PROCEDURE and Safety Notes: The hydrochloric acid used in this experiment can da

Question

PROCEDURE and Safety Notes: The hydrochloric acid used in this experiment can damage your eyes skin. Wear safety goggles at all times during this lab. If acid splashes into your eyes, use the eyewash station for a minimum of fifteen minutes, followed by evaluation by a physician. If acid splashes on your skin, wash it off immediately with cool water while your ab partner notifies your instructor. If you spill any acid on the bench or floor, notify your lab will neutralize it with sodium bicarbonate. The hydrogen gas generated in is flammable when exposed to oxygen. Do not use any flames during this instructor who experiment PART I: SETTING UP YOUR CYLINDER Collect a Fill the trough with water until it is about -2 cm from the top Attach the clamp to the ring stand. Completely submerge the graduated cylinder in the water trough and tilt the opening slightly upward to get rid of any trapped air bubbles. trough, a 100-mL graduated cylinder, a ring stand and clamp. Once the cylinder is full of water, invert it in the trough without allowing the top to surface. This will keep the water in the cylinder and you should have no trapped air While holding the cylinder in place, clamp it to the ring stand for support. Be sure the top of the cylinder remains below the surface of the water STOICHIOMETRY OF REACTIONS-GAS EVOLUTION

Explanation / Answer

1)

If y-intercept in regression line should be zero, then we are assuming the starting level, i.e. then x = 0, then y = 0 as well

This is due to the fact that, natuarlly, there is NO initial amount of y s x = 0.

then

the equation shows

y = m*x + b

when x = 0, then y = 0

so

0 = m*0 + b

b = 0

2)

R-square is a statistical measure of how close the data are to the fitted regression line.

It is also known as the coefficient of determination, or the coefficient of multiple determination for multiple regression

R-squared = Explained variation / Total variation

R-squared is always between 0 and 100%:

The higher the R-squared, the better the model fits your data.

3)

Hydrogen generation and the reaction depends on the concentration of the Acid.

According to the question here useing 10 mL rather than 20 mL means the concentration of the Acid is not changed only the quantity or equivalents or moles are changed.

So, the reaction takes place and the hydrogen generation (product formation) is less (less number of moles) and can seen the some portion of unreacted metal.

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