Elements, Mixtures and compounds
Elements are made of tiny particles called..
Atoms
These are the ingredients of a reaction; they are on the left side of the arrow.
reactants
The subatomic particles (the parts of an atom.)
protons, neutrons, and electrons
Matter can neither be _____________ nor ______________.
created, destroyed OR made, lost.
This tells the number of protons in an atom.
atomic number
NaCl is an example of
a compound
A chemical reaction occurs when _______ rearrange to make new products.
atoms
The inner part of an atom, composed of protons and neutrons is called the...
nucleus
What is a balanced equation?
When the elements are equal on both side of the equation.
Anything that has mass and takes up space is
matter
Hydrogen and Neon are examples of
elements
A way to show how a chemical reaction happens...
chemical equation
The charge of an electron.
negative
The number placed below after a symbol in a chemical reaction is called
subscript
These cannot be broken down into simpler substances; everything around us is made up of combinations of them.
elements
Soil, salt water and air are examples of
mixtures
Every chemical reaction involves a change in
energy
What type of charge does an electron have?
no charge or neutral
List at least 3 indicators of a chemical change.
color change, gas is produced (smell or bubbles or fizz), a solid is formed, bright light or temperature change.
The study of matter and how it changes is called
chemistry
How could you separate salt from salt water?
heat it, boil it or let it evaporate. (Any one of these are correct!)
This kind of reaction absorbs energy (heat enters)
endothermic
What are electrons on the outer shell called?
valence electrons
The amount of matter stays the same in the reactants and products for ____________ chemical reactions.
all or every
The smallest unit of a compound is called
a molecule