Atoms and Molecules
Building blocks of matter
What are atoms?
Reacts easily in a chemical reaction
What is reactive?
New product is created, energy is given off or used, and you can't change it back.
What is a chemical reaction?
Matter cannot be created or destroyed
What is the law of conservation of matter?
All synthetic materials come from these.
What are natural resources?
A collection of atoms bound together
What is a molecule
A property of gold that allows it to be used for jewlery.
What is malleable?
Only physical properties change.
What is a physical reaction?
In a chemical equation they are found after the arrow.
What are the products?
The atomic number is the same as this in elements on the periodic table.
What are protons?
A pure substance that cannot be broken down into smaller component
What is an element?
How closely packed particles in matter are
What is density?
Rust, digestion, and photosynthesis are all examples of this.
What is a chemical reaction?
In 2NH4NO3 → 2N2 + O2 + 4H2O, they are 2NH4NO3
What are the reactants?
This is why ice floats on water.
What is less dense?
Protons and neutrons
What is contained in the nucleus of an atom?
Examples of this property include color, odor, phase, and mass.
What is a physical property?
Boiling water and dissolving are examples of this.
What are physical reactions?
In this equation: C2H6 + O2 → CO2 + H2O, they are O2 → CO2 + H2O
What are products?
The transfer of electrons
What is static electricity?
Equals the atomic mass minus the number of protons
What is neutron?
This group on the period table is defined as colorless, odorless gases that do not react.
What are the noble gases?
This is what happens to molecules in a chemical reaction.
What is rearrange?
Both sides of the reaction have the same number of atoms.
What is a chemical equation showing the conservation of matter?
The molecules do not move much, and are tightly packed together
What is a solid?