Chapter 2 Questions
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Chemical elements
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Fun facts about Calcium
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http://www.facts-about.org.uk/science-element-calcium.htm
Name of Element : Calcium
Symbol of Element : Ca
Atomic Number of Calcium : 20
Atomic Mass: 40.078 amu
Melting Point: 839.0 °C - 1112.15 °K
Boiling Point: 1484.0 °C - 1757.15 °K
Number of Protons/Electrons in Calcium : 20
Number of Neutrons in Calcium : 20
Crystal Structure: Cubic
Density @ 293 K: 1.55 g/cm3
Color of Calcium : silvery
Facts about the Definition of the Element Calcium
The Element Calcium is defined as...
Campbell Reece AP Edition Biology Edition 8 Chpt.2 Test Bank
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The atmosphere
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The atmosphere Made up of a mixture of gases (mainly N2 and O2) Mole fractions of major gases (nitrogen, oxygen, carbon dioxide, argon) are pretty constant with altitude ?interesting stuff? involves tiny amounts of trace gases ? ozone, oxides of nitrogen and sulfur and some others ~ 100% Breathing!!! Argon, Neon, Xenon ? rare gases often used in ?neon? lights Atmospheric gases can be separated by distillation, since they have different boiling points N2 77 K O2 90 K Ar 87 K Ne 24 K CH4 111 K Pressure profile of atmosphere Pressure drops almost exponentially with increasing altitude ... why?? Trop. Strat. Temperature profile in the atmosphere stratosphere pV = nRT ideal gas law is ?pretty good? (why??)
AP Biology Campbell/Reece 8e Chapter 3 Notes
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Chapter 3 – Water and the Fitness of the Environment
3.1 – The polarity of water molecules results in hydrogen bonding
• Polar molecule – two ends of the molecule have opposite charges
• Oxygen: δ-
• Hydrogen: δ+
• Positive hydrogen of one molecule is attracted to negative oxygen of another in a hydrogen bond
3.2 – Four emergent properties of water contribute to Earth’s fitness for life
• Four properties: cohesive behavior, ability to moderate temperature, expansion upon freezing, versatility as a solvent
• Cohesion – the bonding of similar molecules through hydrogen bonds
• Adhesion – the clinging of one substance to another
• Surface tension – a measure of how difficult it is to stretch or break the surface of a liquid
• Kinetic energy – energy of motion
Chemistry review sheet
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Final Review Sheet Radio Active Decays Alpha decay occurs when the nucleus emits an alpha particle. Alpha particles have a positive charge and are equivalent in size to a helium nucleus, and so they are symbolized as . Alpha particles are the largest radioactive particle emitted. This type of radioactivity results in a decrease in the atomic number by 2 and a decrease in the atomic mass by 4. The equation below shows uranium-234 undergoing alpha decay:
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