Models
What atomic model shows all electrons orbiting the nucleus in specific energy levels or shells, looking a bit like a miniature solar system?
Bohr Model
What is the density formula?
Density=Mass/Volume?
Oxygen is odorless and colorless. Is this a chemical property or a physical property?
Physical
What are the rows of the periodic table called?
Periods.
What is an ion?
An atom that has gained or lost electrons affecting the net charge of the atom
Unlike a Bohr model, a Lewis dot structure only displays these specific electrons. What are they called?
Valence Electrons
If a block of wood has a mass of 20 g and a volume of 40 cm3. What is its density?
0.5 g/cm3
Combustibility, the ability to rust, and acidity are all examples of which property?
Chemical
Groups.
What is an isotope?
Atoms of the same element that have the same number of protons but different numbers of neutrons affecting the mass number.
What is the Bohr model for Boron?
Check Answer
Liquid A has a density of 1.2 g/mL and Liquid B has a density of 0.8 g/mL. If poured into the same jar, this liquid B will?
Float / Be on top of Liquid A
Boiling water, freezing juice, and cutting paper are ALL examples of chemical or physical changes?
Physical Changes
A Phosphorus atom has how many electrons?
15 e-
What type of ion does an atom become when it loses an electron?
It becomes a positively charged ion. A cation.
What is the Lewis Dot stricture for Bromine?
Check Answer.
A piece of copper has a known density of 8.9 g/cm3. If a scientist cuts a cube of this copper that has a total volume of 5 cm3, What is the total mass of the cube?
44.5g
What is the following property a chemical or physical property: Can only be observed by changing the identity of the substance and describe how a substance reacts
Chemical Property
Which group is known as the Alkaline Earth Metals?
Group 2
What is the mass number for potassium, K, isotope with 30 neutrons?
49
Draw a Bohr model for a Stable atom of Oxygen
Check answer.
The density of pure silver is 10.5 g/cm3. If a jeweler has a lump of pure silver with a mass of 84 grams, What is the volume?
8 cm3
What are the 5 signs of a chemical change?
Energy is released (heat or light produced), Change in smell, Change in color, Gas is produced (bubbles), Precipitate (solid) is produced
How many metalloids are there on the periodic table?
7
What is the number of each subatomic particle in chlorine-37?
17 protons, 17 electrons, and 20 neutrons.