Two yellow substances are mixed in a flask. The flask then feels warm. This is an example of what kind of reaction? O isothermic exothermic endothermic combustion

Q: The names of the elements whose symbols are Si, P, Mn, and S are respectively: A) silicon,…

A: Symbols of an element normally consist of one or two letters from the Latin alphabet. The first…

Q: what does Cs and Cl react to

A: Caesium falls in the first group of the periodic table and chlorine falls in the seventeenth group…

Q: The name of the compound shown here is

A: In this question we have to tell the name of the compound. In the naming of amine 'e' of the alkane…

Q: a

A: This question is related to atomicity of molecules.

Q: State law of definite proportions.

A: Given: Law of definite proportions.

Q: Name this molecule. Red atoms are oxygen. Blue atoms are nitrogen

A: Step 1: We have 5 carbons in the ring. So the it will start with the name 'pent' Step 2: It is a…

Q: Supposed to magnesium feelings and sulfur or heat it so they react with each other forming magnesium…

A: Concept: The pure substances have constant composition throughout the given substance. The mixed…

Q: Name various radioactive elements.

A: The various names of radioactive elements are named as in step 2.

Q: 22 the mass in grams of 6.35 × 10 molecules of CBr4.

A: Given, molecule : CBr4 number of molecules 6.35×1022

Q: can a molecular formula represent different structures or molecules?

A: Yes a molecular formula can represent different structures or molecules. And those different…

Q: What is a molecular element?

A: A compound refers to the molecule which contains at least two different type of elements bonded…

Q: JJ Thomson is credited with the discovery of

A: J J Thomson, in full Sir Joseph John Thomson, (born December 18, 1856) is English physicist who…

Q: What characteristics must the substance have in order to be classified as an element?

A: Elements are the fundamental building blocks of matter. They are substances that cannot be broken…

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.