Chemistry
is burning a chemical change ?
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
is density a physical or chemical property ?
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.
is dissolving a chemical change?
No, dissolving is a physical process, provided that the substances which are being mixed should not react with each other.
How is HCl, an extremely potent acid, formed in our stomach and how does it not react with our organs?
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
What is the outermost electronic configuration of the vanadium ?
Vanadium’s electronic configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d3 the outer shell configuration is 4s2 3d3
Which specie can act as what are lewis base s ?
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 – )
how did mendeleev arrange chemical elements ?
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
Is it compulsory to read periodic classification of elements before chemical bonding or Can I start chemical bonding before periodic classification?
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 electrons that gain enthalpy for metals is positive and negative for non metals. Also, if metals are bigger in size than non metals then, how can electrons gain enthalpy is inversely proportional to the atomic size?
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
Is rusting a chemical change ?
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.
Which element has the highest ionization energy in the 3rd period?
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.
Why is the more covalent character, the less the melting point?
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
how do enzymes catalyze chemical reactions ?
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.
how is the chemical symbol of an element determined ?
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.
what happens to atoms in a chemical reaction ?
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)
Which will cause more burning , liquid water at 100°C or steam at 100°Celcius.
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
is burning wood a chemical change ?
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.
what is a balanced chemical equation ?
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
Is melting of ice a chemical change ?
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.
What are the chemical changes ?
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/
how do you balance chemical equations ?
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/
what is a chemical indicator ? And give its types.
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
what is the chemical formula for baking soda ?
The chemical formula of baking soda is NaHCO3, and its name is sodium hydrogen carbonate.
what is the chemical formula for calcium carbonate ?
CaCO3 is the chemical formula of calcium carbonate.
why do most atoms form chemical bonds ?
Kossel and Lewis in 1916 Developed the theory for the bond formation after watching the behavior of noble gases. The noble gases were inert in behavior and do not react with any substance. Kossel and Lewis found that the Octateof noble gases was complete so they do not react. They gave the theory that the
How is energy involved in chemical and physical changes ?
Physical and chemical changes are associated with energy changes. For this we have to understand the type of changes. 1. Exothermic :- These are the changes that release energy when they occur . 2. Endothermic :- The changes that occur by absorbing the energy are the endothermic . In case of chemical change the reaction
How do catalysts increase the rate of a chemical reaction ?
The catalyst is a substance that increase the rate of reaction without getting consumed in a chemical reaction. It is recovered as it is after the reaction. The catalyst increase the rate of reaction by following two ways :- 1. The catalyst provide the surface area for the reactants to react easily. 2. The catalyst
During dilution why acid is added to water not water added to the acid ?
The precautions must be taken while dilution. And it has to be taken care of that it is to be done only by the experts. We have to be strict and stick to the statement , ” Always add acid to water while dilution”. The dilution of acid is a highly exothermic process . Now
What is the chemical name of the compound cu2co3 ?
The chemical name of Cu2CO3 is Copper(II) carbonate and it is also named as Cupiric carbonate .
What is the chemical formula for hydrochloric acid ?
The chemical formula of hydrochloric acid is HCl.
what do chemical symbols and formulas represent respectively ?
Chemical symbols :- These are the symbols that are used to depict a specific element. Like N is the symbol of Nitrogen, Fe is the symbol of Iron, C of Carbon, Zn of Zinc and O of Oxygen. Chemical formula :- These formulas give us information of a molecule that how many atoms of a
what does the arrow in a chemical equation mean ?
The arrow in between the chemical equation is an important part of the equation. It depicts that the reactants are converted into products. Or in simple language we can say it shows the conversion of reactants into products. On its left hand side are the reacting species and on its right hand side are the
how can we or one increase the rate of a chemical reaction ?
We can increase the rate of chemical reaction by 1. Increasing the temperature of reaction mixture . 2. If there is a reduction in volume then we can increase the rate of reaction by applying pressure . 3. We can increase the risk of rejection by adding suitable catalyst .
is digesting food a chemical change ?
Digestion is a process in which complex food molecules are broken down into simple molecules that can be taken up by the body. During digestion Sugar is converted into glucose , Oils and Fat is converted into fatty acids , Proteins are converted into amino acids . Sugar substances formed from the complex molecules are
Is sublimation a chemical change or a physical change ?
In a physical change the nature of substance remains same . The properties remains same. But in case of chemical change the new kind of substance is formed, with different nature. “Sublimation is a process in which a substance changes its state from solid into vapour directly”. So the point to note here is that
Which elements have the most similar chemical properties ?
the group contains elements with similar properties.
How are chemical formulas of binary ionic compounds generally written ?
The formula of binary ionic compounds is written by following some rules and these must be followed. Firstly the positively charged ion, Cation is written first and then the negatively charged, Anion is written. After this the corresponding number of ions are written as the subscript. For example CaCl2 and NaCl. Lets see how the
what is the chemical formula for carbon monoxide ?
The chemical formula of carbon monooxide is CO , which means that in a molecule of carbon-monooxide there is one atom of Carbon and one atom of oxygen.
Which subatomic particles are involved in chemical bonding ?
The electrons participate in chemical bonding. basically every bond formation is due to the reason that every element tends to complete its octet (outer shell). “atoms can combine either by transfer of valance electrons from one atom to another or by sharing of valence electrons in Order to have a complete octet or the configuration
what is the chemical formula for hydrogen peroxide ?
The chemical formula for hydrogen peroxide is H2O2 it means that in its 1 molecule , there are 2 atoms of Hydrogen and two atoms of oxygen.
what happens to matter during a chemical reaction ?
During a chemical reaction new substances are formed with different properties. The total mass and number of atoms remain same , only the rearrangement of atoms take place. Lets take an example of formation of water from hydrogen and oxygen. The point is , that the hydrogen is an explosive gas and oxygen is essential
what is the chemical equation for cellular respiration ?
The equation for cellular respiration involves the formation of carbon-dioxide and water by the oxidation of glucose. the complete reaction is as follows :- C6 H12 O6 + O2 → CO2 + H2O
What is the chemical formula for sugar ?
The Chemical name for sugar is Sucrose and its formula is C12 H22 O11
what is the chemical formula for table salt ?
Chemical name for table salt is Sodium Chloride and its formula is NaCl .
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Hi, I’m Ankush Sharma. post graduate in chemistry and organic chemistry specialist
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