Why is hydrogen a light gas, but iron is a heavy solid

Which of the following is a characteristic of a mixture? a) can have varying properties b) has a fixed composition c) contains no pure substances d) both a and b

Which of the following processes is exothermic? a. The reaction associated with DH°f for an ionic compound the ionization of a lithium atom. b. The sublimation of dry ice (CO2 (s)) c. The breaking of a Cl-Cl bond d.

Which example best represents balanced forces?

An unknown solution turned red litmus paper red, turned blue litmus paper blue, and didn't conduct electricity. The solution is most likely ... a Basic b Acidic c Neutral d Not enough information to determine

Which part of this map is the subregion europe

According to Table I, which equation represents a change resulting in the greatest quantity of energy released? 1. 2C (s) + 2H2 (g) - > C2H4 (g) 2. 2C (s) + 3H2 (g) - > C2H6 (g) 3. N2 (g) + 3H2 (g) - >2NH3 (g) 4. N2 (g) + O2 (g) - > 2NO (g)

Calculate the number of liters in 3.25 g of ammonia

Adding drops of food coloring to a beaker of water more organized system?

Some chemical hazards are physical and some are related to the potential health effects of exposure. Click only one box for each response Toxicity Carcinogenic Flames Inhalation hazard Flying objects

Which would be best categorized as heat transfer by convection? A) Wearing a white shirt to stay cool on a summer day.