A pure substance is a substance that always has the same composition.
100
What is a physical property?
A physical property is any characteristic of a material that can be observed or measured without changing the composition of the substances in the materials.
100
How did Mendeleev arrange his periodic table?
Mendeleev arranged his periodic table into rows in order of increasing mass so that elements with the same property were in the same column.
100
What is atomic mass?
Atomic mass is a characteristic of an atom that is a measure of its size.
100
What do elements within a group have in common?
Elements within a group have the sam number of valence electrons.
200
What is the difference between an element and a compound?
An element is a substance using only one atom. It cannot be broken down into smaller substances.
A compound is made up of two or more simpler substances and can be broken down into smaller substances.
200
What is chemical property?
A chemical property is any ability to produce a change in the composition of matter.
200
How is the modern periodic table arranged?
In the modern periodic table, elements are arranged by increasing atomic number (number of protons).
200
What are the three categories the elements on the periodic table are classified as?
Metals, nonmetals, and metalloids.
200
In a period does the atomic mass increase or decrease from right to left?
The periods are in order of increasing mass from left to right, therefor it is decreasing from right to left.
300
What is a solution?
A solution is when a substance dissolves into another substance.
300
What are some examples of a chemical property?
Flammability, reactivity, change in color, production of gas, and formation of precipitate are all examples of chemical properties.
300
What are the columns in the periodic table called?
Groups are the columns in the table.
300
What are metals and where are the located?
Metals are elements that are good conductors of electric current and heat. Metals are located on the left of the periodic table.
300
***DAILY DOUBLE***
How long do koalas sleep every day?
Approximately 20 hours.
400
What is a suspension?
A suspension is a heterogeneous mixture that separates into layers over time.
400
What are some examples of physical properties?
Hardness, melting point, boiling point, density, malleability, and conductivity, and viscosity are some examples of physical properties.
400
What are the rows in the modern periodic table called?
Periods are the rows in the table.
400
What are metalloids and where are they located?
Metalloids are elements with properties that falls between those of metals and nonmetals. They are located between the metals and the nonmetals.
400
What does the group number represent?
The group number is the amount of valence electrons on the outer layer of the shell of an electron.
500
What is a colloid?
A colloid is made of small particles that does not separate into layers.
500
**DAILY DOUBLE**
What is the average length if a giraffes neck?
A giraffes neck is 6 feet long.
500
How did Dmitri Mendeleev decide to organize his periodic table?
He figured out how to organize the periodic table through a card game.
500
What are nonmetals and where are they located?
Nonmetals are elements that have low boiling points. Most are gases at room temperatures. They are located mostly on the right side of the periodic table except hydrogen.
500
Do elements become more or less metallic from left to right in the periodic table?
Across the period from left to right elements become less metallic and more nonmetallic in their properties.