When a candle is burned, the heat of the flame melts the wax near the wick. This liquid wax is drawn up the wick by capillary action. The heat of the flame vaporizes the liquid wax (turns it into a hot gas) and starts to break down the hydrocarbons into molecules of hydrogen and carbon.
These vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapor (H2O), and carbon dioxide (CO2). This reaction is called combustion.
Rusting happens when iron comes into contact with water and oxygen.
When these three ingredients mix together, they form a compound called iron oxide. Iron oxide is brittle and flaky, and it causes the metal to weaken and eventually fall apart.
Science Q1 Week 3-5
When a candle is burned, the heat of the flame melts the wax near the wick. This liquid wax is then drawn up the wick by capillary action. The heat of the flame vaporizes the liquid wax (turns it into a hot gas) and starts to break down the hydrocarbons into molecules of hydrogen and carbon.
These vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapor (H2O), and carbon dioxide (CO2).
The process of rusting involves an oxidation reaction between iron and oxygen in presence of water. Rusting is an electrochemical process that requires an electrolyte like water to complete.
When iron comes into contact with water and oxygen, it undergoes a chemical change called oxidation or corrosion. During this process, electrons are transferred from iron atoms to oxygen atoms, forming hydrated iron oxide or rust.
Why is a Rusting Nail a Chemical Change
When a metal object rusts, it’s undergoing a chemical change. The iron in the metal reacts with water and oxygen in the air to form hydrated iron oxide, which we see as rust. This reaction is called corrosion.
Corrosion is an electrochemical process that occurs when two dissimilar metals are in contact with each other in the presence of an electrolyte, like water. When this happens, one of the metals (the anode) corrodes while the other (the cathode) remains unaffected. The process of corrosion can be slowed down by using a coating or barrier on the metal surface that prevents oxygen and water from coming into contact with the metal.
What is Included in a Chemical Equation
A chemical equation is a way of representing a chemical reaction using symbols. The reactants are represented on the left side of the arrow and the products are represented on the right side. The arrow represents the direction of the reaction.
In order for a chemical equation to be balanced, there must be the same number of atoms of each element on both sides of the arrow. This can be accomplished by adding coefficients in front of the symbols. For example, if two water molecules are needed to balance one oxygen molecule, then we would write:
2H2O + O2 –> 2H2O2
What is Included in a Chemical Reaction
In a chemical reaction, atoms are rearranged to form new molecules. This process is accompanied by a change in the chemical properties of the reactants. The reactants in a chemical reaction are called the reactants, while the products are called the products.
A chemical equation is used to describe a chemical reaction. In a chemical equation, the symbols for the reactants and products are placed on either side of an arrow that represents the direction of the reaction.
Is Rusting a Chemical Change Or Physical
Rusting is a chemical change that happens when iron reacts with water or air to form rust. Rust is a red or orange oxide that forms on the surface of iron. It’s not very strong, so it can flake off and break apart easily.
Balance Each of the Following Reactions And Identify the Type of Reaction
In a balanced reaction, the number of atoms of each element on each side of the equation is equal. The types of reactions are: synthesis, decomposition, single replacement, double replacement, and combustion.
1) 2H2 + O2 → 2H2O
This is a synthesis reaction because two substances combine to form one new substance. The products are water molecules (H2O), and the reactants are dihydrogen (H2) and oxygen (O2).
2) NaCl → Na+ + Cl-
This is a decomposition reaction because a compound splits into its component parts. The products are sodium ions (Na+) and chloride ions (Cl-), and the reactant is table salt or sodium chloride (NaCl).
3) Zn + HCl → ZnCl2 + H2
This is a single replacement reaction because one element replaces another in a compound. The products are zinc chloride (ZnCl2) and hydrogen gas (H2), and the reactants are zinc metal (Zn) and hydrochloric acid (HCl).
4) CaCO3 → CaO + CO2
This is a decomposition reaction because a compound splits into its component parts. The products are calcium oxide (CaO) and carbon dioxide gas (CO2), and the reactant is calcium carbonate ((CaCO3).
Why are Burning Candles And Rusting Nails Examples of Chemical Change Quizlet
When a candle burns, the heat of the flame melts the wax near the wick. This liquid wax is drawn up the wick where the heat of the flame vaporizes it, breaking the hydrocarbons down into molecules of hydrogen and carbon.
The light you see from a burning candle is not just from the heat of the flame, but also from these vaporized molecules recombining and emitting visible light as they return to their solid or gaseous state.
The process of a burning candle is therefore a chemical change.
Rusting nails are another example of chemical change. Rusting occurs when iron comes into contact with oxygen and water, which creates iron oxide.
This reaction is accelerated by warm temperatures and salt water.
Just like burning candles, rusting nails are examples of chemical changes because they involve a rearrangement of atoms to form new compounds.
Complete And Balance Each of the Following Reactions
Assuming you would like a blog post discussing the chemical reactions:
2H2 + O2 –> 2H2O
C6H12O6 + 6O2 –> 6CO2 + 6H20
In order to complete and balance these reactions, we must first understand what they are telling us. In a chemical reaction, there are reactants, which are the substances that react with one another to create new products. In the first equation, the reactants are two molecules of hydrogen gas (H₂) and one molecule of oxygen gas (O₂).
