Which equation is balanced?

(a) 2al+3o2→al2o3

(b) mg+o2→2mgo

(c) 2al+f2→2alf3

(d) 2na+f2→2naf

(D) 2Na+F₂ → 2NaF

Explanation:

The option D is correct because only this equation is balanced.

(D) 2Na+F₂ → 2NaF

There are two atoms of sodium and and fluorine are present on both side of equation so it is balanced. while

(A) 2Al+3O₂  →  Al₂O₃

There are two aluminium and six oxygen atoms are present on left side while two aluminium and three oxygen atoms are on right side. So equation is not balanced.

(B) Mg+O₂  → 2MgO

There are one magnesium atom and two oxygen atom on left side while two magnesium and two oxygen on right side. So equation is not balanced

(C) 2Al + F₂ →  2AlF₃

There are two aluminium and two fluorine atom on left side while two aluminium and six fluorine on right side. So equation is not balanced.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )

bcde is the incorrect answer it is a