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sineoko [7]
3 years ago
15

Name three radioactive elements

Chemistry
1 answer:
mote1985 [20]3 years ago
3 0
<span>Technetium (TC)- Transition metal.Promethium (Pm)- Rare earth metal.<span>Polonium (Po)- Metalliod.
</span></span><span>

Radioactivity tracers,</span>fission products,<span>controls fission reactions

</span><span>Isotopes are variants of a particular chemical element which differ in neutron number. All isotopes of a given element have the same number of protons in each atom.
</span>

For example<span>, the </span>half-life<span> of a radioactive substance is the amount of time it takes for </span>half<span> of its atoms to decay, and the </span>half-life<span> of a drug is the amount of time it takes before </span>half<span> of the active elements are either eliminated or broken down by the body.</span>

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Which of the following changes would decrease the rate at which a solid solute dissolves in a liquid solvent?
andriy [413]

Answer:

Decreasing surface area of the solid in the liquid.

Explanation:

I don't know how to explain this without using. an example. So, here it is: If you were dipping bread in water, the bread would be completely soaked if you dipped the whole thing, but if you only allowed one part of the bread to be in the water, it would take longer for the water to soak all the way into it. The amount of surface area that is allowed to touch what is making the solid dissolve determines how quickly the whole thing will be dissolved.

3 0
3 years ago
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The reaction shown below occurs in the blood between hemoglobin (Hb) and oxygen.
OlgaM077 [116]

Answer:

A, B, C

Explanation:

Notice that this reaction involves double arrows, meaning this represents an equilibrium reaction in which we observe a forward reaction (combination of hemoglobin and oxygen) and a reverse reaction (decomposition of the oxyhemoglobin complex).

Upon inhalation of oxygen, it accesses the blood of a person and binds to hemoglobin, so the following reaction proceeds to the right.

Similarly, the opposite process takes place in muscles, oxyhemoglobin is decomposed back into hemoglobin and oxygen.

The equilibrium constant reaction is relatively high, since at standard conditions, this is a spontaneous reaction, hemoglobin combines with oxygen without any additional external source of energy.

7 0
3 years ago
Which equation agrees with the ideal gas law?
Pavel [41]

The equation for ideal gas law is written as PV = nRT.

<h3>What is Ideal gas law?</h3>

Ideal gas law states that, the volume of a given amount of gas is directly proportional to the number on moles of gas, directly proportional to the temperature and inversely proportional to the pressure.

PV = nRT

where;

  • P is pressure of the gas
  • V is volume of the gas
  • n is number of moles
  • R is ideal gas constant
  • T is temperature

Thus, the equation for ideal gas law is written as PV = nRT.

Learn more about ideal gas law here: brainly.com/question/12873752

#SPJ1

5 0
2 years ago
What is the difrence beetween thermal energy and temperature
bagirrra123 [75]

Answer:

Hope this helps

Explanation:

Thermal energy, which is more commonly known as heat, is a form of energy. It is measured in joules. Thermal energy is an internal energy for a given system. Thermal energy is the cause for the temperature of a system.

Temperature is the measureable thermal property of a system. It is measured in Kelvin, Celsius, or Fahrenheit. The SI unit for temperature measurement is Kelvin.

Differences:

Thermal energy is not a directly measurable quantity whereas temperature is a measurable quantity.

• The temperature of an object can take negative values depending on the unit system used to measure the temperature, but the thermal energy of a system cannot be negative.

• Temperature is measured in Kelvin whereas thermal energy is measured in Joule.

• An object can lose or gain thermal energy in a state transition without changing the temperature of the system.

6 0
3 years ago
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Why a hot cup if water has more thermal energy than a cold cup of water? ​
Scilla [17]

Answer:

The hotter the substance, the more its molecules vibrate, and therefore the higher thermal energy

:)

8 0
3 years ago
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