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3 years ago

Help please please help please

Chemistry

2 answers:

Pavlova-9 [17]3 years ago

6 0

I can answer the second one, write a story abt a bunny and the grass or an animal that has the same needs as a bunny.
The bunny is the heterotroph and the grass is the autotroph!
hope this helps a little!

Anni [7]3 years ago

5 0

Answer:

I don't fully understand what this is about...

Explanation:

sorry :(

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4 Al + 3 O2 --> 2 Al2O3

SIZIF [17.4K]

Answer:

The answer to your question is 7.4 moles of Aluminum

Explanation:

Data

moles of Al = ?

moles of Al₂O₃ = 3.7

Balanced chemical reaction

4 Al + 3 O₂ ⇒ 2 Al₂O₃

To solve this problem use proportions and cross multiplication. Use the coefficients of the balanced chemical equation.

4 moles of Aluminum ----------------- 2 moles of Al₂O₃

x ----------------- 3.7 moles of Al₂O₃

x = (3.7 x 4) / 2

x = 14.8 / 2

x = 7.4 moles of Aluminum

5 0

3 years ago

If 50.0 g of water saturated with potassium chloride at 80.0°C is slowly evaporator to dryness, how many grams of the dry salt w

balu736 [363]

Answer:

25.0 g.

Explanation:

From the solubility curve that is shown in the attached image, the solubility of KCl per 100.0 g of water is about 50.0 g.

<em>So, a saturated solution of KCl in 50.0 g of water will contain about 25.0 g.</em>

<em>Thus, the grams of the dry salt that will be recovered is 25.0 g.</em>

5 0

3 years ago

Which of the following is a correct lewis structure for sulfur dioxide, so2?

pshichka [43]

The correct Lewis structure of SO2 is the Lewis structure that shows all the 12 valence electrons in the molecule.

A Lewis structure shows the number of valence electrons on the valence shell of all the atoms in a compound. The electrons are shown as dots around the symbol of each element or a dash to indicate shared electrons in a covalent bond.

Looking at the Lewis structure of SO2 attached to this answer, we can see the twelve valence electrons in the molecule and how they are distributed around each atom as shown.

Learn more: brainly.com/question/20514601

3 0

2 years ago

What is the objective of sustainable development? Sustainable development is concerned with meeting needs without jeopardizing t

Anna [14]

Answer:

To meet the needs of the present without jeopardizing that of the future.

Explanation:

Sustainable development applies to all faculties of resource allocation. Most available resources are limited in their capacity to satisfy our limited human wants.

Sustainable development is such development geared towards satisfying the developmental needs of our present generation without endangering those of the future generations.
It allows for safe and efficient use/allocation of resources to meet wants.
Conservation of resources is an approach towards sustainable development.
The use of recycled materials is one method of attaining the obligations of sustainable development.

5 0

3 years ago

Answering the easy questions first is

Setler79 [48]

Answer:

ddfdsfd

Explanation:

sdgh hjrtj

8 0

2 years ago