Element Classification
Describe the properties of metals and give two examples.
Good conductors, luster, shiny, high melting / boiling point.... etc.
What are the elements and their amounts CO₂ in this chemical formula?
carbon-1, oxygen-2
Define a compound and provide an example.
chemically bonded atoms / H2O
What period and group is oxygen found in?
Period 2, Group 16
What is the meaning of a subscript in a chemical formula?
How many atoms of that type of element.
Explain why metalloids are often used in computer chips.
Semi conductors / only allowing a certain amount of heat to transfer
If a molecule has the formula (NH₄)₃PO₄, how many hydrogen atoms are present?
12 hydrogen atoms
How is a compound different from an element?
Elements are pure, compounds are made up of multiple elements / atoms
Using the periodic table, find the symbol and atomic number for Strontium.
Sr, 38
How many elements are in MgCl₂?
2
What do nonmetals typically have in common?
Brittle, poor conductors, dull, low melting / boiling
Explain how you can tell the difference between different elements in a chemical formula.
Capital letters / subscripts
Give two examples of different “pure substances”.
Oxygen, carbon, hydrogen, etc
Elements that are found on the zigzag line of the periodic table are known as….
Metalloids
How many total atoms are in the following compound? 11CH₃
44
What are metals good conductors of?
Heat AND electricity
What are the elements and amount of each in this chemical formula:
NaAlSi₃O₈?
Sodium-1, Aluminium-1, Silicon-3, Oxygen-8
Why is Fe a pure substance while FeO is a compound?
Fe is alone, FeO is a compound / bonded with other
What is the most reactive group on the periodic table?
Group #1 / Alkali Metals
How many total molecules are in the following compound? 11CH₃
11
What does it mean if an element is malleable and has a shiny luster?
It can be bent into shape and is shiny / a metal
How many total atoms are there in the following compound:
(NH₄)₃PO₄
20 atoms
How many elements and atoms are in the following compound: Na₂SO₄
3 elements, 7 atoms
What are the characteristics of noble gases compared to alkali metals?
stable, gas are room temp, unresponsive, etc.
Find the total number of atoms in Al(OH)₃
7