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Explain how you know a chemical reaction occurred between the two solutions, calcium chloride and sodium sulfate?

Answer 1

Because of the formation of an insoluble precipitate....

Chemical change is characterized by the formation of new substances, and the making and breaking of strong chemical bonds...when an aqueous solution of calcium chloride mixes with an aqueous solution of sodium sulfate, we could describe the reaction by the following equation....

#CaCl_2(aq) + Na_2SO_4(aq) rarr CaSO_4(s)darr + 2NaCl(aq)#

We would probably observe the precipitate of a fine white salt of (moderately insoluble) calcium sulfate...a clear signal of chemical change....

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.