Which gas in Earth's atmosphere protects Earth by reflecting untraviolet radiation? oxygen.

carbon dioxide.

ozone.

nitrogen.

Suppose that during that icy hot lab 65,000 j of energy were transferred to 450 g of water at 20°c what would have have been the final temperature of the water

Cucl2 + 2nano3 cu(no3)2 + 2nacl what is the percent yield of nacl if 31.0 g of cucl2 reacts with excess nano3 to produce 21.2 g of nacl? 49.7% 58.4% 63.6% 78.7%

Which element is the least metallic between cadmium, silver, zinc, or iron?