My test had 20 questions, i had 5 wrong out of 20 but there was also a back side with 20 more points.

My test had 20 questions, i had 5 wrong out of 20 but there was also a back side with 20 more points. 10 points was to do a redox reaction right and 10 more points for chemical naming. If i had 3 chemical naming wrong and the redox COMPLETELY wrong. what with my grade be?

On the front you got 75%. On the back you got 35%.

The actual score depends on the weight of the questions on the front. If they are 1 pt each, you got 55%, which is a failing grade, if the scores aren't weighted. But if the ones on the front are 4 pts each, so the entire test is worth 100 pts, then you got 65%, which is a D.

Study more, or ask your teacher for help. You need it.

Front of test = 15pts (out of 20 possible pts)

Back of test:
Redox = 0 pts (out of 10 possible pts)
chemical naming = ? pts (out of 10 possible pts)

You don't say how many chemical namings you had to do.
Was it 5, with each one worth 2 pts?
In that case, you got 2 out of 5 right with total points = 4/10
Was it 10, with each one worth 1 pt?
In that case, you got 7 out of 10 right, with total points = 7/10

I'll assume it was the latter, in which case final score
= (15+7)/40
= 22/40
= 55%

Ματπmφm

Your test had 40 points altogether. On the front, you got 15 points. On the back, you got 7 points. Altogether, you got 22 out of 40 points. 22/40=0.55. You grade is 55%.