Yes it is a chemical change as it involves the formation of ash and releases heat. Which can not be reversed to get fuel. In a chemical change the change of properties take place . For example we can write on paper and can fold it ,but if we burn it we get ash and
Density depends upon the number of particles in a unit area. So it doesn’t matter what kind of particles are used. So it is a physical property.
No, dissolving is a physical process, provided that the substances which are being mixed should not react with each other.
This is true that a strong acid HCl is formed in our stomach , but it does not harm the internal tissues or organs. The acid is formed for two major reasons. To carry out the digestion especially the enzyme pepsin requires acidic medium for the proper functioning . The acid acts as a first
Vanadium’s electronic configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d3 the outer shell configuration is 4s2 3d3
Any atom , ion, complex ion, or group of atoms that can donate a pair of electrons are the Lewis bases. for example ammonia(NH3 ) , hydroxide ion(OH – ), chloride ion (Cl – )
Mandleev arranged the elements on the basis of increasing order of the atomic masses of the elements. He divided the 63 elements which were known or discovered at that time. There were 8 groups and 6 periods in his Periodic Table. Most importantly he made cards of every element , and wrote the reactions of
Actually chemical bonding is based on the Atomic number and electronic configuration. And the main thing is valency which is based on the number of outer(valence) electrons. Valency decides that how many bonds can be made by an atom . Thus if you ignore periodic table, you have to learn atomic number and electronic configuration
The answer is simple, like you are hungry you can pay more to get the food than that of the person who is less hungry, Similarily here the non metals want electrons thus they spend the energy more , or they release the energy. By this they lose the energy. So smaller is the size
Chemical change is a change in which a new substance is formed which is have totally new properties . And during rusting of iron, the iron oxide is formed that will not show the shine of metal, will not be a good conductor of electricity etc. thus rusting is a chemical change.
Ar, Argon is having the highest ionisation energy in 3rd period. This is due to the fact that it belongs to noble gases , and their outer shell is complete and they are enough stable. So to bring out the electron by applying energy is not an easy task.
The covalent compounds have low melting and boiling points. There is a reason behind this phenomenon. In case of covalent compounds the molecules are non-polar and even if there is a polarity in the molecule, that is also just for a moment. Thus each molecule exists as a discrete particle which do not have affinity
The enzymes increase the surface area and makes it available for reactants to come closer and react. Thus this makes it easy for the reactants to react faster and thus the rate of chemical reaction increses.
To determine the chemical symbol of an element we follow 2 main rules given below :- 1. The symbol of every element is expressed with capital letter. 2. If symbol includes more than one alphabet , then the first alphabet will be in capital case and second will be in lower case.
During a chemical change or chemical reaction , the new substances are formed with different properties. But, The atoms remain unchanged during a chemical reaction. Only their rearrangement takes place. As shown below :- 3Fe(s) + 4 H2O(l) ——–> Fe3O4 (s) + 4 H2(g)
The steam will cause more burning . This is due to the fact that water absorbs heat at 100°C to make steam or transform into gas , but the temprature remains the same. So the heat provided is utilized in changing the state. Thus stem is having more (hidden) heat even if its temperature is
Yes burning of wood is a chemical change as it leads to the formation of a new substance ash, which is chemically different from the wood. The chemical properties of ash are totally different from that of the wood.
A balanced chemical equation is the equation that is having equal number of atoms on both of the sides, that is on reactants side (Left Hand Side) and products side (Right Hand Side). Here in the following reaction we can see clearly 3Fe(s) + 4 H2O(l) ——–> Fe3O4 (s) + 4 H2(g) For further clarification just click on
No , melting of ice will not be a chemical change as it simply involves the change in the state of water. But during this change the colour, odour, taste , chemical or molecular formula will remain the same . And these all are the indications of physical change only.
The detailed simplified and shortest differences and explanation is given in the following link just have a look. https://theunconditionalguru.in/2020/04/19/what-are-some-basics-of-chemical-reactions-and-chemical-equations-how-we-can-learn-the-chapter-1-one-cbse-pseb/
The complete steps to balance the chemical equation is given here with example https://theunconditionalguru.in/2020/04/19/how-we-can-to-balance-the-chemical-equation-cbse-class-10-pseb/
Chemical indicators are the substances that give us the information about acids and bases by changing their own colour or smell. types of indicators :- Natural indicators :- These are the indicators that we get from the nature and are used as it is. For example :- Litmus and turmeric . Synthetic indicators :- These
The chemical formula of baking soda is NaHCO3, and its name is sodium hydrogen carbonate.