Table of Contents
What do you call a substance that can be broken down?
Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule.
What substances Cannot be further broken down?
Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means.
What always stays the same before and after a chemical reaction takes place?
This law states that, despite chemical reactions or physical transformations, mass is conserved — that is, it cannot be created or destroyed — within an isolated system. In other words, in a chemical reaction, the mass of the products will always be equal to the mass of the reactants.
Which substance Cannot be broken down by chemical means *?
elements
The substances that cannot be broken down by chemical means are called elements. A pure substance can be classified as a compound or an element.
What are pure substances that are broken down by chemical changes?
Pure substances that can be broken down by chemical changes are called compounds. This breakdown may produce either elements or other compounds, or both. Mercury (II) oxide, an orange, crystalline solid, can be broken down by heat into the elements mercury and oxygen (Figure 7).
What happens when molecules interact with each other?
When molecules interact with each other, they rearrange to form new substances that have different properties than before. No new substances are formed in physical changes. Physical changes result in changes of state, or phase changes. They do not result in new substances being formed. Melting and freezing are examples of phase changes.
What happens to the particles in a substance when it loses energy?
The table summarises what happens to the particles in a substance when it loses energy, and it freezes or condenses (ie changes state): The particles in a substance stay the same when it changes state – only their closeness, arrangement or motion change. This means that the mass of the substance stays the same.
When does a chemical reaction result in dissolving?
However, dissolving results from a chemical reaction taking place in which one substance breaks down, instead of two substances combining to form a new substance. Chemical reactions can also result in new substances when a substance breaks down after adding lots of energy.