What is a rheostat?
A rheostat is an electrical device used in many applications that require the adjustment of current or the varying resistance... View Article
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Explain how to balance equations
Balancing of a chemical equation Write down your given equation. For this example, you will use: C3H8 + O2 –>... View Article
Do all the metals react with a base? If not, which metals react and why?
Answer: Some metal reacts with a base to form salts and hydrogen gas. Most metals do not react with bases... View Article
Why is crystallisation better than evaporation?
Crystallisation is a process that separates a pure solid in the form of its crystals from a solution. Crystallisation is... View Article
Comment on the statement “Rotational kinetic energy is equal to half of the moment of inertia into angular velocity”
The acceleration from Newton’s second law is equal to the final velocity divided by the time and the average velocity... View Article
What is the order of the reaction? Whose rate constant has the same units as the rate of reaction?
If the reaction is zero-order, the rate constant has exactly the same units as the rate of the reaction mol... View Article
What is a node?
Answer: Node is a point where the electron probability is zero. For a given orbital there are two types of... View Article
Is radical and valency are same? How charges are given on any element or compound?
Both are different. Combining capacity of an element or a radical with another element or radical to form a compound... View Article
Explain density in simple words.
What is the density? Density is a measure of how compact the mass in a substance or object is. The... View Article
Write the functions of excretory organs in animals?
The kidney and urinary systems help the body to eliminate liquid waste called urea and to keep chemicals, such as... View Article
What are the three types of papillae?
The dorsal surface of the mammalian tongue is covered with four kinds of papillae, fungiform, circumvallate, foliate and filiform papillae.... View Article
What is a Golgi apparatus?
The Golgi apparatus is a membrane-bound organelle found in most cells. It is responsible for packaging proteins into vesicles prior... View Article
In the combustion of methane, what is the limiting reactant and why?
Answer: The combustion of methane is a process that consists of a reaction between methane and oxygen in the air. When... View Article
What are antibiotics?
Answer: Antibiotics are a type of antimicrobial medicine that works by suppressing the growth of bacteria and is used to... View Article
What number should be subtracted from -2/3 to get -1/6?
Let x should be subtractedso-2/3 – x = -1/6-2/3 + 1/6 = xTaking their lcm and solving further(-4+1)/6 = x-3/6... View Article
What is neutron?
The existence of the neutron was proposed by Ernest Rutherford in 1920. It was discovered by James Chadwick in 1932,... View Article
What are isotopes?
An isotope is any form of a chemical element that has the same number of protons in the nucleus, or... View Article
An electromagnetic radiation of wavelength 242 nm is just sufficient to ionize a sodium atom. Calculate the ionization energy of sodium in kJmol-1
From E= hv or hc/ λ, we have λ = 242nm or 242 x 10-9m C = 3 x 108... View Article
How does cork act as a protective tissue?
Cork is the outer protective layer of bark of a tree. The cork cells are dead and compactly packed with... View Article
Is light opaque? Explain.
Light is an electromagnetic wave. It has no physical substances for us to see. An opaque object is neither transparent... View Article
