Which of the following reactions is balanced?
O A. CaCl2 + 2H2CO3 → Cacoz + HCI
O B. CaCl2 + H2CO3 → 2CaCO3 + HCI
O C. CaCl2 + H2CO3 -> CaCo3 + HCI
O D. CaCl2 + H2CO3 → CaCo3 + 2HCI

What happens when light is scattered?

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

Acm ruler with main graduations from 1 to 10 from left to right there are 10 secondary graduations between each of the main graduations there is a line that begins. at the left end of the ruler 10 secondary graduations to the left of the “1 main graduation the right end of the line ends on the eighth secondary graduation to the right of 3 how long is the line