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3 years ago

What does photosynthesis mean?

Chemistry

2 answers:

AleksandrR [38]3 years ago

6 0

Photosynthesis is the ability for a plant to turn light into energy, thus feeding it

Gemiola [76]3 years ago

5 0

Photosynthesis is the process by which plants and other organisms convert solar energy to chemical energy. A more complex way is, photosynthesis is the process by which plants algae and some bacteria you sunlight carbon dioxide and water to make food

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Are the bonds in each of the following substances ionic, nonpolar covalent, or polar covalent? (a)KCl (b)P4 (c)BF3 (d)SO2 (e)Br2

larisa [96]

Answer:

(a) Ionic

(b) Nonpolar covalent

(d) Polar covalent

(e) Nonpolar covalent

(f) Polar covalent

For those substances with polar covalent bonds, which has the least polar bond? NO₂

For those substances with polar covalent bonds, which has the most polar bond? BF₃

Explanation:

Are the bonds in each of the following substances ionic, nonpolar covalent, or polar covalent?

The nature of a bond depends on the modulus of the difference of electronegativity (|ΔEN|) between the atoms that form it.

If |ΔEN| = 0, the bond is nonpolar covalent.
If 0 < |ΔEN| ≤ 2, the bond is polar covalent.
If |ΔEN| > 2, the bond is ionic.

(a) KCl |ΔEN| = |EN(K) - EN(Cl)| = |0.8 - 3.0| = 2.2. The bond is ionic.

(b) P₄ |ΔEN| = |EN(P) - EN(P)| = |2.1 - 2.1| = 0.0. The bond is nonpolar covalent.

(c) BF₃ |ΔEN| = |EN(B) - EN(F)| = |2.0 - 4.0| = 2.0. The bond is polar covalent.

(d) SO₂ |ΔEN| = |EN(S) - EN(O)| = |2.5 - 3.5| = 1.0. The bond is polar covalent.

(e) Br₂ |ΔEN| = |EN(Br) - EN(Br)| = |2.8 - 2.8| = 0.0. The bond is nonpolar covalent.

(f) NO₂ |ΔEN| = |EN(N) - EN(O)| = |3.0 - 3.5| = 0.5. The bond is polar covalent.

7 0

4 years ago

Pure chlorobenzene (C6H5Cl) has a normal boiling point of 131.00 °C. A solution of 32.5 g of 2,8-dibromodibenzofuran (C12H6Br2O)

vichka [17]

Answer:

Kb → 1.56 °C / m

Explanation:

This is all about boiling point elevation, the colligative property that shows that boiling point for a solution is higher than boiling point of pure solvent.

This is the formula: ΔT = Kb . m . i

where i is the Van't Hoff factor (ions dissolved in solution). As these are organic compounds, we assume they are non electrolytic,

m is molality (mol of solute / 1kg of solvent)

Kb is our unknown. The value for ebulloscopic constant, it is specific for each solvent.

ΔT = T° boiling from solution - T° boiling from solute

First of all, let's determine the moles of solute.

Mass / Molar mass → 32.5 g/ 113.45 g/mol = 0.286 mol

Molality is mol of solute/ 1 kg of solvent

We must convert the mass from g to kg

195g . 1kg /1000 = 0.195 kg

Molality = 0.286 mol / 0.195 kg = 1.47 m

Let's replace the values in the formula

133.30 °C - 131°C = Kb . 1.47m .1

2.30°C / 1.47 m = Kb → 1.56 °C / m

3 0

3 years ago

Rank the following in order of increasingly positive hydrogen charge: a) HClO2, HCl, CH4, H2O, HClO

Lisa [10]

Answer:

CH4<HClO2<HClO<H2O<HCl

Explanation:

In ranking the compounds on the basis of increasing positive charge of hydrogen, we must consider the relative oxidation numbers of the various elements in the compounds.

Methane contains a nonpolar covalent bond, HClO2 contains a chlorine atom in +3 oxidation state, HClO contains a chlorine atom in +1 oxidation state. The more the positive charge on the halogen atom the lesser the magnitude of positive charge on the hydrogen atom. Between water and HCl, chlorine is more electro negative hence HCl will contain a more positively charged hydrogen atom than water.

8 0

3 years ago

Choose the correct statement(s) for the following reaction: 8Fe(s) + S8 (s) → 8 FeS (s) (a) Iron is being oxidized. (b) Iron is

HACTEHA [7]

Answer:

(a) Iron is being oxidized.

(d) Sulfur is being reduced.

Explanation:

Let's consider the following redox reaction.

8 Fe(s) + S₈(s) → 8 FeS(s)

Iron is being oxidized according to the following oxidation half-reaction:

Fe(s) → Fe²⁺(s) + 2 e⁻

Sulfur is being reduced according to the following reduction half-reaction:

S₈(s) + 16 e⁻ → 8 S²⁻(s)

6 0

4 years ago

Where might you find a temperature of 2 Kelvin?

anyanavicka [17]

D. The coldest regions of outer space

5 0

3 years ago