and oxygen, making up 'Iron Oxide'. Yes, the action of an iron nail rusting does follow the Law of Conservation of Mass. This is because of the initial mass of the iron nail is the same when calculated all in all after rusting. It's just that these factors of rusting has been added to create the compound 'rust'.
ReplyDelete2) The mass of the burning wood is not the same as the amount of ash produced because of the combustion reaction that took place. The ash was just a solid component of the products of the burning. Carbon dioxide is another product of the reaction, which appears in a gaseous form. The Law of Conservation of Mass still applies in this situation because if you calculated it, the mass of the wood and the mass of the products (the solids and gases alike) are the same.
Ma. Raphaela 8A
Answer 1:The Law of Conservation of Mass states that when you attempt a reaction, the starting mass of the product must be the same mass when you complete your reaction. However, the Iron Nail starts off with a certain mass. But, when you do your experiment of rusting the nail, you will find that it is heavier than it was at the beginning. This is because Oxygen and Moisture is required for the process of rusting to take place. More elements are added, something you might have not calculated at the beginning of the test
ReplyDeleteAnswer 1:The Law of Conservation of Mass states that when you attempt a reaction, the starting mass of the product must be the same mass when you complete your reaction. However, the Iron Nail starts off with a certain mass. But, when you do your experiment of rusting the nail, you will find that it is heavier than it was at the beginning. This is because Oxygen and Moisture is required for the process of rusting to take place. More elements are added, something you might have not calculated at the beginning of the test
Answer 2: The mass of the burning wood is not the same as the amount of ash produced because of the combustion reaction that took place. The ash was just a solid component of the products of the burning. Carbon dioxide is another product of the reaction, which appears in a gaseous form. The Law of Conservation of Mass still applies in this situation because if you calculated it, the mass of the wood and the mass of the products (the solids and gases alike) are the same.
In physics, the law of conservation of energy states that the total energy of an isolated system remains constant—it is said to be conserved over time.
ReplyDeleteThe mass of the wood and the oxygen is is equal to ashes and the Carbon dioxide after the reaction.