What are cumulative pollutant examples?

Answers

Answer 1

Answer: a very fatal disese that causes you to poop blood

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Positrons are spontaneously emitted from the nuclei of(1) potassium-37 (3) nitrogen-16
(2) radium-226 (4) thorium-232

Answers

Answer: Option (1) is the correct answer.

Explanation:

A positron is a small particle which contains a +1 charge and its mass is equal to the mass of an electron, that is, $9.109 * 10^(-31)$ kg.

A positron is represent by the symbol $^(0)_(+1)\beta$ .

For example, $^(37)_(19)K \rightarrow ^(37)_(18)Ar + ^(0)_(+1)\beta$

Whereas nitrogen-16 does not decay to give a positron because nitrogen-16 is the daughter isotope formed due to decay of oxygen-16.

The decay reaction is as follows.

$^(16)_(8)O \rightarrow ^(16)_(7)N + ^(0)_(+1)\beta$

And, on radioactive decay of thorium-232 there will be formation of radium-228 along with emission of an alpha particle.

The reaction will be as follows.

$^(232)_(90)Th \rightarrow ^(228)_(88)Ra + ^(4)_(2)\alpha$

Therefore, we can conclude that out of the given options positrons are spontaneously emitted from the nuclei of potassium-37.

Positrons are spontaneously emitted from the nuclei of potassium -37.

According to the kinetic molecular theory, whichstatement describes the particles in a sample of an
ideal gas?
A. The particles are constantly moving in circular
paths.
B. The particles collide, decreasing the total energy
of the system.
C. The particles have attractive forces between them
D. The particles are considered to have negligible
volume.

Answers

Answer:

D. The particles are considered to have negligible volume.

Explanation:

According to the Kinetic Molecular Theory for ideal gases

- Gases are composed of larges molecules which are in constant random motion in a straight line

- The volume of the gas particles is negligible compared to the total volume in which the gas is contained.

- The attractive and repulsive forces between gas molecules is insignificant ie There are no interactive forces.

- The collisions of the particles are perfectly elastic and energy is being transferred between the particles but the total energy remaining constant

Jordan wonders why there is dew on the grass in the morning. He asks a few friends to see what they think. His friend Tasha says that there is dew on the grass because it always rains at night. Did Jordan find a scientific answer?

Answers

No because dew is water droplets that come from condensation rather than from rain coming at night

Jordan did not find a scientific answer if a warm clear day is followed by a cool clear evening Dew will likely form

Which is the equivalent of 750 joules? a. 0.750 kJ b. 7.50kJ c.75.0 kJ d. 750.kL

Answers

1 kJ = 1000 J.
The equivalent of 750 joules is 0.750 kJ.

A(n) ____________ is a substance in which all the exact combinations of elements are always the same.a.synthetic element
b.compound
c.mixtures
d.solution

Answers

A compound is a substance in which all the exact combinations of elements are always the same. The correct option is b.

What is a compound?

Compounds are substances that are made up of two or more substances or elements. A compound is a mixture of two elements, they share bonds with each other, and they form a totally different substance than the above elements.

For example, NaCl is a compound. It is formed by two elements, sodium, and chloride. These elements form a different compound that is common table salt.

Some compounds are pure substances because they are made up of only elements that mix together. They do not contain any impurity or any other substance. They share chemical bonds with each other.

Thus, the correct option is b. compound.

To learn more about compounds, refer to the link:

brainly.com/question/14658388

#SPJ2

b. compound
source is Glencoe Science book grade 7.
Also I just happening to be learning about this at school

Gas hydrates are compact chemical structures made of natural gas andA. halite.
B. water.
C. manganese.
D. petroleum.

Answers

Answer:

Option-B (water) is the correct answer.

Explanation:

Gas hydrates are made up of Solid-Ice water and a natural gas like Methane gas trapped in the lattice of ice water. Gas hydrates are mainly found deep down in the sea where the atmospheric pressure is greater than 1 atm.

Generally Gas hydrates have two main applications.

a) It stabilizes the sea floor other wise its melting will cause land sliding in sea floor.

b) Secondly, it traps a green house gases like Methane, if released these gases could produce Climate changes.

Answer:

B) water

Explanation:

Gas hydrates are essentially crystalline solid cage like structures in which small molecules are trapped in a network of frozen water molecules. The trapped gas molecules are usually methane which is a natural gas.

These methane hydrates are formed when methane and water combine under high pressure conditions usually prevalent in the ocean floors. Gas hydrates are also regarded as a powerful candidates for the production of cleaner energy.

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