Increasing the concentration of the acid
Increasing the surface area of CaCO\(_3\)
A and B
Reducing the concentration of the acid
Correct answer is C
The following factors increase a reaction rate
- Increase in concentration of reactants
- Increase in temperature
- Addition of catalyst
- Increase in the surface area of reactant(s)
Enthalpy change
None of the above
Gibb's free energy
Entropy
Correct answer is C
Gibb's free energy is the fraction of the total energy of a system that accounts for how much useful work can be done in a system.
When the end alkyl groups of ethyl ethanoate are interchanged, the compound formed is
propylmethanoate
ethylpropanoate
methyl ethanoate
methyl propanoate
Correct answer is D
No explanation has been provided for this answer.
An element Z contains 80% of \(^{16} _8\)Z and 20% of \(^{18} _8\)Z. Its relative atomic mass is
16.2
17.6
16.0
16.4
Correct answer is D
R.A.M of Z = \(16(\frac{80}{100}) + 18(\frac{20}{100})\)
= \(12.8 + 3.6\)
= 16.4
How many electrons will be found in the nucleus of an atom with mass number 23 and 17 neutrons?
none
6
7
8
Correct answer is A
Electrons are found in the orbit of the atom. They revolve around the nucleus. There's no electron found in the nucleus of an atom.