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Degger [83]
3 years ago
15

Calculate the half-life of different radioactive sources.

Chemistry
1 answer:
otez555 [7]3 years ago
7 0
The rate at which a radioactive<span> isotope decays is measured in </span>half-life. The termhalf-life<span> is defined as the time it takes for one-</span>half<span> of the atoms of a </span>radioactive material<span> to disintegrate. </span>Half-lives<span> for </span>various radioisotopes<span> can range from a few microseconds to billions of years.
</span>.
back at it again with that answer
.
zane
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Caffeine (C8H10N4O2) is a stimulant found in coffees and teas. When dissolved in water, it can accept a proton from a water mole
Olenka [21]

Answer:

See figure 1

Explanation:

If we want to find the acid and the Brønsted-Lowry base, we must remember the definition for each of these molecules:

-) Acid: hydrogen donor

-) Base: hydrogen acceptor

In the <u>caffeine structure,</u> we have several atoms of nitrogen. These nitrogen atoms have the ability to <u>accept</u> hydronium ions (H^+). Therefore the caffeine molecule will be the base since it can accept

If caffeine is the base, the water must be the acid. So, the water in this reaction donated a hydronium ion.

<u>Thus, caffeine is the base and water the acid. (See figure 1)</u>

3 0
3 years ago
PLEASE HELP!!
Andrews [41]
The answer should be B. hope this helped ;)
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3 years ago
Scenes A and B depict changes in matter at the atomic scale:
kaheart [24]

Scene B depicts chemical change in matter at atomic change.

Composition distinguishes a chemical reaction from a physical reaction. In a chemical process, the makeup of the components changes; in a physical change, the appearance, smell, or straightforward exhibition of a sample of matter changes without changing its composition. Despite the fact that we refer to them as physical "reactions," nothing is actually changing. A change in the substance in question's elemental composition is necessary for a reaction to occur. Therefore, from now on, we will simply refer to bodily "reactions" as physical changes.

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5 0
2 years ago
Leopard seals are animals adapted to survive in the freezing conditions of Antarctica. Individual leopard seals vary in their di
andreev551 [17]

Answer:

B. Thicker layer of blubber

Explanation:

For the leopard seals to survives this harsh environment, it must have a thicker layer of blubber

Blubber is a thick layer of fat. It is called the adipose tissues and found in most marine organisms.

  • This layer helps in insulating the body against heat loss.
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3 years ago
The revival of jansenism, which centered on miracles that allegedly happened at the grave of a jansenist priest, is evidence of
lapo4ka [179]

The evidence of the revival of Jansenism is the desire of ordinary people to connect themselves to what they saw as the direct work of God.

<h3>What is Jansenism?</h3>

Jansenism is a theological movement that is done with the mixing of Catholicism. It was active in France's kingdom.

Primarily throughout the seventeenth and eighteenth centuries, Jansenism flourished inside Roman Catholicism before being denounced as heresy in 1653 by Pope Innocent X.

Thus, the yearning of common people to participate in what they perceived as God's direct action is proof of the rebirth of Jansenism.

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