An ionic bond would most likely form between atoms of which of these pairs?

A. oxygen and oxygen

B. magnesium and oxygen

C. magnesium and magnesium

The orbits of the planets are ellipses with the sun at one focus

the solubility in mol/dm3 of 20.2g of potassium trioxonitrate (V) dissolved in 100g of water at room temperature is

Molecules of two substances at the same temperature have the same: A) average kinetic energy. B) heat content. C) distance between the molecules. D) average potential energy.

The nucleus of an atom ok K-42 contains

A scientist mines and processes a nonrenewable resource and obtains copper, which is a metal element. Which resource is the scientist most likely working with? coal ores petroleum natural gas

Give reason: a. Fractionating columns with beads are used for fractional distillation b. Crystallisation is a better technique than evaporation

How can a gardener remedy soil that is overly acidic?

True or false everything has the same amount of energy?

4NH3 (g) + 502 (g) - >6H20g) + 4NOg) What is the enthalpy change for this reaction?

What diseases have increased public awareness of infection control over the past few years?