Elements
What is an element?
A pure substance that cannot be broken down into simpler substances.
What is a compound?
A substance made of two or more different kinds of atoms bound together.
What elements are represented in the formula H₂O?
Answer: Hydrogen and Oxygen.
What does the periodic table represent?
The organized list of all known elements.
What is the main element in the biosphere?
Oxygen, nitrogen, hydrogen, and carbon
What is the smallest particle of an element?
An atom.
How are compounds represented?
By a chemical formula.
Identify the elements in the formula CO₂.
Carbon and Oxygen.
How many letters can a chemical symbol have?
One or two letters.
Which two elements are primarily found in Earth's oceans?
Give an example of an element represented by a one-letter chemical symbol
Hydrogen (H) or any other element like O for Oxygen.
Name the two elements that make up water.
Hydrogen (H) and Oxygen (O).
What elements are present in the formula NaCl?
Sodium and Chlorine.
What element is represented by the symbol Si?
Silicon.
Name an element that is abundant in the Earth's atmosphere.
Nitrogen.
What makes elements considered pure substances?
They are made of only one kind of atom and have consistent properties.
What is a common compound found in living matter?
Carbon dioxide (CO₂) or glucose (C₆H₁₂O₆).
Which elements are represented in the formula C₆H₁₂O₆?
Carbon, Hydrogen, and Oxygen.
Where is the atomic number located on the periodic table box?
It is typically located at the top of the box containing the element's symbol.
What elements are primarily found in the lithosphere?
Oxygen and Silicon.
What is the primary element that makes up the Earth's lithosphere?
Oxygen.
What is the difference between an element and a compound?
An element consists of only one type of atom, while a compound consists of two or more types of atoms.
Identify the elements in the formula CaCO₃.
Calcium, Carbon, and Oxygen.
What is the number located under the name of the element on the periodic table box?
It represents the atomic mass of the element.
How many elements primarily make up living matter?
Six elements: Oxygen, Carbon, Hydrogen, Nitrogen, Calcium, and Phosphorus.