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Two water molecules and a release of energy. This is how fuel cells work.

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Q: If there are two atoms of oxygen and four atoms of hydrogen before the reaction what will be true after the reaction?
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What do subscripts in chemical equations tell about the equation?

The subscript in the equation tells you how many atoms of that element there are in the reaction. For example: H20 --> H2 + O2 Before the reaction there are 2 hydrogen atoms and 1 oxygen (the subscript 1 isn't shown). After the reaction there are 2 hydrogen atoms and 2 oxygen atoms. Keep in mind that this is a skeleton equation and isn't balanced yet.


What is the ratio of hydrogen atoms before the reaction to after the reaction?

1:1 The number of atoms does not change in a reaction.


What order should atoms be balanced in a hydrocarbon combustion reaction?

Answer this question… Carbon, hydrogen, oxygen


If five atoms of hydrogen are reactants in a chemical reaction then how many atoms of hydrogen will be found in the products of that reaction?

Mass is conserved in a chemical reaction, so the mass before must equal the mass after. If you have five atoms before, you must have five atoms after.


What are the atoms in an ice cube?

H2O (hydrogen & oxygen).


In what order should atoms be balanced in a hydrocarbon combustion reaction?

Answer this question… Carbon, hydrogen, oxygen


How many atoms of oxygen are among the reactants in the equation or respiration?

There are two oxygen atoms in the reactant for hydrogen peroxide. It depends on the reactant.


Is oxygen and hydrogen the same?

Hydrogen and oxygen are two completely different elements. When combined in a chemical reaction, two hydrogen atoms (H2) combine one oxygen atom to form a molecule of water (H2O)


Why does Alex's equation better represent the reaction?

The number of oxygen atoms is the same before and after the reaction.


How many hydrogen atoms and oxygen atoms are in hydrogen peroxide?

Hydrogen peroxide has two atoms of hydrogen and oxygen.


What does a subscript in chemical reaction denote?

It denotes how much of that element there is. For example, in C2H3O2, there are two carbon atoms, 3 hydrogen atoms, and 2 oxygen atoms


Is this true when one burns hydrogen with oxygen to make water two oxygen atoms go into each water molecule?

No. When making water by burning Hydrogen in Oxygen (a very explosive reaction) is that 2 atoms of Hydrogen and 1 atom of Oxygen join together to form 1 water molecular - H2O.