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I guess you mean the number "2" in O2. It is the valency of oxygen which means oxygen can have two single bond (hydrogens) with two other elements or a single double bond with an element. A good example methane-CH4, here single carbon atom paired with four hydrogens with four single bonds.
What else can I help you with?
What is a subscript in a balanced chemical equation?
A subscript in a balanced chemical equation indicates the number of atoms of an element present in a molecule. It is a small number that appears at the bottom right of the element's symbol. Balancing the equation ensures that the number of atoms of each element is the same on both sides of the equation.
What cant be changed when balancing a chemical equation?
The chemical formulas of the reactants and products cannot be changed when balancing a chemical equation. The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction, so the number of atoms of each element on both sides of the equation must be equal.
What does MnO2 mean in a chemical equation?
It means you have some manganese(IV) oxide. This compound most often shows up in chemical equations as a catalyst. It is most popularly used as a catalyst in the decomposition of hydrogen peroxide (H2O2.) A catalyst speeds up a chemical reaction by lowering the reaction's activation energy. In the equation for a chemical reaction, the catalyst is written in superscript-small symbols above the "yield" arrow.
What is the small number called to the right of the symbol molecule and the chemical equation?
It's called a subscript, and in the formula for a substance, it tells you how many representative particles you have of that substance. If there is no subscript, it is understood to be 1, which means you only have 1 representative particle of that substance. Examples: H2O, or water, means you have 2 hydrogen atoms and 1 oxygen atom. Ca(NO3)2, or calcium nitrate, means you have 1 calcium atom, and 2 nitrate polyatomics (comprised of a total of 2 nitrogens and 6 oxygens.) A subscript outside a set of parentheses distributes to everything in the parentheses.
What is the chemical equation for coal?
Coal is made up from different elements: primarily carbon but also containing hydrogen, sulfur, oxygen, nitrogen, inorganic compounds. Coal is a complex mixture: no "equation" or chemical formula.
What does the small number 2 mean in a chemical equation?
This is the number of atoms of a given element.
What is a the small whole number that appears in front of a formula in a chemical equation?
It is the coefficient.
What is a subscript in a balanced chemical equation?
A subscript in a balanced chemical equation indicates the number of atoms of an element present in a molecule. It is a small number that appears at the bottom right of the element's symbol. Balancing the equation ensures that the number of atoms of each element is the same on both sides of the equation.
The small number used to represent the number of ions of a given element in a chemical formula?
The small number used to represent the number of ions of a given element in a chemical formula is called a subscript. Subscripts are written to the right of the element's symbol and indicate the number of atoms or ions present.
What do subscripts represent?
Subscripts represent the number of atoms of an element in a molecule. They are written as small numbers to the right of the element symbol in a chemical formula. They indicate the ratio of elements in a compound.
What is the definition of An proposed answer to a problem is called if it can possibly be within a small distance of the actual answer?
Reasonable solution or Reasonable answer
What cant be changed when balancing a chemical equation?
The chemical formulas of the reactants and products cannot be changed when balancing a chemical equation. The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction, so the number of atoms of each element on both sides of the equation must be equal.
A small number of people used to represent a entire population?
a sample
What is the small triangle above the horizontal arrow in a chemical equation?
It means heat was supplied to make the reaction occur.
A small number of people used to represent an entire population is called a?
A small number of people used to represent an entire population is called a sample. Typically the sample reflects characteristics of the larger population from which it is drawn.
What does MnO2 mean in a chemical equation?
It means you have some manganese(IV) oxide. This compound most often shows up in chemical equations as a catalyst. It is most popularly used as a catalyst in the decomposition of hydrogen peroxide (H2O2.) A catalyst speeds up a chemical reaction by lowering the reaction's activation energy. In the equation for a chemical reaction, the catalyst is written in superscript-small symbols above the "yield" arrow.
What is the small number called to the right of the symbol molecule and the chemical equation?
It's called a subscript, and in the formula for a substance, it tells you how many representative particles you have of that substance. If there is no subscript, it is understood to be 1, which means you only have 1 representative particle of that substance. Examples: H2O, or water, means you have 2 hydrogen atoms and 1 oxygen atom. Ca(NO3)2, or calcium nitrate, means you have 1 calcium atom, and 2 nitrate polyatomics (comprised of a total of 2 nitrogens and 6 oxygens.) A subscript outside a set of parentheses distributes to everything in the parentheses.
