What evidence did you have that adding concentrated HC lot powdered magnesium wa

Question

What evidence did you have that adding concentrated HC lot powdered magnesium was a chemical and not a physical reaction? Five cm^3 of liquid A has a mass of 4.0g. Five cm^3 of liquid B has a mass of 5.0g. Which liquid has a greater density? Explain your answer. 250 students take a chemistry exam. Their average grade is 85 with a standard deviation of 5 What range of grades would include 67% of all students who have taken this exam' Mean +/A- 1 sigma = 67% of students Mean +/- 2 sigma = 95% of students

Explanation / Answer

23)

When HCl is added to powered Mg , then the following reaction happens.

2 HCl + Mg -----> MgCl2 + H2

Liberation of H2 gas takes place, and you can observe using flame test. Which is the chemical reaction not any physical reaction.

24)

Density of liquid A = Mass of A / volume of A = 4 g / 5 cm3   = 0.8 g/cm3

Density of liquid B = Mass of B / volume of B = 5 g / 5 cm3   = 1 g/cm3

So, the density of B is greater than that of A

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