Answer:
is missing
Explanation:
In a nuclear reaction, the total mass and total atomic number remains the same.
For the given reaction:

To calculate A:
Total mass on reactant side = total mass on product side
4 + 9 = 12 + A
A = 1
To calculate Z:
Total atomic number on reactant side = total atomic number on product side
2 + 4 = 6 + Z
Z = 0

Hence, missing is
.
We are not able to know that the galaxy have oval or sperical shape because we have not such modern technology to look over it
Answer:

Explanation:
Hello!
In this case, since the heat involved during a heating process is computed in terms of mass, specific heat and temperature change as shown below:

Thus, since the heated mass of water was 88 g, the specific heat of water is 4.184 J/g°C and the temperature change is 6.0 °C, we can compute the heat as shown below:

Best regards!
Answer:
heat is released in going from reactants to products
Explanation:
hope this helps