Yes, you can. Scapegoat is a Quickplay Spell card, so its activation can be chained to another Quickplay Spell card, such as Mystical Space Typhoon.
Cards resolve in the opposite order that they are activated in. So, your Mystical Space Typhoon will be chain link 1, and their Trap will be chain link 2. That means their trap will resolve first, and MST will resolve afterwards.
The targeted card is free to be activated in chain to MST as long as it's spell speed 2, or 3.
yes, but it would be useless to do that. you would be better off to wait for a better card
as of 2011, mystical space typhoon has been switched to semi-limited.(Link to Limited and Forbidden Lists: http:/www.yugioh-card.com/en/limited/#limited_trd)
No, it can never do that. It has an Ignition Effect (spell speed 1) and can only target face-up cards. So that means it can't do anything to those cards while they are face-down, and when they do activate, Alector can't chain his effect to them. Basically his effect is used against active Continuous Spell cards, as well as Field Spells and Equip Spells.
You will resolve the chain in reverse order. Scapegoat will summon the four 'Sheep Tokens' but its card will remain on the field for a moment. Resolved cards on the chain only go to the graveyard after the whole chain has resolved, or, when something destroys them. Mystical Space Typhoon's effect will resolve next, destroying the Scapegoat card and sending it to the graveyard. Lastly Mystical Space Typhoon's card will go to the graveyard.
Mystical Space Typhoon will still resolve fully, but Scapegoat will have resolved first, before it did so. Mystical Space Typhoon is not a negation card, all it does is destroy a target, and in this situation, it did just that. It would not be accurate to say Mystical Space Typhoon has 'no effect' here because it did still resolve fully. If any card looked for spell card resolutions, or card destruction, the above scenario would trigger them. However apart from that, the Mystical Space Typhoon is doing nothing more than destroying a card that was about to go to the graveyard already.
Yes, Quickplay Spells such as Mystical Space Typhoon can be chained from hand, on your own turn only. If you want to activate them in the opponent's turn, they must have been Set on a previous turn.
Yes. Mystical Space Typhoon destroys its target. Destroy is a specific kind of send, so will satisfy Hysteric Sign's activation condition.
Cards resolve in the opposite order that they are activated in. So, your Mystical Space Typhoon will be chain link 1, and their Trap will be chain link 2. That means their trap will resolve first, and MST will resolve afterwards.
The targeted card is free to be activated in chain to MST as long as it's spell speed 2, or 3.
If the controller of Reinforcements has a monster face-up on the field, you can chain Reinforcements to Mystical Space Typhoon, because both Reinforcements and Mystical Space Typhoon are Spell Speed 2.
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No, Quickplay Spell Cards must be Set on the field on a previous turn, if you wish to activate them during the opponent's turn.
Mystical Space Typhoon Heavy Storm Dust Tornado You can simply activate a new Field Spell to destroy any currently active one.
yes, but it would be useless to do that. you would be better off to wait for a better card
Yes. Infestation Infection is spell speed 2 meaning the card can be flipped face-up in chain to another effect, and its reusable effect can be chained to things also. You can even perform both at the same time as a single link if it was face-down to begin with. 1 - If Infestation Infection is already active, then it can chain its effect to Mystical Space Typhoon. 2 - If Infestation Infection is face-down, then it can flip face up and activate its effect in chain to Mystical Space Typhoon.