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sveta [45]
3 years ago
13

What is the primary source of energy for most ecosystems

Chemistry
2 answers:
Aleonysh [2.5K]3 years ago
8 0
Sun is the primary source of energy.
gregori [183]3 years ago
6 0
 The Sun<span> is the major source of energy for organisms and the ecosystems of which they are a part. Producers such as plants, </span>algae<span>, and cyanobacteria use the energy from </span>sunlight<span> to make organic matter from </span>carbon dioxide<span> and water.

</span>
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iron combines with oxygen to form rust. given the chemical reaction, how many grams of rust would be produced if 3 grams of reac
tia_tia [17]

Answer:

I believe its 1 gram

Explanation:

8 0
3 years ago
Do any of the elements have similar properties? ​
Marysya12 [62]

Hello! Charchar here!

Answer:

I don't know what the elements are soo

The elements in the first column of the Periodic Table (other than hydrogen) are known as Group 1A metals, or alkali metals. When you compare the chemical properties of these elements (lithium, sodium, potassium, rubidium, cesium, and francium), what you'll notice is that they are all remarkably similar.

Explanation:

Hope this helped!

Have a nice day!

6 0
3 years ago
Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
CaHeK987 [17]

Answer:

Fe(CN)₂,  FeCO₃,  Pb(CN)₄,  Pb(CO₃)₂

Explanation:

Cations (positively charged ions) can only form ionic bonds with anions (negatively charged ions). However, you can't just simply put one cation and one anion together to form a compound. Each compound needs to been neutral, or have an overall charge of 0. When cations and anions do not have charges that perfectly cancel, you need to modify the amount of each ion in the compound.

1.) Fe(CN)₂
-----> Fe²⁺ and CN⁻

-----> +2 + (-1) + (-1) = 0

2.) FeCO₃

-----> Fe²⁺ and CO₃²⁻

-----> +2 + (-2) = 0

3.)  Pb(CN)₄

-----> Pb⁴⁺ and CN⁻

-----> +4 + (-1) + (-1) + (-1) + (-1) = 0

4.) Pb(CO₃)₂

-----> Pb⁴⁺ and CO₃²⁻

-----> +4 +(-2) + (-2) = 0

5 0
1 year ago
Which element has 21 neutrons and 20 electrons?
mario62 [17]
Scandium has 21 neutrons
6 0
2 years ago
Read 2 more answers
Electron X can change to a higher energy level or a lower energy level. Which statement is true of electron X?
rosijanka [135]

Answer: 2) Electron X absorbs energy when it changes to a higher energy level.

Explanation:

The electrons in an atom exist in various energy levels. When an electron moves from a lower energy level to a higher energy level, energy is absorbed by the atom. When an electron moves from a higher to a lower energy level, energy is released (often as light).

6 0
2 years ago
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