Lecture 2 Flashcards Preview

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Flashcards in Lecture 2 Deck (25)
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1
Q

How many naturally occurring elements are there

A

92

2
Q

Compounds and elements are ________ Substances

A

Pure

3
Q

True or false; Pure substances can be separated into smaller parts by physical means

A

False, cannot

4
Q

True or false; Solutions and mixtures are able to be separated into smaller parts?

A

True

5
Q

True or false; Elements can be separated by chemical reactions

A

False

6
Q

True or false; Atoms are the largest unit of chemical matter

A

False, smaller

7
Q

An allotrope is

A

An element that has more than on stable form ,

ex; oxygen, o2 and o3

8
Q

Protons are located where

A

in the nucleus

9
Q

Electrons are located where

A

they orbit a molecule

10
Q

Neutrons are located where

A

The nucleus

11
Q

Neutrons weigh the sane as _____ but have ___ charge

A

Protons, no charge

12
Q

Isotopes are

A

when an element can have different numbers of neutrons

ex; Hydrogen, 1H, 2H, 3H

13
Q

What makes the atomic weight of an element

A

the number of protons plus neutrons

14
Q

Unpolluted dry air at sea level and standard pressure contains what three major constitutes and what 5 minor gases

A

major: Nitrogen, oxygen, argone
Minor: Carbon dioxide, Ne, Helium, CH4, N2O3

15
Q

Most environmental issues result from change in the __________ gases

A

minor

16
Q

99% of the Earths atmosphere is below _____ and has a mass of ______

A

30km

5 X 10^15 Tonnes

17
Q

What are the layers of the Atmosphere?

A

Troposphere
Stratosphere
Mesosphere

18
Q

The Troposphere is located where

A

0-10 km from the earths surface ( Most life lives here )

19
Q

The straotosphere is located where

A

10-50 km

20
Q

The mesosphere is located where

A

50+ km from the earths surface

21
Q

What are the main environmental issue with the Troposphere?

A

Climate Change

22
Q

What are the main environmental issue with the Stratosphere

A

Hole in the Ozone layer

23
Q

What is a Biogeochemical cycle?

A

The constant movement of gases in and out of the atmosphere

24
Q

What are the sinks and sources of the biogeochemical cycles

A

Sinks: Where a gas goes too
Sources: are where a gas originates

25
Q

Gases move at ____ rates

A

Different