Briefly, to those of you who do not know, a Consecrated Host... the Holy Eucharist... is the Body, Blood, Soul and Divinity of Our Lord Jesus Christ. This is a truth of the Catholic Church.
Therefore, even the tiniest speck (particle) of a Consecrated Host contains the Body, Blood, Soul and Divinity of Jesus Christ. I like to use the analogy of a mirror to explain this. If a mirror is broken, even the tiniest piece of the mirror would show the entire reflection of a person or object. The same is true with the tiniest particle of a Consecrated Host.
I'd like to share the following video with you because it is self-explanatory regarding Consecrated Hosts and receiving Holy Communion in the hand.
Is it any wonder that our Holy Father, Pope Benedict XVI gives Holy Communion to those who are kneeling and who receive on the tongue?
It would be a good thing to read Redemptionis Sacramentum's CHAPTER IV Holy Communion 1. Dispositions for the Reception of Holy Communion carefully.
"...92. Although each of the faithful always has the right to receive Holy Communion on the tongue, at his choice, 178 if any communicant should wish to receive the Sacrament in the hand, in areas where the Bishops’ Conference with the recognitio of the Apostolic See has given permission, the sacred host is to be administered to him or her. However, special care should be taken to ensure that the host is consumed by the communicant in the presence of the minister, so that no one goes away carrying the Eucharistic species in his hand. If there is a risk of profanation, then Holy Communion should not be given in the hand to the faithful.179..."