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10 Cards in this Set

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What is the difference between an element and a compund?
elemnets are the simplest form of matter that can exist under normal laboratory conditions. elements cannot be seperated into simpler substances by chemical means. they are the building blocks of all other substances. Examples of elements include: Oxygen, hydrogen, and carbon. unlike elements, compound are coposed of two or more combined elements and can be seperated t sipler substances by chemical means.
name a process that can be used to break down a compund into a simpler substance.
heating
What is a chemical reaction?
one or more substances change into a new substance. the starting substances are called reactants and the substances that are formed are called products.
Chemical property
The ability of a substance to undergo a chemical reaction and to form a new substance is called a chemical property.
Words that are often used to signify a chemical change
burn, rot, decompose, ferment, explode, rust, and corrode.
How can you tell if a chemical reaction has taken place?
in general, there are several clues that can serve as a guide. these include: 1, energy is always absorbed or given off in a chemical reaction, a change in color, 3. odor, 4. production of gas, 5. solid from a liquid.
True or false, an energy change in itself is not proof of a chemical change.
True , an energy change in itself is not proof of a chemical change. The change must be irreversible.
what is one of the most familiar examples of chemcal change?
combustion or burning.
Does the quantity of matter change during a chemical change?
No the quantity of matter is unchanged. The mass of products is always equal to the mmass of reactants. p43 conservation of mass
law or conservation of mass
This law states that in any physical change or chemical reaction, mass is neither created or destroyed; it is conserved. In every cas the mass of the products equals te mass of the reactants.
Figure 2.12 an example of this law shows the lightbulb in which the old fashioned bulb burns out. P 43