1. What constitutes the nucleus of the atom?
a) Electron
b) Proton
c) Neutron
d) Proton and neutron
Discussion
Explanation: Proton and Neutron are present in the nucleus of the atom. They are together known as nucleons
2. The charge on a proton is _____
a) Positive
b) Negative
c) Neutral
d) Both positive and Negative
Discussion
Explanation: Proton is a positively charged ion. They have a mass of 1 atomic unit. They are present in the nucleus of the atom.
3. The charge on Electron is _______
a) Positive
b) Negative
c) Neutral
d) Both positive and Negative
Discussion
Explanation: Electron is negatively charged. An electron is a subatomic particle with a charge of negative electricity. It is found in all atoms and acting as the primary carrier of electricity in solids.
4. The charge on neutron is ______
a) Positive
b) Negative
c) Neutral
d) Both positive and Negative
Discussion
Explanation: Neutron is neutral, having no charge on itself.
5. The smallest part of an element that cannot exist as a free state is __________
a) Ion
b) Charge
c) Atom
d) Molecule
Discussion
Explanation: Ion is the smallest part of an element. It cannot exist as a free state. Ion can be an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
6. What are positively charged Ions in a solution called?
a) Cation
b) Anion
c) Atom
d) Element
Discussion
Explanation: Cation is a positively charged ion. It will be attracted to a cathode in electrolysis.
7. Atoms of the same element or of different elements combine into larger units which are called ______
a) Atom
b) Molecule
c) Ion
d) Element
Discussion
Explanation: A molecule represents the smallest fundamental unit of a chemical compound that can take part in a chemical reaction. A molecule is a group of atoms bonded together.
8. C3H603 is the chemical formula for _____
a) Ascorbic Acid
b) Lactic Acid
c) Tartaric Acid
d) Lactose
Discussion
Explanation: Lactic acid has the following chemical formula. It can be breakdown using Lactic acid bacteria for fermentation
9. Modern model of the atom shows that electrons are the outside nucleus in a region of high _______
a) Probability
b) Velocity
c) Speed
d) Energy level
Discussion
Explanation: Modern model of the atom shows that electrons are the outside nucleus. They are present in the region of high probability
10. Chemical symbol is the representation of _______
a) Chemical formula
b) Molecular formula
c) Structural formula
d) Atomic Formula
Discussion
Explanation: Chemical Symbol represents a chemical formula. Molecular formula is a chemical formula that gives the total number of atoms of each element in each molecule of a substance.