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Fundamental Chemistry Principles
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Fundamental Chemistry Principles
Fundamental Chemistry Principles
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1
Question
What is defined as the smallest part of an element that can exist?
0:40
Answer
An atom is the smallest part of an element that can exist.
2
Question
How does a compound differ from a mixture in terms of chemical bonding?
0:57
Answer
Compounds contain elements that are chemically bonded in fixed proportions, whereas mixtures are not chemically combined and can be separated by physical processes.
3
Question
What naming rule applies to ionic compounds containing one metallic and one non-metallic element?
1:27
Answer
The name of the metal remains unchanged, while the non-metal's name is modified by taking its first syllable and adding the suffix -ide.
4
Question
How do you identify a compound that contains oxygen using its name?
1:55
Answer
The suffix -ate indicates the presence of oxygen within a compound containing three or more elements.
5
Question
What separation technique is used for an insoluble solid and a liquid?
2:46
Answer
Filtration is used to separate an insoluble solid from a liquid using filter paper.
6
Question
When is crystallization the preferred method over filtration?
3:15
Answer
Crystallization is used to separate a soluble substance from a solvent after the solvent is evaporated.
7
Question
What principle allows distillation to separate a mixture of liquids?
3:37
Answer
Distillation separates liquids based on their different boiling points.
8
Question
What is the function of a fractionating column in fractional distillation?
4:10
Answer
A fractionating column provides a temperature gradient, allowing liquids with different boiling points to condense at different heights.
9
Question
What determines how well a substance is retained in chromatography?
5:02
Answer
Chromatography separates substances according to their retention by the stationary phase and their solubility in the mobile phase.
10
Question
Why must the start line in chromatography be drawn in pencil?
5:48
Answer
The start line must be drawn in pencil because pencil lead is insoluble and will not run or obscure the experimental results.
11
Question
How are subatomic particles arranged in the nuclear model of the atom?
6:09
Answer
Protons and neutrons are located in the nucleus at the center, while electrons orbit the nucleus in shells.
12
Question
How many electrons can fit into the first and second shells of an atom?
6:21
Answer
The first shell can hold a maximum of two electrons, and the second shell can hold a maximum of eight electrons.
13
Question
What does the atomic number tell you about an atom?
6:48
Answer
The atomic number indicates the number of protons within an atom's nucleus.
14
Question
How is the number of neutrons calculated using mass number and atomic number?
7:16
Answer
The number of neutrons is found by subtracting the atomic number (proton count) from the mass number (total particle count in the nucleus).
15
Question
What are the relative mass and charge of a proton?
7:39
Answer
A proton has a relative mass of 1 and a relative charge of plus one.
16
Question
How do you define isotopes of the same element?
8:49
Answer
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.
17
Question
What are the key features of John Dalton's model of the atom?
10:26
Answer
John Dalton envisaged atoms as solid spheres that could not be broken down any further, comparing them to billiard balls.
18
Question
What is the primary characteristic of J.J. Thomson's plum pudding model?
10:40
Answer
The plum pudding model envisaged electrons as negatively charged particles studded into a large ball of positive charge.
19
Question
What evidence did the alpha scattering experiment provide about the atom's structure?
11:20
Answer
The experiment showed that most of the atom is empty space because most alpha particles passed straight through, and the repulsion of some particles proved the existence of a positively charged, dense nucleus.
20
Question
Why did Niels Bohr adjust the model of the atom?
12:04
Answer
Bohr identified that electrons orbit the nucleus at fixed distances, which he called shells, rather than moving randomly.
21
Question
What discovery by James Chadwick explained relative atomic masses?
12:20
Answer
James Chadwick discovered the neutron, which explained why some relative atomic masses were not integer numbers due to the presence of isotopes.
22
Question
How are groups arranged in the periodic table?
13:08
Answer
Groups are the vertical columns in the periodic table, and elements in the same group have the same number of electrons in their outer shell, resulting in similar chemical properties.
23
Question
What determines the arrangement of periods in the periodic table?
13:28
Answer
Periods are the horizontal rows, and elements in the same period have the same number of occupied electron shells.
24
Question
What is the common naming characteristic of the periodic table?
14:29
Answer
The periodic table is named so because the properties of elements recur at regular, periodic intervals.
25
Question
What did Mendeleev do differently when creating the periodic table?
16:14
Answer
Mendeleev left gaps for elements not yet discovered and switched pairs of elements to ensure that chemical properties aligned.
26
Question
What are the physical properties of Group 1 alkali metals?
17:05
Answer
Group 1 metals are soft, highly reactive, and have low melting points.
27
Question
Why does reactivity increase as you go down Group 1?
17:25
Answer
Reactivity increases because the outer electron becomes further from the nucleus, reducing electrostatic attraction and making it easier to lose.
28
Question
What do Group 7 halogens form when they bond covalently?
18:59
Answer
Halogens form diatomic molecules consisting of two atoms covalently bonded together.
29
Question
Why do boiling points increase down Group 7?
20:24
Answer
Boiling points increase because the atoms become larger, leading to stronger intermolecular forces between the molecules that require more energy to overcome.
30
Question
Why are noble gases (Group 0) unreactive?
21:04
Answer
Noble gases are unreactive because their atoms already have a full outer shell, which is a highly stable configuration.