The products of this reaction are two molecules of water (H₂O).
In order to complete this equation, we need to make sure that there is an equal number of atoms on each side of the arrow. Because H₂ has two atoms of hydrogen, we need two H₂Os in order for this to be balanced.
We also need one O on each side in order for this equation to be balanced. This can be accomplished by adding a coefficient in front of each compound:
2H₂ + O₂ —> 2H₂O
The same process can be applied to the second equation. The reactants here are one molecule of glucose (C₁₆H₁⃦), or six moles of oxygen gas (6O₃). The products will be six molecules of carbon dioxide gas (6COᵇ), and six moles of water vapor (6Hᵈ⁵⁶).
In order for this reaction to be balanced, we need 12 oxygen atoms on each side. This can again be accomplished by adding coefficients in front of our compounds:
How Does a Combination Reaction Differ from a Decomposition Reaction
A combination reaction is a type of chemical reaction in which two or more reactants combine to form a single product. In a decomposition reaction, a single reactant breaks down into two or more products.
The difference between these two types of reactions can be illustrated with the following example:
Consider the reaction between hydrogen and oxygen to form water:
2H2 + O2 → 2H2O
This is a combination reaction because two reactants (hydrogen and oxygen) are combining to form one product (water).
In contrast, the decomposition of water into hydrogen and oxygen would be written as:
H2O → H2 + O2
Here, one reactant (water) is breaking down into two products (hydrogen and oxygen).
Credit: www.numerade.com
Why is Burning a Candle a Chemical Change?
When you light a candle, the heat of the flame melts the wax near the wick. This liquid wax is then drawn up the wick by capillary action. The heat of the flame vaporizes the liquid wax (turns it into a hot gas) and starts to break down the hydrocarbons into molecules of hydrogen and carbon.
These vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapor (H2O), and carbon dioxide (CO2).
This process is called combustion, and it’s what gives candles their flickering flames. But it’s also a chemical change because it transforms the molecular structure of the wax.
Why are Burning Candles And Rusting Nails a Chemical Change Quizlet?
When a candle is lit, the heat of the flame melts the wax near the wick. This liquid wax is then drawn up the wick by capillary action. The heat of the flame vaporizes any liquid wax drawn up the wick, and as this vaporized wax reaches the flame, it ignites and the flame of the candle is sustained.
The chemical reaction that occurs when a candle is lit can be represented by this equation:
wax + heat → liquid wax + vaporized wax + light + heat
The reactants in this equation are Wax and Heat, while the products are Liquid Wax, Vaporized Wax, Light, and Heat.
The light produced by a burning candle comes from the vaporized wax reaching its ignition point and burning.
The reason why rusting nails are a chemical change has to do with how iron reacts with oxygen in presence of water. When these three ingredients are combined, they create an electrochemical reaction called oxidation-reduction (or redox for short).
In redox reactions, one element’s oxidation state increases while another element’s oxidation state decreases. For example:
Is Burning And Rusting a Chemical Change?
Yes, burning and rusting are both chemical changes. In a chemical change, the molecules of the reactants rearrange to form new molecules of products. This can be seen in burning, where the reactant is a fuel and the product is ash, or in rusting, where the reactant is iron and the product is iron oxide.
Is Rusting Nails a Chemical Change?
When a nail is exposed to air, it will slowly start to develop a reddish-brown coating. This process is called rusting. Rusting is caused by a chemical reaction between the iron in the nail and the oxygen in the air.
Over time, this reaction will cause the nail to break down and crumble.
Rust is not just a cosmetic issue – it can also weaken the structure of the nail. If left unchecked, rust can eventually cause the nail to fall apart completely.
For this reason, it’s important to take steps to prevent nails from rusting in the first place.
One way to do this is to keep them dry. When water comes into contact with iron, it creates an environment that promotes rusting.
So, if you want to keep your nails looking good (and avoid having them fall apart), make sure to keep them away from moisture as much as possible.
Another way to prevent rusting is by using a sealant or paint designed for metal surfaces. These products create a barrier between the metal and oxygen, which helps slow down the rusting process.
However, they will need to be reapplied periodically as they will eventually wear off over time.
Conclusion
When a candle is lit, the heat of the flame melts the wax near the wick. This liquid wax is drawn up the wick by capillary action. The heat of the flame vaporizes the liquid wax (turns it into a hot gas) and starts to break down some of the hydrocarbons into molecules of hydrogen and carbon.
These vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapor (H2O), and carbon dioxide (CO2). The water vapor condenses on the glass surface of the jar or container holding the candle, providing a self-extinguishing mechanism for candles in open containers.
The rusting of iron nails is an example of oxidation: specifically, it’s an electrochemical process in which electrons are transferred from iron atoms to oxygen atoms.
The resulting compound is called ferric oxide, or rust. Rust is flaky and crumbly because it consists of very fine grains of iron oxide that have expanded as they formed; this expansion causes fractures in any structure containing rust.