CHEMISTRY MIDDLE SCHOOL

What is biodiversity? I don't really understand...

Answers

Answer 1
Answer:

Answer:

it is also know as biological diversity

Explanation:

it refers to the varieties or various forms of plants and animals species

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HELP PLEASE I need help with these 2 chem questions asap i would gladly appreciate it :)

Answers

10) You need to find the atomic mass of every element, which you can get from any periodic table.

a) 6.02x10^23 atoms of Mg

Atomic mass of Mg = 24.3 g/mol

# of mols = 6.02 x 10^23 atoms / 6.02 x 10^23 atoms/mol = 1 mol

mass = 1 mol x 24.3 g/mol = 24.3 g

b) 3.01x10^23 formula units of Ca Cl2

Atomic masses

Ca: 40 g/mol
Cl: 35.5 g/mol

Formula mass: 40g/mol + 2x 35.5g/mol = 111 g/mol

# of mols = 3.01 x 10^23 / 6.02 x 10^23 = 0.5 mol

mass = 0.5 mol x 111 g/mol = 55.5 g


c) 12.4 x 10^15 molecules of CH2O

formula mass = 12 g/ mol + 2 g/mol + 16 g/mol = 30 g/mol
# of mols

mass = [12.4 x 10^15 / 6.02 x 10^23]mol x 30 g/mol  = 2.1 x 10 ^(-8) g

3)

a) The polar solute is dissolved in water  which is a polar solvent, while the non polar solute is not dissolved in water. This is a  rule in chemistry: polar solvents dissovle polar soultes and non polar solvents dissolve non polar soluted.

The extremes of the polar molecules are easily solvated by the water molecules.

b) KI is an ionic compound, which implies that it will ioinize (separare in iones) in water, being in this way be dissolved, while the CO2, which is no polar, will not be easily dissolved in water under normal conditions

5 examples of a combustion reactions.

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1.) C2H6 + O2 ---> CO2 + H2O  
2.) CH4 + O2 ---> CO2 + H2O
3.) C6H12O6 + O2 ---> CO2 + H2O
4.) C2H5OH + O2 ---> CO2 + H2O

(The numbers are the little tiny 2's or 3's next to the letters!)

Substances which will glow in the dark after being exposed to sunlight are:luminescent
phosphorescent
radioactive
photosensitive

Answers

luminescent I'm pretty sure :)

Which property describes how much energy must be added to an atom to remove an outermost election

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Answer:

By definition, the first ionization energy of an element is the energy needed to remove the outermost, or highest energy, electron from a neutral atom in the gas phase. The process by which the first ionization energy of hydrogen is measured would be represented by the following equation.

Explanation:

Answer:

THE ANSWER IS C OK THANKS FOR THE ASK

Explanation:

If the pH of a solution is 5.3, what is the pOH?
A.5.3
B.4.7
C.8.7
D.9.3

Answers

The correct answer is C) 8.7

What does pH answer mean?

The pH of a solution indicates the acidity or basicity of the answer. A solution is said to be neutral if the pH is 7, if the pH fee is less than 7 then it is acidic in nature and if the pH cost is greater than 7 then the solution is simple in nature.

What does pH stand for?

Ph may appear as it belongs at the periodic desk of factors, however, it's truly a unit of size. The abbreviation pH stands for ability hydrogen, and it tells us how an awful lot hydrogen is in drinks—and the way active the hydrogen ion is.

What's the pH of a solution?

PH is a measure of the attention of H+(aq) ions in an answer. The attention of H+ ions may be stated in mol dm(-three), but the use of the log(10) feature simplifies the numbers concerned. Definition: pH is the terrible logarithm to base 10 of the hydrogen ion awareness in an aqueous solution.

Learn more about the solution  here: brainly.com/question/251701

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Placing of a material in a new place is called _______.

Answers

 it is called deposition

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