Elements and Compounds
What is an element?
An element is a pure substance that can not be broken down into simpler parts.
What is a mixture?
A mixture is a combination of two or more substances.
What is a solid?
A solid is matter with a definite shape and takes up definite amount of space.
What is a physical change?
A chemical bond are forces that hold atoms together.
What are chemical properties?
Chemical properties describe the way a substance reacts with another substance.
What is an compound?
A compound is a substance formed by two or more elements.
What is solution?
Solution is when a homogeneous mixture of one substance is dissolved into another.
What is a liquid?
A liquid is matter that takes up a definite shape but the amount of space has no shape.
What do chemical changes do?
Chemical changes produce new substances with chemical properties that are different from the older substance.
What are indicators?
Indicators are tools that can safely determine whether a substance is an acid or a base.
What is an atom?
An atom is the smallest particle of an element.
What is a solute?
A solute is the substance that dissolves.
What is a gas?
A gas is matter with no definite shape and size.
True or False. reactants are present after a chemical change.
False.
What are acids?
Acids are sour tasting substances, acids usually have a pH lower than 7.
What is an molecule?
A molecule is the smallest particle of a compound.
What is a solvent?
A solvent is what the solute dissolves in.
What is the melting point of a solid?
The melting point of a solid is 295 F
What are exothermic reactions?
Exothermic reactions are reactions that give off energy until stopped.
What are bases?
Bases are bitter tasting substances, they usually have a pH higher the 7.
Who originally arranged the periodic table?
Dmitri Mendeleev.
What is an Alloy?
An Alloy is a mixture of one or more metals with other solids.
What is a physical change?
A physical change is altering the size, shape, or shape of a substance without making a new substance.
What are endothermic reactions?
Endothermic reactions are reactions that require a constant supply of energy.
What is neutralization?
Neutralization is when an acid and a base of equal strength are mixed.