# What is Q-value of nuclear reactions?

## What is Q-value of nuclear reactions?

In nuclear physics and chemistry, the Q value for a reaction is the amount of energy absorbed or released during the nuclear reaction. The value relates to the enthalpy of a chemical reaction or the energy of radioactive decay products. It can be determined from the masses of reactants and products.

## What is Q in nuclear fusion?

A fusion energy gain factor, usually expressed with the symbol Q, is the ratio of fusion power produced in a nuclear fusion reactor to the power required to maintain the plasma in steady state. Energy that is not captured within the fuel can be captured externally to produce electricity.

**How do you find the Q-value of a reaction?**

- Write the expression to find the reaction quotient, Q.
- Since Kc is given, the amounts must be expressed as moles per liter (molarity).
- Substitute the values in to the expression and solve for Q.
- Compare the answer to the value for the equilibrium constant and predict the shift.

**Why is Q value negative?**

When heat is absorbed from the solution q for the solution has a negative value. This means that the reaction absorbs heat fron the solution, the reaction is endothermic, and q for the reaction is positive.

### What is a good Q value?

This is the “q-value.” A p-value of 5% means that 5% of all tests will result in false positives. A q-value of 5% means that 5% of significant results will result in false positives. Q-values usually result in much smaller numbers of false positives, although this isn’t always the case..

### Why is Q-value negative?

**What is a good Q-value?**

**Is Q value positive or negative?**

Note: When heat is absorbed by the solution, q for the solution has a positive value. This means that the reaction produces heat for the solution to absorb and q for the reaction is negative. When heat is absorbed from the solution q for the solution has a negative value.

## What does the Q value of a fission reaction mean?

The Q value is a measure of the energy released in a reaction. So in this case it is the energy released in a Pu+gamma reaction (gamma induced fission of Pu). A positive Q value means the reaction is exothermic (which fission very much is), a negative would indicate the reaction was endothermic. May 30, 2015

## What is the Q value of a neutron?

The Q value is the kinetic energy released in the decay at rest. For neutron decay, some mass disappears as neutrons convert to a proton, electron and antineutrino: where mn is the mass of the neutron, mp is the mass of the proton, mν is the mass of the electron antineutrino, and me is the mass of the electron;

**When is the Q value of a reaction negative?**

For reactions in which there is a decrease in the kinetic energy of the products Q is negative. The negative Q reactions are said to be endothermic(or endoergic) and they require a net energy input. See also: Q-value Calculator Q-value of Exothermic Reactions

**What is the Q value of a gamma ray?**

The gamma ray has no charge or mass. Z (Pu) = 94, Z (Sr) = 38. Neutrons have no charge, but atomic mass, A = 1. The Q value is a measure of the energy released in a reaction. So in this case it is the energy released in a Pu+gamma reaction (gamma induced fission of Pu).