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3 years ago

Which layer is the oldest layer? How can you tell?

Chemistry

2 answers:

Neporo4naja [7]3 years ago

6 0

Answer:

The principle of superposition states that the oldest rock units are at rock bottom , and therefore the youngest are at the highest . Based on this, layer C is oldest, followed by B and A. So the full sequence of events is as follows: Layer C formed.

Explanation:

aleksley [76]3 years ago

3 0

Answer:

the lowest one

the same way when you are stacking plates the oldest one is at the bottom and the most recently stacked one is at the top

Explanation:

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Average atomic masses listed by IUPAC are based on a study of experimental results. Bromine has two isotopes 73 br and81 br, who

ddd [48]

Answer: The average atomic mass of element bromine is 80.4104 amu.

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

For _{35}^{79}\textrm{Br}[/tex] isotope:

Mass of $_{35}^{79}\textrm{Br}$ isotope = 78.9183 amu

Percentage abundance of $_{35}^{79}\textrm{Br}$ isotope = 50.69 %

Fractional abundance of $_{35}^{79}\textrm{Br}$ isotope = 0.5069

For $_{35}^{81}\textrm{Br}$ isotope:

Mass of $_{35}^{81}\textrm{Br}$ isotope = 80.9163 amu

Percentage abundance of $_{35}^{81}\textrm{Br}$ isotope = 49.31 %

Fractional abundance of $_{35}^{81}\textrm{Br}$ isotope = 0.4931

Putting values in equation 1, we get:

$\text{Average atomic mass of Bromine}=[(78.9183\times 0.5069)+(80.9163\times 0.4931)]$

$\text{Average atomic mass of Bromine}=80.4104amu$

Hence, the average atomic mass of element bromine is 80.4104 amu.

5 0

3 years ago

sa solution is made by dissolving 26.42 g of (NH4)2SO4 in enough H2O to make 50.00 mL of solution. what is the molarity of the s

krok68 [10]

The answer is 0.2 M.

Molarity is a measure of the concentration of solute in a solution

c = n ÷V
c - concentration of solute,
n - number of moles of solute
V - volume of solution

We know:

V = 50.00 mL = 0.05 L

c = ?

n = ?

Let's calculate concentration:

c = m/(V * Mr)

The molar mass of (NH4)2SO4 is the sum of atomic masses (Ar) of its elements):
Mr ((NH4)2SO4) = 2Ar(N) + 8 Ar(H) + Ar(S) + 4Ar(O)
= 2 * 14 + 8 * 1 + 32 + 4 * 16 =
= 28 + 8 + 32 + 64 =
= 132 g/mol

c = 26.42 g/ (0.05 L * 132g /mol) =26.42 g/ 6.6 L*g/mol = 4 mol/L = 4 M

Now, calculate molarity:
c = n ÷V
n = c * V
n = 4 mol/L * 0.05 L
n = 0.2 mol

4 0

4 years ago

Is a compound containing carbons, hydrogens, and hydroxyl groups (oh) that serves as the "backbone" for various lipids?

Alona [7]

Answer is: glycerol.
Glycerol (1,2,3-Propanetriol, glycerine or glycerin) is a simple polyol compound with formula (OH-CH₂-CH(OH)-CH₂OH or C₃H₈O₃). The glycerine backbone is found in all lipids known as triglycerides (ester derived from glycerol and three fatty acids). Glycerol is soluble in water hygroscopic.

8 0

4 years ago

a section in a stained glass window is shaped like a trapezoid. the top base is 4 centimeters and the bottom base is 2.5 centime

Sophie [7]

I do not know honestly.

6 0

3 years ago

What happens to a water bottle in a freezer and why

Andrews [41]

The water well begin to freeze and turn into soild. why? because the temperature of the the freezer is getting the water bottle cold so when that cold temperature hits that that bottle which has liquid in it so you should know that when liquid is into cold air it well so be soild so when you put the water bottle in the freezer it will be soild.
and also remember gas - liquid - soild gas change to liquid by hot air and liuid change to soild by clod air
hoped i helped

5 0

4 years ago

Which layer is the oldest layer? How can you tell? ​

Which layer is the oldest layer? How can you tell?