Why are \(H_2SO_4\) and \(CaCl_2\), not suitable for drying ammonia gas? They
are poisonous.
pollute the gas
are corrosive
react with the gas
Correct answer is D
\(H_2SO_4\) and \(CaCl_2\) are not suitable for drying ammonia gas because they react with the gas.
Ammonia is a basic gas, and both \(H_2SO_4\) and \(CaCl_2\) are acidic. When these two substances react, they form salts that contain ammonia. This can contaminate the ammonia gas and make it unusable.
In addition, \(H_2SO_4\) is a corrosive substance, and \(CaCl_2\) can be harmful to breathe in. Therefore, it is not safe to use these substances to dry ammonia gas.
\(Zn_{(s)} → Zn^{2+}_{(aq)} + 2e^-\)
\(CuSO_{4(s)} + H_2O_{(l)}\) → \(Cu^{2+}_{(aq)}\) + \(SO_{4(aq)}^{2-}\)
\(Cu^{2+}_{(aq)} + 2e^- → Cu_{(s)}\)
\(Cu^{2+}_{(aq)} + e^- → Cu_{(s)}\)
Correct answer is C
The reduction half equation for the given reaction is:
\(Cu^{2+}_{(aq)} + 2e^- → Cu_{(s)}\)
In the overall reaction, copper(II) ions (\(Cu^{2+})\) gain two electrons (2e^-) and get reduced to form solid copper (Cu) metal. This is the reduction half-reaction in the redox reaction between zinc (Zn) and copper(II) sulfate (\(CuSO_4)\).
The molecule that has a non-polar covalent bond is
HCl
\(NH_3\)
\(Cl_2\)
\(H_2O\)
Correct answer is C
In \(Cl_2\), the two chlorine atoms are identical and have the same electronegativity. Since both atoms have the same electronegativity, the electrons in the covalent bond are shared equally, resulting in a non-polar covalent bond. The molecule does not have a significant separation of charge and lacks a permanent dipole moment
Petrochemistry is an example of
applied chemistry
Biochemistry
Pure chemistry
Environmental chemistry
Correct answer is A
Applied chemistry refers to the practical application of chemical principles and techniques to solve real-world problems and create useful products. Petrochemistry is a branch of applied chemistry that deals specifically with the chemical processes and transformations involved in the extraction, refining, and processing of petroleum and its derivatives
Which of the following elements has its valence electrons in the s-orbital?
Aluminum
Phosphorus
Sodium
Carbon
Correct answer is C
Sodium is an alkali metal, and its atomic number is 11. This means that it has 11 electrons, and its electron configuration is \(1s^2 2s^2 2p^6 3s^1\). The valence electrons are the electrons in the outermost shell, which in this case is the 3s orbital.