PLEASE THIS IS URGENT!! 1.) Write 2 points of difference between water molecule and hydrogen molecule.

2.) Differentiate between homogeneous and heterogeneous mixture.
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1.) Write 2 points of difference between water molecule and hydrogen molecule.

• Water molecule associates through hydrogen bonding while hydrogen molecule associates through weak vanderwaal's forces of attraction.

• Water molecule is heavier with greater molecular mass [ 18 grams ] than hydrogen molecule [ 2 grams ].

2.) Differentiate between homogeneous and heterogeneous mixture.

• Homogeneous mixture is a mixture where molecules combine uniformly and adhesive forces are greater than cohesive forces while heterogeneous mixture is a mixture where molecules are non-uniformly combined and cohesive forces are greater than adhesive forces.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.