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Chapter 2

Overall Questions on Chapter 2

What is chemistry? The science that considers the composition of matter and how this composition changes.
What is matter? It is anything that has weight and takes up space such as solids, liquids and gases.
What is matter composed of? Elements
How many elements are known? naturally? 111 and 92
How many elements does the human required? 20
What are 95% of elements in the human? oxygen, carbon, hydrogen, and nitrogen
How do elements vary? In size, weight, and the way they interact with each other.
What does the nucleus of an atom contain? Protons & neutrons. Electrons move around them.
Electrons & neutrons or protons are equal? Protons. This makes it is neutral.
How do you get the Atomic number? The number of protons
How do you get the Atomic Weight? Number of protons and neutrons. Electrons have very light weight.
What 3 particles do atoms have? electrons, protons, neutrons
What is the simplest form of an atom? Hydrogen
1 atom + 1 atom= molecule
Electons & Protons have the same amount. Neutrons..... Vary in amount
What are ions? Atoms that gain or lose elctrons and become electrically charged.
What are catalysts? Particular atoms or molecules that can change the rate of a reaction without being consumed in the process.
What is kinetic energy? When energy is actually doing work (moving objects such as a bouncing ball)
What is potential energy? Inactive or stored energy. (batteries of an unused toy)
What are compounds? Atoms of different elements such as water which contain definite kinds and numbers of atoms.
How many molecules does a grain of salt have? 1.23 x 10 to the 23rd
What is a compound Made of different elements
What is an electrolyte? When some compounds release ions when they dissolve in water
What does PH do? measures hydrogen ion concentration in the blood.
What is Acid? Electrolytes that release hydrogen ion H+ in water.
What is a base? Electrolytes that release ions that combine with hydrogen ions.
What chemicals do Organics have? carbon and hydrogen
What are nonelctrolytes? Organics that dissolve in water but do not produce ions.
What are electrolytes? Chemicals that rest, dissolve in water and release ions.
Name 3 Inorganic substances Water, oxygen, salts or carbon dioxide
What is oxygen used for in the body? release energy from glucose and drives metabolic activities.
What does carbon dioxide do? Waste product that is exhaled from the lungs
Name 3 things salts do Transports substances into or out of cells, muscle contractions, nerve impulses
Where are salts abundant? tissues and fluids
Name 4 organic substances Carbohydrates, lipds, proteins, nucleic acids
Created by: cherub7



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