Which of the following subatomic particles are involves in chemical bonds?
A. electrons
B. protons
C. neutrons
D. isotrons
Which of the following is NOT a balanced chemical equation?
A. 2 Li + MgCl2 → 2 LiCl + Mg
B. 2 H2 + O2 → 2 H2O
C. NaCl → Na + Cl2
D. Pb(NO3)2 + 2 KI → 2 KNO3 + PbI2
In order to determine which subatomic particles are involved in chemical bonds, we need to understand the nature of chemical bonds. Chemical bonds are formed when atoms interact with each other to achieve a more stable electron configuration. The key player in chemical bonding is the electron.
Therefore, the correct answer to the first question is A. electrons.
Now, let's move on to the second question. To determine if a chemical equation is balanced, we need to ensure that the number of atoms of each element on both sides of the equation is the same.
Examining the given options, let's analyze each one:
A. 2 Li + MgCl2 → 2 LiCl + Mg
This equation is balanced because there are an equal number of lithium (Li) and chlorine (Cl) atoms on both sides of the equation.
B. 2 H2 + O2 → 2 H2O
This equation is also balanced because there are an equal number of hydrogen (H) and oxygen (O) atoms on both sides of the equation.
C. NaCl → Na + Cl2
This equation is not balanced because there is only one chlorine (Cl) atom on the reactant side, but there are two chlorine (Cl) atoms on the product side.
D. Pb(NO3)2 + 2 KI → 2 KNO3 + PbI2
This equation is balanced because there are an equal number of lead (Pb), nitrogen (N), oxygen (O), and iodine (I) atoms on both sides of the equation.
Therefore, the answer to the second question is C. NaCl → Na + Cl2, as it is not a balanced chemical equation.