Which of the following is most likely a chemical reaction? Group of answer choices

Two solid powders are combined and shaken. The substances form a mixture.

A solid is stirred into a liquid solution. The temperature of the solution decreases.

Three liquids are poured into a beaker and swirled. One of the liquids settles at the bottom.

A liquid is heated until it reaches its boiling point. Vapor is created.

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

What is the relation between concentration of reactants and the rate of chemical reaction?

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.