What is the ratio of carbon atoms to oxygen atoms in co2

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)

Why does his teacher ask him to balance the equation by including the correct coefficient

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains