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2 years ago

Which word help the reader understand the meaning of stratum in paragraoh 3.

Chemistry

1 answer:

snow_tiger [21]2 years ago

4 0

Answer:

It should be D

Explanation:

Stratum is a layer of rock in the ground

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Solid potassium fluoride decomposes into fluorine gas and solid potassium .

inna [77]

2KF(s) -----> 2K(s)+F2(g)

8 0

3 years ago

Born and Meyer developed a quantitative theory of bonding in ionic crystals in which the potential energy of the system is given

blsea [12.9K]

Answer:

E = NA/R^n - N alpha e^2/ (4 piEoR')

Explanation:

Where N = number of positive ion pairs

e= magnitude

R= interatomic distance

n = the Born exponent

6 0

3 years ago

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How many molecules of H₂S are required to form 79.0 g of sulfur according to the following reaction? Assume excess SO2.

Serhud [2]

Answer:

9.89 x 10²³ molecules H₂S

Explanation:

To find the molecules of H₂S, you need to (1) convert grams S to moles S (via the atomic mass of sulfur), then (2) convert moles S to moles H₂S (via the mole-to-mole ratio from equation coefficients), and then (3) convert moles H₂S to molecules H₂S (via Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.

Atomic Mass (S): 32.065 g/mol

2 H₂S(s) + SO₂(g) -----> 3 S(s) + 2 H₂O(l)

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

79.0 g S 1 mole 2 moles H₂S 6.022 x 10²³ molecules
--------------- x --------------- x ---------------------- x ------------------------------------- =
32.065 g 3 moles S 1 mole

= 9.89 x 10²³ molecules H₂S

4 0

1 year ago

Please Help - Complete the table

mario62 [17]

Answer:

Proteins

Elements: C, H, O, N, and some S

Monomer: amino acids

Functions: catalyzing chemical reactions, synthesizing and repairing DNA, structural support, transporting materials across the cell

Examples: hemoglobin, actin and myosin, albumin, keratin

Carbohydrates

Elements: C, H, O

Monomer: monosaccharides

Functions: cellular identity, source of energy, storage of energy, structural support, cell signaling, make ATP, convert solar energy

Examples: glucose, starch, glycogen, peptidoglycan, cellulose, chitin

Nucleic Acids

Elements: C, H, O, N, P

Monomer: nucleotides

Functions: storage and expression of genetic information, transmission of genetic code required for making proteins

Examples: DNA, RNA

Lipids

Elements: C, H, O, and some P and N

Monomer: fatty acids

Functions: energy storage, cell structure, insulation and protection, regulating and signaling, digestion

Examples: steroids (cholesterol), waxes, fats and oils, phospholipids

Hope that helps.

7 0

3 years ago

How many grams of hydroxide pellets, NaOh are required to prepare 50.0ml of a 0.150 M solution ?

horrorfan [7]

The correct answer is E10.

5 0

2 years ago

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