I just need 4-8! Plz hurry

A+b→2c when the reaction begins, the researcher records that the rate of reaction is such that 1 mole of a is consumed per minute. after making changes to the reaction, the researcher notes that 2 moles of a are consumed per minute. what change could the researcher have made to effect this change?

Need on both questionswill markbr />

Match the mixture with the substance// i really need on this guys (it’s a pic btw)