Table of Contents
How do chemicals combine?
Chemical compounds are formed by the joining of two or more atoms. A stable compound occurs when the total energy of the combination has lower energy than the separated atoms. The bound state implies a net attractive force between the atoms a chemical bond.
What are substances broken apart or combined in a chemical reaction called?
In a chemical reaction, the atoms and molecules that interact with each other are called reactants. In a chemical reaction, the atoms and molecules produced by the reaction are called products.
What is required for a chemical reaction to occur or break apart?
Molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. Molecules must collide with the proper orientation. A collision that meets these two criteria, and that results in a chemical reaction, is known as a successful collision or an effective collision.
What are examples of mixing and separating?
This technique can be used to separate two liquids when they have different freezing points. For example, a mixture of oil and water can be separated by placing it in the freezer. The water will freeze but the oil will not. The ice can be removed leaving the oil behind.
How can elements be separated?
An element cannot be separated into simpler substances by physical or chemical means. The periodic table organizes elements by their properties. Aggregates (combinations) of elements can form compounds. Its important to know that compounds are pure substances.
How do you break down chemicals?
Compounds can be broken down into smaller compounds, or their basic elements, by chemical change. Sometimes this chemical change requires energy in the form of heat or electricity. For example, heat can be used to break down mercuric oxide into the elements mercury and oxygen.
In which part of a chemical reaction do bonds break in which part do they form?
10 Cards in this Set
| How do bonds break and form during a chemical reaction? | When chemical reactions change into different substances by breaking and forming chemical bonds. |
|---|---|
| What are the two parts of a chemical reaction? | The product and the reactant |
What are chemical reactions in living things?
Chemical reactions that take place inside living things are called biochemical reactions . The sum of all the biochemical reactions in an organism is called metabolism . Metabolism includes both exothermic (energy-releasing) chemical reactions and endothermicno post (energy-absorbing) chemical reactions.
How does chemistry relate to living things?
Living things are made of elements, especially C, H, O, N, P, and S. Living things are alive because of the chemical reactions that occur in their cells, such as cellular respiration and protein synthesis, among many others.