1. The energy required to remove one electron from an ion carrying a -1 charge is called...

Select one:
1. second electron affinity.
2. second ionization
energy.
3. first electron affinity.
4. first ionization energy

2. Sodium chloride is an ionic compound with the basic formula NaCI.
Which option describes the nature of sodium chloride?

1. It is crystal made from sodium and chloride atoms in 1:1 ratio
2. It is made up of molecules, each of which has one sodium and one chloride atom.
3. It is a crystal made from an inner core of sodium Atoms surrounding by chlorine atoms.
4. It is made up of individual sodium and chlorine atoms that are not connected to each other.

3. A sample of lithium sulfide has a twice as many lithium atoms as it had sulfur atoms.
If sulfur ions carry the charge of 2-, what is the charge of lithium ions?

For a family dinner, jose’s mom baked a loaf of bread. during the meal, his grandmother commented, “this bread is so dense! ” what do you think his grandmother meant by the word dense? you have some ideas regarding density already, but this experiment will enrich your understanding of the relationship between mass, volume and the density of objects. when making measurements in this experiment we will be using si units, the international system of units. the purpose of using si units is to have the ability to communicate and compare data results with other experiments without having to make conversions. measurement symbol si unit length m meter mass kg kilogram volume l liters density kg/l kilograms per liter any calculations that are performed during this experiment will ultimately be reported in scientific notation. recall that scientific notation is extremely important when we have data that is extremely small or large. scientists rely on a standard form of communication to quickly make hypotheses and judgements based on data. what is the density of block a? a0kg/l what is the density of block b? a1kg/l what is the density of block c? a2kg/l what is the density of block d? a3kg/l what is the density of block e? a4kg/l which block is the densest? a5