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3 years ago

Base your answers to questions 74 through 76 on the data table below and on your knowledge of Earth

Chemistry

1 answer:

Serjik [45]3 years ago

6 0

Answer:

See explanation

Explanation:

Now we have, the graph attached.the stable disintegration product of C-14 is N-14.

Then;

Since the mass of C-14 originally present is 64g, at a time t= 17100 years, we will have;

N/No = (1/2)^t/t1/2

N = mass of C-14 at time t

No= mass C-14 originally present

t = time taken for N amount of C-14 to remain

No = mass of C-14 originally present

t1/2 = half life of C-14

N/64 = (1/2)^17,100/5730

N/64 = (1/2)^3

N/64 = 1/8

8N = 64

N = 8 g

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The reaction below has an equilibrium constant kp=2.2×106 at 298 k. 2cof2(g)⇌co2(g)+cf4(g) you may want to reference (pages 680

OLEGan [10]

<span>Kp is the equilibrium pressure constant calculated from the partial pressures of a reaction equation.
Kp =[pCF4]*[p CO2] / [p COF2]^2 = 2.2 x 10^6
When the mole fraction gets doubled we have
Kp = [pCO2]^2*[pCF4]^2 / [pCOF2]^4
Kp = [[pCF4]*[p CO2] / [p COF2]^2] * 2
Kp = (2.2 * 10^6) * 2
Kp = 4.8 * 10^12</span>

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3 years ago

18. Sucralose contains which two functional groups: (2 points)

sasho [114]

Answer:

The correct answer is option B and D, that is, halogen (chlorine) and hydroxyl.

Explanation:

An artificial sweetener and sugar substitute is sucralose. It is noncaloric as the majority of the sucralose ingested does not get dissociated within the body. The generation of sucralose takes place by the chlorination of sucrose. It is about 300 to 1000 times sweeter in comparison to sucrose.

The consumption of sucralose is safe for both nondiabetics and diabetics, it is used in various food and beverage components due to non-caloric sweetener characteristics. It does not affect the levels of insulin and does not affect dental health. As it is produced by chlorination of sucrose, thus, the functional groups present in it are a halogen (chlorine) and a hydroxyl.

6 0

3 years ago

In a cycle of copper experiment, a student first reacts a piece of copper metal with nitric acid to produce copper(II) nitrate (

LuckyWell [14K]

Answer:

0.631 grams is the theoretical yield of solid copper (Cu) that can be recovered at the end of the experiment

Explanation:

The concentration of the solution is given by :

$[C]=\frac{\text{Moles of compound}}{\text{Volume of solution in Liters}}$

We have:

Concentration of copper (II) nitrate solution = $[Cu(NO_3)_2]=2.41 M$

The volume of solution = 4.12 mL

1 mL= 0.001 L

$4.12 mL= 4.12\times 0.001 L= 0.00412 L$

Moles of copper (II) nitrate in solution = n

$2.41=\frac{n}{0.00412 L}=0.0099292 mol$

Moles of copper (II) nitrate in solution = 0.0099292 mol

1 Mole of copper(II) nitrate has 1 mole of copper then 0.0099292 moles of copper(II) nitrate will have :

$1\times 0.0099292 mol= 0.0099292 \text{ mol of Cu}$

Mass of 0.0099292 moles of copper:

$=0.0099292 mol\times 63.55 g/mol=0.63100 g\approx 0.631 g$

This mass of copper present in the solution is the theoretical mass of copper present in the given copper(II) nitrate solution.

0.631 grams is the theoretical yield of solid copper (Cu) that can be recovered at the end of the experiment

7 0

3 years ago

At a high elevation, there is little chance of... a) flooding b)lack of oxygen c) getting dizzy

labwork [276]

Answer:

A. flooding

Explanation:

At high elevations air becomes thinner so a person may not be receiving enough oxygen which can cause dizziness. Flooding typically happens at sea level.

7 0

3 years ago

What is the formula for finding volume of an object if you know its density and mass?

eimsori [14]

Density equals mass times volume

4 0

3 years ago