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Lerok [7]
3 years ago
10

What are the propertirs of Radon?

Biology
1 answer:
Trava [24]3 years ago
6 0

Radon is colorless at standard temperature and pressure and it is the most dense gas known. At temperature below it's freezing point is has a brilliant yellow phosphorescence. It is chemically nonreactive, it is highly radioactive and has a short half life.

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How does a nervous impulse begin
Yakvenalex [24]
It begins with a change in the charge of voltages found in something called axon walls. 
8 0
3 years ago
Read 2 more answers
Emily is given an object by her grandmother. She is told it is worth a lot of money. Emily thinks it is quite ugly on the outsid
Darya [45]

Answer:

Rock

Explanation:

Minerals are inorganic substances that occur naturally in nature and have a  

a definite chemical composition and a crystalline structure while rocks may consists of one or many minerals together along with some organic remains due to which it may not look shiny and crystalline from outside.  

Here, the two characteristics that enable the reader to identify the object given by grandmother to Emily as rock  are –  

a) Looks ugly on the outside (shows the presence of organic matter)

b) solid purple color with pretty crystals (crystalline structure inside)

8 0
3 years ago
An organic compound consists of which of the following elements? A. carbon B. helium C. potassium D. all of the above
earnstyle [38]
An organic compound consists of carbon...
3 0
3 years ago
A woman in the third trimester of her first pregnancy expresses fear about the birth canal being wide enough for her to push the
NeX [460]
Relaxin

<span>Relaxin, secreted by the corpus luteum of the ovary as well as the placenta, is responsible for helping to inhibit uterine activity and to soften the cervix and the collagen in joints. Softening of the cervix allows for dilatation at birth; softening of collagen allows for laxness in the lower spine and so helps enlarge the birth canal. The effect of estrogen is to cause breast and uterine enlargement. Progesterone has a major role in maintaining the endometrium, inhibiting uterine contractility, and aiding in the development of the breasts for lactation. Human placental lactogen (hPL), also known as human chorionic somatomammotropin, serves as an antagonist to insulin, making insulin less effective, thereby allowing more glucose to become available for fetal growth.</span>
4 0
3 years ago
suppose you found a bone of a mastodon which had 6.25%c14and93.75%n14 how long ago did this animal die​
lisabon 2012 [21]

Answer:

t= 3886.18 years old

Explanation:

Whenever an animal dies de C14 and N14 begin to disintegrate in such a way that the proportion between C14 and C12 decreases, with a semi-disintegration period of 5.730 years, T. To get to know how long it takes an element to disintegrate, we must use this semi-disintegration period, which is the time it takes until the amount of the element is reduced to its half.  

We can find the age of the fossil, t, by using the next formula:

t = - (T x ln (C14))/ ln (2)

t = - (5730 x ln (0.625)/0.693

t= - (-2693.12)/0.693

t= 3886.18  

3 0
3 years ago
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