Elements and Compounds
Chemists use what term to describe in a general sense all of the materials or substances around us.
The term "matter"
What year was the most important of all chemical theories advanced?
1805
What's the total number of electrons for oxygen?
6
What pole has a negative charge
Negative pole
What is and ionic bond?
Electrons
What are the four of the major elements?
Carbon, Oxygen, hydrogen, and nitrogen.
What concept did John Dalton propose?
Matter is composed of atoms.
What are the 3 most important types of subatomic particles?
Protons, Neutrons, Electrons.
What kind of bond is water?
Polar molecule
Why do elements differ in chemical and physical properties?
Because of difference in the number of protons in their atomic nuclei.
What does it mean when an element is said to be "pure"?
It cannot be broken down or decomposed into two or more different substances.
What is the nucleus?
The dense central core which particles surround.
How many elements naturally occur on earth?
92
What are lipids polarity?
non-polar
How many elements occur naturally on earth?
92
Chemists assign a symbol to each element, what does the symbol consist of?
The symbol is usually the first letter or two of the English or Latin name of the element.
How many years did people believe that Dalton concieved of atoms as solid indivisible particles.
100 years
What's the largest naturally occurring atom?
Uranium
What molecules result from unequal charge distribution on a molecule?
Polar
How many electrons does hydrogen have?
1
what does the unique "aliveness" of a living organism depend on?
It depends on the complexity, organization, and interrelationships of all elements required for life.
what are the three states of matter?
Liquid, gas, and solid.
In what model are electrons shown in shells or concentric circles.
Bohr's model
What is the other type of bond other then ionic and covalent?
Hydrogen bond
What are atoms called?
Covalent Bond