Lab Chem Final

Conversions

100

205 grams to kilograms

.205 kilograms

200

2.3 kilograms to grams

2,300 grams

300

2.5 Kilometers to centimeters

250,000 centimeters

400

What is the following number in scientific notation?

24,300

2.43 x 10⁴

500

Convert 2.5 kilograms to grams then write in scientific notation

2.5 x 10³ grams

Naming

100

Na₂O

Sodium Oxide

200

Aluminum Chloride

AlCl₃

300

Fe₂O₃​​​​

Iron Oxide

400

Calcium Phosphide

Ca₃P₂

500

N₂O₃

Dinitrogen trioxide

Mole calculations

100

How many atoms are in 1 mole of Silver?

6.022 x 10²³

200

turn 8.5 grams of Iron into moles

.15 moles

300

Turn 3 moles of Calcium into grams

120.24 grams

400

How many atoms are in .45 moles of gold?

2.7 x 10²³ atoms of gold

500

How many atoms of gold are in 100 grams of gold?

3.06 x 10²³ atoms of gold in a 100 gram peice

atomic structure/theory

100

Atomic number always tells you number of _______

protons

200

Atoms with the same number of protons but different number of neutrons

isotopes

300

How many electrons does the element zinc contain?

30 electrons

400

How many neutrons does Uranium have if it is the isotope Uranium - 238

146 neutrons

500

How many protons, neutrons, and electrons does the following atom have:

Aluminum: Charge = +3 / Weight = 27 

13 protons, 10 electrons, 14 neutrons

Chem Basics

100

Melting ice is a ____________ change. 

Physical

200

Chemical or physical property:

Flammability

Chemical Property

300

What is the center of the atom made of and named?

Nucleus / protons + Neutrons

400

Groups on the periodic table indicate the number of __________ ___________ that an element has.

Valence Electrons

500

Why is the mass number not an even number on the periodic table?

It is the averages of all the isotopes of that element