Elements, Mixtures and compounds
The smallest unit of matter which has properties of a chemical element.
What is an atom?
These are the ingredients of a reaction; they are on the left side of the arrow.
What are reactants?
List at least 3 indicators of a chemical change.
What are color change, gas is produced (smell or bubbles or fizz), a solid is formed, bright light or temperature change, etc.
The study of matter and how it changes is called
What is chemistry?
NaCl is an example of this class of compounds.
What is a salt or ionic compound?
A process that involves the rearrangement of atoms to form new substances.
What is a chemical reaction?
The number placed below after a symbol in a chemical reaction is called
What is a subscript?
The number found in front of a Compounds is called.
Coefficient
Hydrogen and Neon are examples of what state of matter at room temperature.
What is a gas?
The symbolic representation of a chemical reaction using symbols and chemical formulas.
What is a chemical equation?
Matter can neither be _____________ nor ______________.
What is created, destroyed OR made, lost.
The smallest unit of a compound is called
What is a molecule?
Soil and air are examples of what type of material.
What are mixtures?
This kind of reaction absorbs energy. (Heat enters.)
What is endothermic?
In a ____________ system, all the matter stays inside.
What is closed?
These cannot be broken down into simpler substances; everything around us is made up of combinations of them.
What are elements or atoms?
How could you isolate salt from sea water?
What is heat it, boil it or let it evaporate. (Any one of these are correct!)
Every chemical reaction involves a change in
What is bonds, energy, etc.?
The amount of matter stays the same in the reactants and products for ____________ chemical reactions.
What is all or every.
Anything that has mass and takes up space is a kind of
What is matter?