Science Terms and things to know

A body of coherent matter.

the amount of space measured in cubic centimeters that an object occupies.

the measure of the quantity of some physical property.

the ability of a substance to dissolve.

a chemical reaction in which an atom or ion loses electrons.

a chemical change producing heat and usually light

a substance that can't be broken down into simpler substances by chemical means

a substance consisting of atoms of two or more different elements

composition of two or more substances that aren't chemically combined and can be separated

only contain one type of substance

one of the 4 main states of matter in which the molecules vibrate but do not migrate to other positions.

one of 4 main states of matter in which the molecules can move around freely but are bound loosely by intermelecular forces

one of 4 states of matter in which is composed of molecules in constant random motion

one of the 4 main states of matter similar to gas but consisting of positively charged ions with their detached electrons moving freely about

changing from a liquid state to a solid state by being cooled to a freezing point

changing from a solid to a liquid by reaching the melting point

the change of liquid into vapor at a temperature below the boiling point.

changing a gas or vapor into liquid by either cooling or by being subjected to increased pressure

the process of a solid changing into a gas without going through the liquid phase

any group of 5 nonmetallic elements with similar properties

any of the 6 gases helium,neon,argon,krypton,xenon, and randon

readily partaking in chemical reactions

the emition of radiation by unstoppable atomic neclei undergoin radioactive decay

• any of a series of 15 naturally occuring metallic elements.
• (57-71)

physical property: a characteristic of a substance that does not change

Chemical Property: a property of matter that describes a substances ability to participate in chemical reactions

A pure substance is made of one element that will stay the same no matter how many times it is divided

A mixture is made of multiple substances combined mechannically opposed to chemiacally

• Chemical Change: A change that occurs when one or more substances change into entirely new substances with different properties.
• Ex:Cake batter into cake

• Physical Change a change of matter from one form to another without a change to chemical properties.
• Ex: An ice pop melting

Solids: the atoms are compact and aren't free to move around

Liquids: The atoms are closer together than gas and may move freely but are combined by faint intermelecular forces

Gases: The atoms are spread far apart and can move around in random motions

first layer of the atmosphere

the second layer of the atmosphere

the middle layer of the atmosphere

the second highest layer of the atmosphere

the highest layer of the atmosphere

A front is defined as the transition zone between two air masses of different masses

The movement of air towards the equator.

a belt of light winds along the equator

an instrument for measuring atmospheric pressure

an instrument used to measure rain fall or snow fall

an instrument that measures the temperature

an instrument used to measure the wind speed and often direction

a form of water that condenses from the atmosphere

a measure of hotness or coldness

the contamination of air, water, or soil

the layer of the atmosphere that absorbs harmful ultraviolet rays from reaching earth

caused by burning fossil fuels which warms the earth's surface even further.