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aleksklad [387]
3 years ago
5

In an undisturbed stack of rock layers, each containing fossils of once-living organisms, where would some evidence of the most

ancient life forms MOST LIKELY be found? A. at the top of the stack B. near the top of the stack C. in the middle of the stack D. at the bottom of the stack
Chemistry
1 answer:
Gwar [14]3 years ago
4 0

Answer:

A. At the top of the rock stack.

Explanation:

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You have 500,000 atoms of a radioactive substance. After 2 half-lives have past, how many atoms remain?
Aleonysh [2.5K]

Answer:

125000

Explanation:

Because it is halved and halved again.

3 0
2 years ago
Read 2 more answers
3. People and instruments produce different ranges of sound temperatures is this true or false
anzhelika [568]
True I believe since every person has a different temperature and sound waves.
6 0
3 years ago
Given that the concentration of myosin is 25pmol·L−1 and Rmax(Vmax)=208pmol·L−1·s−1 , determine the turnover number of the enzym
DedPeter [7]

Answer:

8.32 s⁻¹

Explanation:

Given that:

The concentration of myosin = 25 pmol/L

R_max = 208 pmol/L/s

The objective is to determine the  turnover number of the enzyme molecule myosin, which has a single active site.

In a single active site of enzyme is known to be a region where there is binding of between substrate molecules, thereafter undergoing chemical reaction.

The turnover number of the enzyme is said to be the number of these substrate molecule which binds together are being converted into products.

The turnover number of the enzyme molecule of myosin can be calculated by the expression: \dfrac{R_{max}}{concentration}

⇒ \dfrac{208 pmol/L/s}{25 pmol/L}

= 8.32 s⁻¹

4 0
4 years ago
What property did mendeleev use to organize his periodic table?
Over [174]
<h2>Answer:</h2>

Mendeleev grouped elements with similar chemical properties (especially valency) together and noted their mass as well. At first he only wrote down 9 elements:

Cl 35.5, K 39, Ca 40

Br 80, Rb 85, Sr 88

I 127, Cs 133, Ba 137

He added more elements to his first period table little by little, putting them into groups by valency and sorting them within their group by mass. He noted that the mass in most cases also increases by group within a period.

On 6 March 1869, he presented his work "The Dependence between the Properties of the Atomic Weights of the Elements" for the first time. It stated that:

The elements, if arranged according to their atomic weight, exhibit an apparent periodicity of properties.

Elements which are similar regarding their chemical properties either have similar atomic weights (e.g., Pt, Ir, Os) or have their atomic weights increasing regularly (e.g., K, Rb, Cs).

The arrangement of the elements in groups of elements in the order of their atomic weights corresponds to their so-called valencies, as well as, to some extent, to their distinctive chemical properties; as is apparent among other series in that of Li, Be, B, C, N, O, and F.

The elements which are the most widely diffused have small atomic weights.

The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a compound body.

5 0
2 years ago
If a quadrilateral has three angels measuring 60, 45 and 100 find the measure of the fourth angel
Nina [5.8K]
The sum of angels of a quadrilateral is equal to 360°.

∠A = 360 - (60 + 45 + 100) = 155
7 0
3 years ago
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