'Chance' in the Bible

If by chance there are fifty upright men in the town, will you give the place to destruction and not have mercy on it because of the fifty upright men?

If by chance there are five less than fifty upright men, will you give up all the town to destruction because of these five? And he said, I will not give it to destruction if there are forty-five.

And again he said to him, By chance there may be forty there. And he said, I will not do it if there are forty.

And he said, O let not the Lord be angry and I will say only one word more: by chance there may be ten there. And he said, I will have mercy because of the ten.

And the servant said, If by chance the woman will not come with me into this land, am I to take your son back again to the land from which you came?

If by chance my father puts his hand on me, it will seem to him that I am tricking him, and he will put a curse on me in place of a blessing.