MOLAR VOLUME LAB - prelab quiz

What is the main purpose of the 'Molar Volume of a Gas' experiment?

• To measure the mass of magnesium

• To calculate the volume of hydrogen gas at standard temperature and pressure

• To observe the color change in magnesium

• To determine the density of hydrochloric acid.

In the experiment, what is the role of the copper wire?

• To measure the temperature

• To anchor the magnesium ribbon

• To react with hydrochloric acid

• To measure the volume of gas.

Fill in the blank: The magnesium ribbon is approximately ___ cm long.

• 1

• 2

• 3

• 4

What safety equipment is emphasized in the procedure?

• Gloves

• Goggles

• Lab coat

• Ear plugs

How do you know a chemical reaction is occurring in the experiment?

• The solution changes color

• Bubbles form

• The temperature increases

• The magnesium ribbon turns black

Tags

NGSS.MS-PS1-2

Fill in the blank: After adding the 3M HCl to the gas collection tube, the tube should be filled to the top with _____.

• room temperature water from the wash bottle

• more HCl

• cold water from the faucet

• nothing

What is the concentration of HCl used in the experiment?

• 10mL

• 0.003 M

• 3 M... very strong!

• 4M... very very strong!

Tags

NGSS.HS-PS1-5

What should be done if there are bubbles in the gas-collection tube?

• Ignore them

• Tap the tube gently

• Add more water

• Remove the stopper

Fill in the blank: The stopper must be removed ___ the gas collection tube is inverted and submerged in the trough of water.

• A) Before

• B) After

• C) During

• D) While

When adding the 3M HCl to the gas collection tube, it important to

• stand the tube upright

• have the tube attached to the ring stand

• hold the tube at an angle and pour very slowly

• Invert the tube in the water