the reactants were used were vs the reactants were used are

Some examples from the web:

• 3:The gaseous reactants used in the out-of-pack process are produced using the same basic reactions and parameters as the pack cementation process, except that the substrate to be coated is not in contact with the powder mixture.
• The gaseous reactants used in the out-of-pack process are produced using the same basic reactions and parameters as the pack cementation process, except that the substrate to be coated is not in contact with the powder mixture.
• gaseous reactants used in the out-of-pack process are produced using the same basic reactions and parameters as the pack cementation process, except that the substrate to be coated is not in contact with the powder mixture.
• The reactant core is what allows this to happen...
• Thus the validity of the Bronsted-Debye-Huckel equation at low ionic strength has been amply tested, and the charges on the reactant ions are well known, if their reagents are properly characterised.
• ...were used in the incident on the bus.
• Available statistical sources, namely Eurostat were used.
• The discs you used were prototypes.
• Especially those in which cranes of European production were used.
• She also regretted that the candidate countries were used as "scapegoats" for the EU's failure to reach a common position on Iraq.
• During these confrontations between different gang members - or persons associated hereto - weapons were used on several occasions.
• Up to 60% the payment credits were used.
• 6,000 tonnes of dynamite were used to make it.
• Your iridium seeds were used by a killer.
• We believe those strings were used to tie Ron down.
• That were used to kill lindsay elding.
• You were used by the future, by Dennis Ryland.
• 2 million catties of metal were used.
• All these guns were used in the ambush today.
• Which suggests low-powder, low-velocity rounds were used.

Some examples from the web:

• 3:The gaseous reactants used in the out-of-pack process are produced using the same basic reactions and parameters as the pack cementation process, except that the substrate to be coated is not in contact with the powder mixture.
• The gaseous reactants used in the out-of-pack process are produced using the same basic reactions and parameters as the pack cementation process, except that the substrate to be coated is not in contact with the powder mixture.
• gaseous reactants used in the out-of-pack process are produced using the same basic reactions and parameters as the pack cementation process, except that the substrate to be coated is not in contact with the powder mixture.
• The reactant core is what allows this to happen...
• Thus the validity of the Bronsted-Debye-Huckel equation at low ionic strength has been amply tested, and the charges on the reactant ions are well known, if their reagents are properly characterised.
• ...were used in the incident on the bus.
• Available statistical sources, namely Eurostat were used.
• Especially those in which cranes of European production were used.
• Currently the biofuels most used are bioethanol and biodiesel.
• Definitions used are given in Appendix 1.
• She also regretted that the candidate countries were used as "scapegoats" for the EU's failure to reach a common position on Iraq.
• During these confrontations between different gang members - or persons associated hereto - weapons were used on several occasions.
• Up to 60% the payment credits were used.
• 6,000 tonnes of dynamite were used to make it.
• Your iridium seeds were used by a killer.
• We believe those strings were used to tie Ron down.
• That were used to kill lindsay elding.
• You were used by the future, by Dennis Ryland.
• 2 million catties of metal were used.
• All these guns were used in the ambush today.