In a covalently bonded molecule, the number of electrons that an atom shares with others is usually equal to the number of electrons ____________.
a) in the atom
a) in the atom
b) in its nucleus
c) in all the atoms
d) in its ion
e) needed to give it noble gas arrangement – e) needed to give it a noble gas arrangement.
base – substance which gives off hydroxide ions (OH-) in solution
Chemical Properties – Characteristic that cannot be observed without altering the substance
Hydrogenation – Conversion of oil into hardened fat by addition of hydrogen.
Benedicts solution did what – it turned monosacchrides orange
Alpha (α) radiation – a type of radioactive emission; a helium nucleus
Law of Conservation of Mass – in all physical and chemical changes, in a closed system, mass is constant
The gold foil experiment performed in Rutherford's lab….
According to the IUPAC nomenclature system, the types of compound that use prefixes in their names are – covalent compounds.
Molecule – a group of covalently bonded atoms with a fixed composition
law of conservation of mass – mass is neither created nor destroyed
How is aluminium extracted from its ore? – The ore (bauxite) is purified, giving aluminium oxide, which is mixed with cryolite. This gives it a lower melting point, so it is easier to melt. When molten, the aluminium oxide is separated by electrolysis. The positively charged aluminium ions gain electrons at the negative electrode, and become neutral aluminium atoms; the negatively charged oxygen ions lose electrons at the positive electrode, and become neutral oxygen atoms.
average atomic mass – the weighted average of the masses of all naturally occurring isotopes of an element
Density – the ratio of the mass of an object to its volume
The gоld fоil experiment perfоrmed in Rutherford's lаb….
back reaction – the reverse reaction of an equilibrium.
Elements – Pure substance that cannot be changed into simpler substances; composed of one type of atom.
Why do electrolytes affect colligative properties differently than do nonelectrolytes? – electrolytes produce more moles of solute particles per mole of solute