Definitions
Anything that has mass and takes up space
What is the definition of matter?
An element that is the most common element in the Earth's crust after oxygen
What is silicon?
These two elements are the main components of sand
What are silicon and oxygen
molecules that have carbon as the main building block and are what living things are made of are called this
What is "organic"?
These ions are used to build the shells of sea creatures such as corals and shellfish
What are calcium ions Ca2+ and carbonate ions CO3 2-
the smallest unit of an element that maintains the chemical properties of that element
What is an atom
The most common element by mass in living things
What is Carbon?
What is iron
Living things need this element and get it when it is fixed by bacteria in the soil
What is nitrogen?
This compound and gas forms sulfuric acid when it reacts with oxygen and water in the atmosphere
What is sulfur dioxide SO2
found in the nucleus with a positive charge
What is a proton?
A positively charged particle in the nucleus
What is a proton?
These two elements in Group 1 of the Periodic Table are in common salts.
What are sodium Na and potassium K
All living things have a lot of this substance in them, which has two hydrogen atoms covalently bonded to oxygen
What is water
This element is one of the most common elements in both the Earth's crust and in living things
What is oxygen
found in the nucleus with no charge
What is a neutron?
What is sodium?
This key component of Earth's crust has the same number of valence electrons as magnesium but is smaller
What is magnesium Mg
Living things produce this molecule which has four hydrogen atoms covalently bonded to one carbon atom
What is methane
This element is found in the minerals hematite, magnetite, and greenalite
What is iron
found in a cloud outside the nucleus with a negative charge
What is an electron
The subatomic particle found in a covalent bond
What is the electron?
This key component of Earth's crust is found in limestone
What is calcium Ca
This molecule is released by the metabolism of all living things
What is carbon dioxide or water
The name of the structure formed by one Si atom and four O atoms
What is a tetrahedron