The female part is the pistil. The pistil usually is located in the center of the flower and is made up of three parts: the stigma, style, and ovary. The stigma is the sticky knob at the top of the pistil. It is attached to the long, tubelike structure called the style.

6 0

3 years ago

A pure radioactive substance has a mass of 30 micrograms but had a mass of 240 micrograms 48 years ago. Assuming that the only c

defon

Answer: Half-life of the substance is 16 years.

Explanation:

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

t = age of sample = 48 years

a = initial amount of the reactant = 240 micrograms

a - x = amount left after decay process = 30 microgarms

$48=\frac{2.303}{k}\log\frac{240}{30}$

$k=\frac{2.303}{48}\log\frac{240}{30}$

$k=0.0433years^{-1}$

b) $t_{\frac{1}{2}}$ of reaction

$t_{\frac{1}{2}}=\frac{0.693}{k}=\frac{0.693}{0.0433}=16years$

Thus half-life of the substance is 16 years.

7 0

3 years ago

Hi..evry one how r u allll!!!!!

solmaris [256]

Answer:

I'm doing fine, thank you. How do you do?

7 0

3 years ago

Read 2 more answers

What is clch2ch2ch2oh when oxidized?

Maksim231197 [3]

The first step of the oxidation of a primary alcohol involves conversion to an aldehyde via the elimiination of a hydrogen molecule. Thus, ClCH2CH2CH2OH becomes ClCH2CH2COH, which is 3-chloropropanal.

5 0

4 years ago