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sattari [20]
2 years ago
13

Use what you know about relative dating to choose the correct answers from the drop-down menus. Ethan determines that layer B is

3.5 million years old. Due to the , he can estimate that layer A is years old.
Chemistry
2 answers:
Alex Ar [27]2 years ago
6 0

Answer:

Law of superposition

4 million

Explanation:

Cat 101
2 years ago
Thank you!
AURORKA [14]2 years ago
5 0

Answer: yes

Explanation: no

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A chemist weighed out 19.9 g of aluminum. Calculate the number of moles of aluminum she weighed out.
vodomira [7]
Aluminum is 26.982 grams per mole, so 26.982/19.9 will give you the moles 1.3558794
3 0
3 years ago
Predict whether ΔS° is greater than, less than, or approximately zero for each of the following reactions, and explain your choi
inna [77]

Answer:

Explanation:

Entropy -

In a system, the randomness is measured by the term entropy .

Randomness basically refers as a form of energy that can not be used for any work.

The change in entropy is given by amount heat per change in temperature.

  • When solid is converted to gas entropy increases,

As the molecules in solid state are tightly packed and has more force of attraction between the molecules, but as it is converted to gas, the force of attraction between the molecule decreases and hence entropy increases.

So,

The particles of the substance , if are tightly held by strong force of attraction will decrease the entropy ,

And

If the particles are loosely held , the entropy will increase .  

  • If in a reaction , more number of gaseous atoms are present in the product side , entropy will increase , i.e. Δ°S > 0
  • When liquid is converted to solid entropy decreases,  

As the molecules in liquid state are loosely packed and has less force of attraction between the molecules, but as it is converted to solid, the force of attraction between the molecule increases and hence entropy decreases.

  • If in a reaction , less number of gaseous atoms are present in the product side , entropy will decrease , i.e. Δ°S < 0

From the question ,

( a )  NH₃(g) + 5 O₂(g) → 4 NO(g) + 6 H₂O(g)

Gaseous atoms -

Reactant - 1 + 5 = 6

Product - 4 + 6 = 10 ,

Hence ,

More number of gaseous atoms are present in the product side , So ,

entropy will increase , i.e. Δ°S > 0

( b ) CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

Gaseous atoms -

Reactant - 1 + 2 = 3

Product - 1 + 2 = 3 ,

Since ,

Both the side the value of gaseous atoms are , hence , Δ°S = 0 .

( c ) CaCO₃(s) → CaO(s) + CO₂(g)

Gaseous atoms -

Reactant = 0

Product - 0 + 1 = 1 ,

Since ,

Hence ,

More number of gaseous atoms are present in the product side , So ,

entropy will increase , i.e. Δ°S > 0

8 0
3 years ago
What is the systematic name for TiCl2​
Anarel [89]

Answer:

66228

Molecular Formula: TiCl2 or Cl2Ti

Chemical Names: Titanium chloride (TiCl2) 10049-06-6 TiCl2 Titanium(II) chloride dichlorotitanium More...

Molecular Weight: 118.77 g/mol

Dates: Modify: 2019-08-10 Create: 2005-03-26

Explanation:

66228

Molecular Formula: TiCl2 or Cl2Ti

Chemical Names: Titanium chloride (TiCl2) 10049-06-6 TiCl2 Titanium(II) chloride dichlorotitanium More...

Molecular Weight: 118.77 g/mol

Dates: Modify: 2019-08-10 Create: 2005-03-26

8 0
3 years ago
Normally the capital ÎGo° for a reaction would be determined at standard temperature with each reactant at a concentration of 1
Arte-miy333 [17]

Answer:

d.-379 cal/mol

Explanation:

ΔG = ΔG⁰ + RT ln K

for equilibrium ΔG = 0

ΔG⁰ + RT ln K =0

ΔG⁰   =  -  RT ln K

PG ⇒ PEP

K = [ PEP ] / [ PG ]

= .68 / .32

= 2.125

ΔG⁰   =   - 1.987 x 273 x  ln 2.125

= - 409 Cal / mole

Option d is the nearest answer .

8 0
3 years ago
For the reversible, one-step reaction A+B&lt;----&gt;C+D, the forward rate constant is 52.4 /mol*h and the rate constant for the
Fantom [35]

Answer:

—-—1———————-s

7 0
3 years ago
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