Which of the following is not an indication of a chemical reaction?

A) a substance dissolves

B) formation of a precipitate

C) color change

D) the container gets cold

Consider the following reaction, for which ∆H° = + 87.9 kJ/mol and ∆S° = + 170.2 J/mol·K. PCl5 (g) → PCl3 (g) + Cl2 (g) Assume ∆H° and ∆S° do not vary appreciably with change in temperature.

Is the equation above balanced? How do you know? Mg + 2HCl → MgCl2 + H2

What does asexual reproduction mean?

For each of the following species, determine the number of protons and the number of neutrons in the nucleus: 3He2, 4He2, 24Mg12,25Mg12,48Ti22, 79Br35, 195Pt78

What are some true statements about light

You need to make an aqueous solution of 0.223 M barium bromide for an experiment in the lab, using a 250 mL volumetric flask. How much solid barium bromide should you add?

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How many moles of al2o3 are formed when 0.78 mol o2 reacts with aluminum?

The dissociation of a weak electrolyte is suppressed when

There are seven major levels of classification. Kingdom and Phylum are just two of the levels. Which of the following are also major levels of classification? Choose all answers that are correct. A. Class B. Order C. Family D. Level