pure substance x is a green powder. when heated, it gives off a gas and changes to a black powder. is substance x an element or a compound? give reasons

What is hybridization of electron orbitals? Hybridization of electron orbitals occurs when several atomic orbitals (such as s and p orbitals) of an atom combine to form (the same number of) new, hybrid orbitals.

Four atoms are arbitrarily labeled D, E, F, and G. Their electronegativities are as follows: D = 3.8, E = 3.3, F = 2.8, and G = 1.3.

Do siblings have genetic information in common?

1. Which elements are known as d-block elements? transition metals alkali earth metals halogens alkali metals

Number that indicates how many electrons an atom must gain lose or share to become stable

Action - reaction forces don't cancel each other. A. True B. False

An equilibrium is dynamic. True False

In a lab, a student dissolves 6.9 g of sodium chloride (NaCl) in 125 g of water (H2O). What is the molality concentration of the solution?

Audrey is driving 50 miles in 2 hours what is her average speed?

Water has a specific heat of 4184 J / (kgK) how much energy is needed to increase the temperature os a kilogram of water 5C?