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3 years ago

7th grade science , help me please :))

Chemistry

1 answer:

konstantin123 [22]3 years ago

7 0

1. Organisms in just large molecules like carbohydrates proteins and fats and convert them into small molecules like carbon dioxide and water.
2. During cellular respiration of glucose molecule is gradually broken down into carbon dioxide and water. Then some ATP is produced directly in the reactance that transformers glucose.
3. Photosynthesis converts carbon dioxide and water into oxygen and glucose. While, cellular respiration converts oxygen and glucose into water and carbon dioxide.

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Describe and name the parts of the atom.

Setler79 [48]

Answer:

The parts of an atom are<em><u> protons, electrons, and neutrons.</u></em>

A proton is positively charged and is located in the center or nucleus of the atom.

Electrons are negatively charged and are located in rings or orbits spinning around the nucleus.

The number of protons and electrons is always equal.

4 0

3 years ago

Read 2 more answers

For the following hypothetical reaction: 3A + 3B —> 2C. How many moles of B will you need to convert 4 moles of A into as man

galben [10]

Answer:

Do you still need this??

Explanation:

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3 years ago

4. Magnesium and oxygen undergo a chemical reaction to

erastovalidia [21]

Answer:

About 16.1 grams of oxygen gas.

Explanation:

The reaction between magnesium and oxygen can be described by the equation:
$\displaystyle 2\text{Mg} + \text{O$_2$} \longrightarrow 2\text{MgO}$

24.4 grams of Mg reacted with O₂ to produce 40.5 grams of MgO. We want to determine the mass of O₂ in the chemical change.

Compute using stoichiometry. From the equation, we know that two moles of MgO is produced from every one mole of O₂. Therefore, we can:

Convert grams of MgO to moles of MgO.
Moles of MgO to moles of O₂
And moles of O₂ to grams of O₂.

The molecular weights of MgO and O₂ are 40.31 g/mol and 32.00 g/mol, respectively.

Dimensional analysis:

$\displaystyle 40.5\text{ g MgO} \cdot \frac{1\text{ mol MgO}}{40.31\text{ g MgO}} \cdot \frac{1\text{ mol O$_2$}}{2\text{ mol MgO}} \cdot \frac{32.00\text{ g O$_2$}}{1\text{ mol O$_2$}} = 16.1\text{ g O$_2$}$

In conclusion, about 16.1 grams of oxygen gas was reacted.

You will obtain the same result if you compute with the 24.4 grams of Mg instead:

$\displaystyle 24.4\text{ g Mg}\cdot \frac{1\text{ mol Mg}}{24.31\text{ g Mg}} \cdot \frac{1\text{ mol O$_2$}}{1\text{ mol Mg}} \cdot \frac{32.00\text{ g O$_2$}}{1\text{ mol O$_2$}} = 16.1\text{ g O$_2$}$

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2 years ago

A solution in which more solute can be dissolved is called a(n) ???? solution

Svet_ta [14]

Answer:it's called unsaturated solution, because that's it's definition

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3 years ago

When the equation for the complete combustion of one mole of c3h7oh is balanced, the coefficient for oxygen is?

son4ous [18]

C₃H₇OH + 4,5O₂ ----> 3CO₂ + 4H₂O

The coefficient for oxygen is 4,5.

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3 years ago