- Why does an impurity reduce the melting point range of a pure compound?

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How long do the batteries in Beats executives last? If the earth is truly spherical, why do we not feel like we are standing upside down or sideways on the earth? i need answers please.? How many degrees of strog base and strog acid? If 5sinθ = 3 determine the value of:
1. cos (θ-360)
2. Tan (squared)θ
3. Sin θ x cos θ (all divided by cos (squared θ)? A reaction produced 52.1 g of kcl how much o2 was produced in grams?