Question

What type of change is shown by the following:



2H2O2 = 2H2O + O2

H2O2 (hydrogen peroxide molecule)
H2O (water molecule)
O2oxygen molecule
Group of answer choices

both A and B

B. chemical change

none of these options

A. physical change

Answer 1

1. H2O2 (hydrogen peroxide molecule)
2. both A and B
3. none of these options

Answer 2

Answer: H2O ( 1 oxygen & 2 oxyegen atoms)

H2O is the molecular formula of water, also called Dihydrogen monoxide. H2O symbolises two hydrogen atoms and one oxygen atom.

How h2o is formed?

For example, when hydrogen gas, H2(g), is burned in the presence of gaseous oxygen, O2(g), a new substance, liquid water, H2O(l ), forms. The covalent bonds within the H2 molecules and O2 molecules break, and new covalent bonds form between oxygen atoms and hydrogen atoms (Figure 7.1). ese covalent bonds break.

H. 2. O is the chemical formula for water, meaning that each of its molecules contains one oxygen and two hydrogen atoms. H.The chemical formula of water is H2O. It is also called dihydrogen monoxide. The 2 is the subscript for H symbolises the presence of 2 Hydrogen atoms.A physical change is any change in a

substance’s form that does not change

its chemical makeup. Examples of

physical changes are breaking a stick or

melting ice.

A chemical change, or chemical reaction,

occurs when atoms of a substance are

rearranged, and the bonds between the

atoms are broken or formed. During a

chemical reaction, the structure or

composition of the materials change.

When a chemical change is complete, the

resulting substance(s) is/are different from

the original substance(s). As a result of a

chemical reaction, new substances with

new properties are formed.