Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
What is physical change?
|
a change in which the properties of a substance change but the identity of the substance always remains the same; a change in the size or state of a substance, usually from temperature, pressure or motion
|
|
|
What is a chemical change?
|
a change in which the identity of a substance changes due to its chemical properties and forms a new substance or substances
|
|
|
What is an element?
|
a substance composed of atoms having an identical number of protons in each nucleus
|
|
|
What is a compound?
|
a substances whose molecules contain atoms from different elements
|
|
|
What is a chemical symbol?
|
a one- or two-letter abbreviation for an element's name (O - oxygen)
|
|
|
What is a chemical formula?
|
a set of symbols that describe the number and kind of elements in a compound (NaCl)
|
|
|
What is matter?
|
anything that takes up space
|
|
|
What is a molecule?
|
a particle of matter made up of two or more atoms joined tightly together
|
|
|
What is a physical property?
|
any characteristic of a substance, such as state, color and volume, that can be observed or measured without changing or attempting to change the material
|
|
|
What is a chemical property?
|
any characteristic, such as the ability to burn, that allows a substance to change into a new substance with different properties
|
|
|
What is oxidation?
|
a common form of chemical reaction which is the combination of oxygen with various elements and compounds
|
|
|
What is tarnish?
|
a thin layer of corrosion that forms over copper, brass, silver, aluminum and other similar metals as their outermost layer undergoes a chemical reaction
|
|
|
What is rust?
|
corrosion that forms on iron and iron-coated materials as it undergoes a chemical reaction
|
|
|
What is exothermic?
|
describes a process which ABSORBS thermal (heat) energy
|
|
|
What is endothermic?
|
describes a process which RELEASES thermal (heat) energy
|
