States of Matter
What are the states of matter?
Solid, liquid, and gas
what is an acid?
containing acid or having the properties of an acid; having a pH of less than 7
What is an endothermic reaction?
How many elements are on the periodic table?
there are 118 chemical elements on the periodic table
How is a chemical change different than a physical change?
In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed.
what is the most common state of matter in the universe?
plasma
what is the strength of an acid or a base called?
It is called Acidity
what is an exothermic reaction?
Exothermic reactions release heat and need less energy to break bonds in the reactants than is released when new bonds form in the products.
can elements be broken down?
Elements are pure substances that can't be broken down.
what is the least common state of matter in the universe?
liquid
What does the pH scale range from?
0-14
what is one example of an endothermic reaction?
photosynthesis
what has a definite volume and shape?
solids
what is the neutral of the pH scale? Give one example.
the neutral is 7 and water is an example
when does a chemical reaction happen?
it occurs when a substance changes chemically into other substances
what has a definite volume but doesn't have a definite shape?
liquid
why is acidity an important factor for living things?
because most can survive only within a relatively narrow range of acidity.
what is a reactant? what is a product?
the substances being added together which than get re-arranged into the substance called a product.