Answer:
18.066 x 10^23 atoms of Au
Explanation:
ONE mole = 6.022 x 10^23 particles
3 x 6.022 x 10^23
<span>All metals have similar properties BUT, there can be wide variations in melting point, boiling point, density, electrical conductivity and physical strength.<span>To explain the physical properties of metals like iron or sodium we need a more sophisticated picture than a simple particle model of atoms all lined up in close packed rows and layers, though this picture is correctly described as another example of a giant lattice held together by metallic bonding.</span><span>A giant metallic lattice – the <span>crystal lattice of metals consists of ions (NOT atoms) </span>surrounded by a 'sea of electrons' that form the giant lattice (2D diagram above right).</span><span>The outer electrons (–) from the original metal atoms are free to move around between the positive metal ions formed (+).</span><span>These 'free' or 'delocalised' electrons from the outer shell of the metal atoms are the 'electronic glue' holding the particles together.</span><span>There is a strong electrical force of attraction between these <span>free electrons </span>(mobile electrons or 'sea' of delocalised electrons)<span> (–)</span> and the 'immobile' positive metal ions (+) that form the giant lattice and this is the metallic bond. The attractive force acts in all directions.</span><span>Metallic bonding is not directional like covalent bonding, it is like ionic bonding in the sense that the force of attraction between the positive metal ions and the mobile electrons acts in every direction about the fixed (immobile) metal ions of the metal crystal lattice, but in ionic lattices none of the ions are mobile. a big difference between a metal bond and an ionic bond.</span><span>Metals can become weakened when repeatedly stressed and strained.<span><span>This can lead to faults developing in the metal structure called 'metal fatigue' or 'stress fractures'.</span><span>If the metal fatigue is significant it can lead to the collapse of a metal structure.</span></span></span></span>
Answer:
a) O²⁻ + H₂O <-----> OH⁻ + OH⁻
Acid = H₂O
Base = O²⁻
Conjugate Acid = OH⁻
Conjugate Base = OH⁻
b) HClO₄ + H₂SO₄ <-----> ClO₄⁻ + H₃SO₄⁺
Acid = HClO₄
Base = H₂SO₄
Conjugate Acid = H₃SO₄⁺
Conjugate Base = ClO₄⁻
c) NH₃ + HNO₃ <--> NH4⁺ + NO₃⁻
Acid = HNO₃
Base = NH₃
Conjugate Acid = NH4⁺
Conjugate Base = NO₃⁻
Explanation:
- Acids are molecules or ions capable of donating a proton (H⁺).
- Bases are molecules or ions that readily accept the H⁺ from acids.
- Conjugate Acids, according to the Brønsted–Lowry acid–base theory, are chemical compounds formed after the reception of a proton (H⁺) from an acid by a base.
- Conjugate Bases, Brønsted–Lowry acid–base theory, are the leftovers from when acids donate their proton (H⁺).
Answer: option c an electron has a negative charge and is located outside the nucleus revolving in circular path
