All categories

3 years ago

Fossil A is found in a rock layer above a layer containing Fossil B. Which fossil is probably older?

Chemistry

1 answer:

ch4aika [34]3 years ago

4 0

Answer:

Fossil B

Explanation:

Fossil B is older because it's later is at the bottom

You might be interested in

The molar absorptivity for aqueous solutions of phenol at 211 nm is 6.17x103L/mol/cm. Calculate the linear range of phenol conce

Scilla [17]

Explanation:

The given data is as follows.

$\lambda$ = 211 nm, $\sum = 6.17 \times 10^{3} mol/L/cm$

l = 1 cm, 7% < Transmittance < 85%

Suppose the aqueous solution follows Lambert-Beer's law. Therefore,

Absorbance = $-log \frac{\text{Percentage transmittance}}{100}$

Hence, for 7% transmittance the value of absorbance will be as follows.

Absorbance = $-log \frac{7}{100}$

$A_{1}$ = 1.155

For 85% transmittance the value of absorbance will be as follows.

Absorbance = $-log \frac{85}{100}$

$A_{2}$ = 0.07058

According to Lambert-Beer's law.

A = $\sum \times l \times C$

where, A = absorbance

$\sum$ = molar extinction coefficient

C = concentration

Therefore, concentration for 7% absorbance is as follows.

$A_{1} = \sum \times l \times C_{1}$

$C_{1}$ = $\frac{1.155}{6.17 \times 10^{3} \times 1}$

= $0.187 \times 10^{-3} mol/L$

= 0.187 mmol/L

Concentration for 85% absorbance is as follows.

$A_{2} = \sum \times l \times C_{2}$

$C_{2}$ = $\frac{0.07058}{6.17 \times 10^{3} \times 1}$

= $0.01144 \times 10^{-3} mol/L$

= 0.01144 mmol/L

Thus, we can conclude that linear range of phenol concentration is 0.01144 mmol/L to 0.187 mmol/L.

6 0

3 years ago

9. A box is pushed 1.5 m to the right in 5 s. What is the box’s average speed to the nearest hundredth of a m/s? *

poizon [28]

Answer:

s = 0.30 m/s

Explanation:

Given data:

Distance travel = 1.5 m

Time taken = 5 s

Average speed of box = ?

Solution:

s = d/t

s = speed

d = distance

t = time

by putting values,

s = 1.5 m/ 5 s

s = 0.30 m/s

7 0

2 years ago

The physical and chemical properties of a molecule depend on its structure. Here are two ball-and-stick models for two compounds

djyliett [7]

Answer:

Ethanol has covalent intramolecular bonds. Ethanol is polar. Ethanol has dispersion intermolecular forces. Dimethyl ether is polar. Dimethyl ether forms hydrogen bonds. Dimethyl ether has dispersion intermolecular forces.

Explanation:

Ethanol is not a carboxylic acid. It is an alcohol and it has covelent intramolecular bonds. It is polar and it also has dispersion intermolecular forces.

Dimethyl ether is also polar and it has forms hydrogen bonds. It also has dispersion intermolecular forces. Dimethyl ether does not have ionic intramolecular forces

7 0

3 years ago

Read 2 more answers

In a titration of 0.35 M HCl and 0.35 M NaOH, how much NaOH should be added to 45.0 ml of HCl to completely neutralize the acid?

Bezzdna [24]

It would be the same amount. So, 45 ml of NaOH is required to be added to the 45 ml of HCI to neutralize the acid fully. Here is a brief calculation:

Firstly, here is your formula: M(HCI) x V(HCI) = M(NaOh) x V(NaOH)
With the values put in: 0.35 x 45 = 0.35 x V(NaOH)
= 45 ml.
There is 45 ml of V(NaOH)

Let me know if you need anything else. :)

- Dotz

6 0

3 years ago

How does a generator transform mechanical energy into electrical energy?

RSB [31]

Answer:

C.) A generator transforms mechanical energy into electrical energy with the help of static electricuty

Example:

they convert mechanical or chemical energy into electrical energy. They do this by capturing the power of motion and turning it into electrical energy by forcing electrons from the external source through an electrical circuit.

(Hope this helps) sorry if it's wrong

5 0

3 years ago