Answer:
Atoms is the smallest unit of a chemical element and consist of three main components protons, neutrons, and electrons.
The number of a neutron is based on the difference between the mass number of the atom (M) and the atomic number (Z). every isotope of an element has a different number of neutron.
But in a neutral atom or average atom, the number of neutrons is equal to the number of protons and the number of electron.
Example of the number of neutrons in an average atom: In Nitrogen-14, the atomic number and the number of protons is 7, it means the number of neutrons will also 7.
Answer:
2.677 J/g°C
Explanation:
Quantity of heat required to raise the temperature of the metal,
Q = mc∆T
where m is the mass of the metal, c is the metal's specific heat capacity, and ∆T is the change in temperature that accompanies the heat transfer process
20.0J = 50.0g × c × 150°C
c = 20.0J/(50.0g × 150°C)
c = 2.677 J/g°C
<span>Endothermic reactions take in heat from the environment in order to react while exothermic reactions release heat during the reaction. For this, D must be true as the products have less energy because they have released heat during the reaction. A and C are incorrect because they products and reactants are equal and B is wrong because the energy of the products would be more as the reaction took in heat.</span>
This magmatic rock consists of volcanic glass (SiO₂,MgO,Fe₃O₄). It is the homogeneous volcanic glass with small water content. Therefore obsidian is very brilliant. In the ancient time made mirrors of it.
