Answer:
Explanation: the answer is A
Answer:
Answer is D
Explanation:
an increase in the number of protons
Alpha partical is a He nucleus. When decaying alpha particle mass is reduced by 4 and atomic number is reduced by 2.
The actual element which has 102 protons is No (Nobelium).
Since it has 167 neutrons, the mass = protons + neutrons = 102 + 167 = 269
after an alpha decay, the new element formed has 100 protons which is Fm ( Fermium)
the alpha decaying equation is,
₁₀₂²⁶⁹No → ₁₀₀²⁶⁵Fm + ₂⁴α + heat
the total mass and the atomic number( numbe rof protons) must be equal in both sides.
Answer:
HfCl3
Explanation:
Step 1
Divide the percent by mass of each element by its relative atomic mass
Hf- 62.2/178.5, Cl-37.4/35.5
0.348, 1.054
Step2
Divide through by the lowest ratio
0.348/0.348, 1.054/0.348
1, 3
Therefore the empirical formula is HfCl3
Answer:
Chemical reactions takes place
Explanation:
Chemical energy stored in bonds of chemical compound are released when chemical reactions takes place.
Chemical energy is a form of potential energy that is found in chemical bonds.
- When chemical reactions occur, bonds are broken and formed again.
- The process of breaking and forming new bonds releases chemical energy.
- In this manner most chemical reactions are often accompanied by energy changes
- The energy changes is due to the formation of new bonds.
