Interpreting atomic-scale depictions

Which of the following images best represents the structure of NaCl after dissolution?

Note that atomic radius has not been taken into account for the following images.

Mass calculation

Assuming you had 0.013 moles of copper chloride, what amount of 4 M NaOH would be the minimum volume you could use in Section 2.1 of Exercise 3?

State your answer in millilitres but remember SI units are litres. Report to one decimal place. Do not include units with your answer.

The Analytical Balance Room

• The room in the centre of the 1st Year laboratories houses our analytical balances.
• Analytical balances are highly sensitive and can measure masses to the microgram.
• To maintain their accuracy, the balances are serviced and calibrated annually.

Figure 1: Analytical balance

To ensure the analytical balances are kept in working order we must:

• Prevent solids or liquids from getting under the balance pan (to avoid corrosion and mechanical interference). Contamination under the pan can cause significant damage, costing thousands of dollars in repairs!!
• Ensure the electronics remain in good condition by never operating an analytical balance while wearing gloves.

From the list below, select the items that should not be worn or taken into the analytical balance room.

Mole calculation

If you add 10.0 mL of 1.9 M NaOH, how many moles of NaOH would that be? You will need to calculate it using n = cv. Report your figure to two decimal places.

(If you are struggling with some of the maths in Chemistry there is a lot of help. See the maths hub on Moodle and talk to you TA or unit coordinator to find support.)

How can you know that during the practical session the amount of NaOH you will use to convert Cu²⁺ to Cu(OH)₂ will be in excess?

¿Cuál es uno de los aspectos importantes a considerar al determinar la vista principal en un sistema multi-vistas según el texto proporcionado?