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kogti [31]
3 years ago
8

A geologist is attempting to date a layer of sedimentary rock. He performs radioactive dating using uranium-235, which has a hal

f-life of 703 million years. He determines that the uranium-235 has undergone 3 half-lives. Approximately how old is the rock?
710 billion years

2.11 billion years

710 million years

235 million years

2.11 million years

none of the above
Chemistry
2 answers:
Sindrei [870]3 years ago
6 0
It’s 2.11 billion years
Bad White [126]3 years ago
4 0

Answer:

2.11 billion years.

Explanation:

I hope this helps! Have a great rest of your day!

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The density of helium in a 2.00 L tank at 1.0 atm and 23 degrees Celsius is?
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The output density is given as kg/m 3, lb/ft 3, lb/gal(US liq) and sl/ft 3. Specific weight is given as N/m 3 and lb f / ft 3.

5 0
3 years ago
Given the information below, which is more favorable energetically, the oxidation of succinate to fumarate by NAD+ or by FAD? Fu
sasho [114]

Answer:

Oxidation by FAD  

Explanation:

1. Oxidation by NAD⁺

Succinate ⇌ Fumarate + <u>2H⁺ + 2e⁻</u>;                  E°´ =  -0.031 V  

<u>NAD⁺ + </u><u>2H⁺ + 2e⁻</u><u> ⇌ NADH + H⁺;                    </u>  E°´ = <u> -0.320 V</u>

Succinate + NAD⁺ ⇌ Fumarate  + NADH + H⁺; E°' =  -0.351 V

2. Oxidation by FAD

Succinate ⇌ Fumarate + 2H⁺ + 2e⁻;        E°´ = -0.031 V  

<u>FAD + 2H⁺ + 2e⁻ ⇌ FADH₂;                   </u>  E°´  = <u>-0.219 V </u>

Succinate + FADH₂ ⇌ Fumarate + FAD; E°' = -0.250 V

Neither reaction is energetically favourable, but FAD has a more positive half-cell potential.

FAD is the stronger oxidizing agent.

The oxidation by FAD has a more positive cell potential, so it is more favourable energetically.  

 

8 0
3 years ago
Use the reaction below for the decomposition of sodium azide
bezimeni [28]

<u>Answer:</u> The volume of nitrogen gas at STP is 44.8 L.

<u>Explanation:</u>

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation for it follows:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}                    ...(1)

We are given:

Given mass of NaN_3 = 130.0 g

Molar mass of NaN_3 = 65.01 g/mol

Using equation 1:

Moles of NaN_3=\frac{130.0 g}{65.01g/mol}=2mol

For the given chemical equation:

2NaN_3(s) \rightarrow 2Na(s) + 3N_2(g)

By the stoichiometry of the reaction:

2 moles of NaN_3 produces 3 moles of nitrogen gas

At STP:

1 mole of a gas occupies 22.4 L of volume

So, 2 moles of nitrogen gas will occupy =\frac{22.4L}{1mol}\times 2mol=44.8L of volume

Hence, the volume of nitrogen gas at STP is 44.8 L.

8 0
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Sharing electrons between atoms indicates an ionic bond.<br><br> A. True<br> B. False
muminat

The sharing electrons between atoms indicates an ionic bond is FALSE.

I hope this helps

5 0
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