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Alika [10]
3 years ago
12

Ponds and rivers are two types of

Chemistry
2 answers:
Alex17521 [72]3 years ago
8 0
Freshwater ecosystems, because marine includes things more like the ocean depths, rain forests are FORESTS, and rivers and ponds have fresh water.
NeX [460]3 years ago
5 0
<u><em>Ponds and rivers are two types of  . . . . freshwater ecosystems</em></u>
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How many molecules are in 69 grams of Na?
12345 [234]
Molar mass Na = 23.0 g/mol

1 mol ---- 23.0 g
n mol ---- 69 g

n = 69 / 23.0

n = 3.0 moles

1 mole -------- 6.02x10²³ molecules
3.0 moles ---- ?

3.0 *  6.02x10²³ / 1

= 1.806x10²⁴ molecules

hope this helps!




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2 years ago
What is a liquid mixture whose parts are evenly blended?.
Eva8 [605]

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A homogeneous mixture is a type of mixture in which the individual substances are evenly mixed.

Explanation:

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How does H2O represent compounds
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Compound consist of molecules that are identical, this molecules are made up of atoms of two or more elements. An element is identified based on the atomic property of the element. Water as a compound is composed of 2 Hydrogen atom to 1 oxygen atom and the molecule is H2O.

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Ions that are present before and after a neutralization reaction are
VikaD [51]

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spectator ions

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3 years ago
Boiling occurs when molecules being changed from liquid to gas plz tell me the answer true or false
Valentin [98]

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Liquid to Gas

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The particles need energy to rise and over come the attractions between them as the liquid gets warmer more particles have sufficient, energy to escape from liquid. eventually even particles in the middle of the liquid form bubbles of gas in the liquid At this point the liquid is boiliing and turning into gas.

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