At which temperature will the least amount of time pass before someone detects the odor of a fragrant flower?

How are energy and work related?

Luda [366]

Answer:

c

Explanation:

because u need the energy to be able to work

8 0

3 years ago

An igneous rock originally has 3 grams of uranium 238 in it. When dated the rock only contains 1.8 grams. What are the parent an

castortr0y [4]

Answer :

The parent and daughter concentrations (in percentages) is, 60 % and 40 % respectively.

The age of rock is $3.32\times 10^9\text{ years}$

Explanation :

First we have to calculate the parent and daughter concentrations (in percentages).

$\text{Parent concentrations}=\frac{1.8g}{3g}\times 100=60\%$

and,

$\text{Daughter concentrations}=\frac{(3-1.8)g}{3g}\times 100=40\%$

As we know that, the half-life of uranium-238 = $4.5\times 10^9$ years

Now we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{t_{1/2}}$

$k=\frac{0.693}{4.5\times 10^9\text{ years}}$

$k=1.54\times 10^{-10}\text{ years}^{-1}$

Now we have to calculate the time passed.

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $1.54\times 10^{-10}\text{ years}^{-1}$

t = time passed by the sample = ?

a = initial amount of the reactant = 3 g

a - x = amount left after decay process = 1.8 g

Now put all the given values in above equation, we get

$t=\frac{2.303}{1.54\times 10^{-10}}\log\frac{3}{1.8}$

$t=3.32\times 10^9\text{ years}$

Therefore, the age of rock is $3.32\times 10^9\text{ years}$

5 0

3 years ago

Which of the answer choices correctly describes two liquids that cannot combine and form a homogeneous mixture?

tia_tia [17]

The term that is being described above is what we call IMMISCIBLE. This means when liquids are immiscible, it cannot be mixed in order to make a homogeneous mixture. When two liquids are mixed, these will eventually form layers. The answer to this is the first option. Hope this helps.

7 0

3 years ago

Which element, if combined with chlorine, will have the greatest attraction for the chlorine electrons? N P As

Mumz [18]

Basically, the answer for this would be N or NITROGEN. If we combine nitrogen with chlorine, what happens is that, it can attract more chlorine electrons towards itself. The reason is that, nitrogen is considered more electronegative compared to chlorine. So best answer for this is the first option.

5 0

3 years ago

Read 2 more answers

Explain why potassium is more reactive than lithium

viktelen [127]

Potassium metal is indeed more reactive than lithium metal, because potassium has a more loosely bound valence electron. In direct reactions, potassium reacts more violently than lithium.

3 0

3 years ago