Part a: we can determine the purity of solid materials by using calorimetry. a gold ring (for pure gold, specific heat = 0.1291 j⋅g−1⋅k−1 ) with mass of 10.5 g is heated to 78.3 ∘c and immersed in 50 g of 23.7 ∘c water in a constant-pressure calorimeter. the final temperature of the water is 31.0 ∘c.

Thus, the question would probably ask if the ring of gold is actually pure gold. For this, first there is a need to calculate the specific heat capacity of the calorimeter. If this equivalent to the specific heat for pure gold, then the gold ring is pure fold.

Qwater = mCdt = (50 g) × (4.18 J/gC) (31 - 23.7) = 1525.7 J

On the basis of conservation of energy,

Qwater = Qcalorimeter = mCdT = 1525.7

1525.7 = (10.5) (C) (78.3 - 31)

C = 3.072 J/gC

As the specific heat of the calorimeter is not equivalent to that of the pure gold (0.1291 J/gC), then the gold ring is not pure.

the answer is the

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.