Forms of matter
Molecules are tightly packed and tremble slightly
Solid
If a chemical reaction gives off heat to its surroundings, it is a _________ reaction.
Exothermic
This cannot be broken down into something simpler?
Element
The degree of compactness of a substance.
Density
Using a mortar to grind a solid to a fine powder is an example of what kind of change?
Physical
The process of adding thermal energy to a solid until it is liquid is..
Melting
When I tear a piece of paper in half, a chemical change occurs.
False
This is often times said to seem "like a recipe."
Chemical Formula
The amount of matter in a substance.
Mass
In our Balloon lab what occurred?
Chemical reaction that produced a gas
Molecules are loosely together and slide past each other
Liquid
_________ are physically combined and can be easily separated.
Mixtures
What can you find on the periodic table?
Elements
Pertains to the three-dimensional space that is occupied by an object (
Volume
How does a catalyst affect a chemical reaction?Your answer
It makes it start
Molecules are scattered,attempting to disperse and move very rapidly.
Gas
The Law of Conservation of Mass states: "Matter cannot be created or destroyed. It can only be ________ to form new products"
Rearranged
How many elements are there on the periodic table?
118
The Formula for density
Density equals Mass over Volume
What is the chemical formula for table salt?
NaCl
When enough thermal energy is removed from this form it becomes a solid
liquid
If a chemical reaction takes in heat from its surroundings, it is a _________ reaction.
Endothermic
What does a subscript tell you?
The number of atoms of a particular element that are in a compound
Why does the mass of a substance remain the same after a chemical reaction?
Law of Conservation
Give an example of a chemical reaction during which a single substance breaks down.
Open