Which element is always found in impure form naturally

A. copper

B. nitrogen

C. aluminium

What might happen if a wire and electronic devices replace with a thinner longer wire

If the formation of NaCl proceeds according to the following equation and change in enthalpy, what is the reaction and change in enthalpy for the decomposition of 2 moles of NaCl? Na + ½Cl2→NaCl, ΔH = - 411 kJ

Which solution would make phenolphthalein turn pink? A Mg (OH) 2 B HCl C MgCl2 D H2S

Which of the following is not found in a lipid? A. glycerol B. carbon C. fatty-acids D. amino acids

What are the factor that affect the survival of the electron in the same orbit in the ground state of an atom?

A flexible container is filled with 960.0 liters of air at 38 degrees Celsius. If pressure in the container does not change, at what temperature will the container have at a volume of 350.0 liters?

Which subatomic particles are paired with their charges? 1. electron-positive, neutron-negative, proton-neutral 2. electron-negative, neutron-neutral, proton-positive 3. electron-negative, neutron-positive, proton-neutral 4.

Where do you think information is coded in a DNA molecule?

The mole fraction of carbon dioxide in a gas mixture is. 200 there are also. 251 g of nitrogen and. 322 g of oxygen in this gas mixture what is the mass of arbon dioxide in this mixture

How do you do empirical formula