Question

please help guys!tomorrow is my exam. ​

Answer 1

Answer:

1 nao2

2 it would be cu+feso4

Answer 2

Answer:

1. $4na \: + o2 = 2 \: na2o$
2. $fe \: + cuso4 = feso4 \: + cu$
3. $2k \: + 2h2o \: = 2koh \: + h2$
4. $2al \: + 6hcl \: = 2alcl3 \: + 3h2$
5. $mgo \: + 2h2o \: = mg(oh)2 \: + h2o$