Which of the reactions below is a formation reaction? 1. 2 fe (s) + 3 o (g) → fe2o3 (s) 2. n2 (g) + 2 h2 (g) + 1 2 o2 (g) → n2h4o (g) 3. b2 (s) + 2 i2 (ℓ) + cl2 (g) → 2 bi2cl (g) 4. cdiamond (s) + 1 2 o2 (g) → co (g) ?

How many different elements have scientists discovered? 12, 112, 118, or more than 500?

The elements that contain electrons in an F sublevel near the highest occupied energy level are referred to as? A. Alkali metals B. Alkali earth metals C. transition metals D. inner transmission levels

What is the molar mass of pb (so4) 2 and how?

Reaction of ammonia and hydrogen chloride

The specific heat capacity of oxygen is 918 J/kg °C. The specific heat capacity of water is 4181 J/kg °C. Which substance will require more energy to raise its temperature by 1°C?

Amber has developed a line of organic lotions and handmade soaps with unique, herb-based scents and a touch of bee balm. She plans to sell these products to the wealthy residents of a nearby resort town.

Two pure elements react to form a compound. One element is an alkali metal, X, and the other element is a halogen, Z. Which of the following is the most valid scientific claim that can be made about the compound? a. It has the formula XZ2 b.

Are protons positive and neutrons neutral

Why might it be useful to determine the elements that a planet or moon is made up of?

Which of these is an example of a solution A Sand stirred in water B Sugar stirred in tea C A glass of water with ice in it D Oil and vinegar in a salad dressing jar