11/19/15 Bell Work SPI (Atoms) Which of the following best describes an atom? a. protons and electrons grouped together in a random pattern b. protons and electrons grouped together in a alternating pattern c. a core of protons and neutrons surrounded by electrons d. a core of electrons and neutrons surrounded by protons

SPI (Atoms) Which of the following best describes an atom? a. protons and electrons grouped together in a random pattern b. protons and electrons grouped together in a alternating pattern c. a core of protons and neutrons surrounded by electrons d. a core of electrons and neutrons surrounded by protons

Essential Question(s) What is the chemical composition of our atmosphere, and how does this illustrate a mixture of gases? Tennessee SPI Objective: Describe the chemical makeup of the atmosphere. Check for Understanding Explain how the chemical makeup of the atmosphere illustrates a mixture of gases. SPI Atmospheric Composition TOC: # Atmospheric Composition Notes Atmosphere song

SPI Atmospheric Composition  An atmosphere is the mass of gases that surrounds a planet and is held in place by the gravity of the planet.  Planetary atmospheres are common in our solar system (Even the Moon has a thin atmosphere) Jupiter Earth The Moon What is an Atmosphere? Mars Saturn

Earth's Current Atmosphere …(approx) 78% nitrogen …(approx) 21% oxygen …(approx) 1% other gases (argon, water vapor, carbon dioxide, ozone, etc) SPI Atmospheric Composition Earth's Atmosphere Earth’s atmosphere is a mixture of various gases Nitrogen 7 N 14.0 Oxygen 8 O 16.0 Argon 18 Ar 39.9 Remember! Our atmosphere is a MIXTURE & not a compound

Earth's Current Atmosphere …(approx) 78% nitrogen …(approx) 21% oxygen …(approx) 1% other gases (argon, water vapor, carbon dioxide, ozone, etc) SPI Atmospheric Composition Nitrogen 7 N 14.0 Oxygen 8 O 16.0 Argon 18 Ar 39.9

Where did Earth's atmosphere come from?  from comets and planetismals (water from space)  Venting from volcanoes  oxygen from plants (View Holt Online Ch15: Sect 3 VC) SPI Atmospheric Composition

Where did Earth's atmosphere come from?  from comets and planetismals (water from space) SPI Atmospheric Composition What are comets? Comets are giant "dirty snowballs" in space. They consist of frozen water, stellar dust, and rocky debris.p406

Where did Earth's atmosphere come from?  Venting from volcanoes 3 most common gases from volcanoes (1) Water Vapor, (2) Carbon Dioxide, and (3) Sulfur Dioxide SPI Atmospheric Composition

Where did Earth's atmosphere come from?  oxygen from plants (plants absorb carbon dioxide & release oxygen) SPI Atmospheric Composition

Has Earth's atmosphere ever changed? SPI Atmospheric Composition Earth’s first atmosphere was mostly carbon dioxide, water vapor, & ammonia Yes it has! What changed it? Plants converted the carbon dioxide to oxygen, and this oxygen broke down the ammonia into nitrogen.

For the Earth’s atmosphere, section number two in the pie Graph above BEST represents the percentage of…? A) Carbon B) Oxygen C) Argon D) Nitrogen SPI Atmospheric Composition Oxygen

In diagram 01 below, which gas is represented in the portion labeled 1 on the pie chart? A)Argon B) Nitrogen C) Hydrogen D) Oxygen Diagram 01 Diagram 02 SPI Atmospheric Composition Nitrogen

Here is an example of a question you might see on a quiz or test. Atmospheric Composition-Question SPI Atmospheric Composition

Here is an example of a question you might see on a quiz or test. Atmospheric Composition-Question SPI Atmospheric Composition

Exit Ticket A.2 and 4B.1 and 6C.3 and 5D.4 and 6 The table shows the percentage of individuals in a population of insects that is resistant to certain types of insecticides. Which two populations would be most affected by a widespread use of Insecticide 2?