Which of the following chemical equations is balanced?

A. H2 + Cl2 4HCl

B. 4H2 + 2O2 2H2O

C. 4Fe + 3O2 2Fe2O3

D. 2Fe + HCl FeCl2 + H2

The law of conservation of energy describes how the amount of total energy can change in a closed system.

We use batteries every day to play radios, iPhones, video games, and even our car. But although batteries are a convenient technology, but they can cause problems for life on Earth. Batteries cause problems in all BUT one way.

Which of the following tissues is responsible for transporting carbohydrates synthesized in the leaf to the rest of the plant?

Which safety precaution is common to ALL laboratory activities? A) Wear a lab apron. B) Follow Instructions. C) Disinfection of the lab bench. D) Disposal of materials into hazardous waste containers.

Begins at the edge or the continental shelf

The Manx mutation, which produces no tail in cats, is a recessive lethal. What phenotype ratios would be expected from a cross between two Manx cats? A. ¾ Manx: ¼ normalB. ¾ normal: ¼ ManxC. ⅔ Manx : ⅓ normalD. All Manx

Energy that flows from object with a higher temperature to a object with a lower temperature is

After a newborn has skin-to-skin contact with the mother, the nurse places the newborn under a radiant warmer. which complication is the nurse attempting to prevent?

Marks: 1 the circulatory movement that occurs in a gas or fluid with areas of differing temperatures due to the variation of the density and the action of gravity is called:

there is 30 percent more what in earth's atmosphere today than there was before the start of the industrial revolution