Ask question

Ask question

All categories

2 years ago

14

It is the year 2040, and you are a research scientist. The amount of sunlight that reaches the earth has been drastically reduce

d due to a major event like pollution, fires, or volcanoes. Farmers are asking you for help to save their failing crops.

1 answer:

slava [35]2 years ago

3 0

Hhfgbuugucviibygtvhgyvybubbiinubuvycyuj

You might be interested in

4Al(s)+3O2(g)__> 2Al2O3(s)

nasty-shy [4]

What do you want us to work out?

8 0

3 years ago

While exploring a coal mine, scientists found plant fossils in the ceiling of the mine which had been preserved by an earthquake

ale4655 [162]

Answer:

11552.45 years

Explanation:

Given that:

Half life = 5730 years

$t_{1/2}=\frac{\ln2}{k}$

Where, k is rate constant

So,

$k=\frac{\ln2}{t_{1/2}}$

$k=\frac{\ln2}{5730}\ years^{-1}$

The rate constant, k = 0.00012 years⁻¹

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration

Given that:

The rate constant, k = 0.00012 years⁻¹

Initial concentration $[A_0]$ = 160.0 counts/min

Final concentration $[A_t]$ = 40.0 counts/min

Time = ?

Applying in the above equation, we get that:-

$40.0=160.0e^{-0.00012\times t}$

$e^{-0.00012t}=\frac{1}{4}$

$-0.00012t=\ln \left(\frac{1}{4}\right)$

$t=11552.45\ years$

7 0

3 years ago

Name and explain 2 positives of renewable energy

Rus_ich [418]

<u>Solar Energy & Wind Power.</u>

One of the main thing about renewable energy, it will never run out, and it saves you money.

5 0

3 years ago

an_____is a trait that a organism inherits that makes it more suited to it's natural envormemt, helping it survive

Iteru [2.4K]

adaptation may be i guess

4 0

3 years ago

What type of reaction is shown below? Check all that apply. 2Mg+O2—> 2MgO

SSSSS [86.1K]

Answer:

Reaction types are :

Combination(Mg and O combine)
Oxidation (O added to Mg)
Exothermic (light and heat released)

7 0

3 years ago

Read 2 more answers