Atoms Ions and Molecules
Bonding
Periodic Table
Moles
Little Bit of Everything
100

Which is true about atoms? 

a) Atoms of any given element will differ from those of other elements

b) An atom will always display a positive charge

c) An atom will always display a negative charge

d) Atoms are made up of elements 

A

100

Name 2 difference between ionic and molecular substances? 

- Molecular compounds are electrically neutral while ionic compounds for ions 

- Ionic compounds have transferred  electrons while molecular has shared electrons 

- Ionic compounds tend to form lattice structures making them primarily solids, while molecule compounds can come in any state. 


100

Which in the following pair has the SMALLEST atomic radius? 

P or O 

O, Oxygen 



100

What equation is used to convert between moles, mass and molar mass. 

n= m/M

100

Name the following compound: 

NaBr

Sodium bromide

200

True or False 

Ions are always negatively charged

False, 

An ion is any atom that has gained or lost electrons changing its charge from neutral to either positive or negative.

200

Draw the lewis structure for CO2


200

Which element in the pair below has the larger ionization energy? 

Mg or F 

F



200

What equation is used to convert the number of moles to the number of atoms/molecules or units?

n = N/(N_A)

200

Name the following compound: 

PbO2

Lead (IV) Oxide 

Remember: Oxygen has a "charge" of 2 since, lead has no subscript on it, there must have been some sort of reduction! 

300

What is the difference between an ion and an isotope? 

Isotopes are a different number of neutrons (No change to over all charge) 

Ions are a different number of electrons (changes charge) 

300

Draw the lewis structure for NaF


300

Which of the following has the highest electronegativity?


Ge 

O, oxygen 


300

What is avogadro's number? 

6.02x10^23

300

What would be the formula for the following compound? 

sulfur hexafluoride

SF6

No prefix on sulfur means 1, hexa- means 6. 

400

How is the atomic mass of an atom developed? 

It is a weighted average of the masses of the elements isotopes based on their abundances. 

400

If potassium has an electronegativity of 0.82 and sulfur has an electronegativity of 2.58 what type of bonding is likely to occur? 

Ionic 


2.58 - 0.82 = 1.76 

400

These elements do not react easily with anything as they are already stable

Noble gases 

400

How many molecules are in one mole of water? 

6.02x10^23

400

If you are not given a total mass or molar mass when completing the empirical formula, what must you assume before you start? 

That you have 100g of the substance (this makes it easier when working with the percentages). 

500

The average atomic mass of magnesium is 24.305u. The element has three natural isotopes: 

magnesium-24 

magnesium-25

magnesium-26 

Which of the isotopes is likeliest to be in the greatest abundance? 

magnesium-24 

Since the average mass is 24.305u, this is closest to the isotope of magnesium-24; therefore it is most likely in the greatest abundance. 

500

What is the name of the forces that hold the molecules in molecular compounds together? 

Intermolecular forces

500

An element is a metal and reacts very easily with water. What family is this element most likely in? 

Group 1 elements, the alkali metals 

500

How many atoms are in 3 moles of carbon? 

1.81x10^24 

500

What is the main difference between an empirical formula and a molecular formula? 

Empirical is the simplest whole-number ratio (its reduced to its lowest form) 


Molecule formulas show the accurate number of each atom type in a molecule.