General chemistry
Atoms, bonds, pH and the mole. A starter deck to adapt to your course and level.
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20/40- 01
In a neutral atom, how do protons and electrons compare?
- 02
What is a covalent bond?
- 03
What is an ionic bond?
- 04
At 25 °C, what does pH below 7 mean for an aqueous solution?
- 05
How do you calculate amount of substance from mass?
- 06
What must be conserved when balancing a chemical equation?
- 07
What does “Atomic number Z” mean?
- 08
What does “Mass number A” mean?
- 09
What does “Isotopes” mean?
- 10
What does “Mole” mean?
- 11
What does “Molar concentration C” mean?
- 12
What does “Dilution” mean?
- 13
What does “Brønsted acid” mean?
- 14
What does “Brønsted base” mean?
- 15
What does “Oxidation” mean?
- 16
What does “Reduction” mean?
- 17
What does “Exothermic reaction” mean?
- 18
What does “Catalyst” mean?
- 19
What does “Valence electrons” mean?
- 20
What does “pH” mean?
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01In a neutral atom, how do protons and electrons compare?
Their numbers are equal.
02What is a covalent bond?
A bond in which atoms share one or more pairs of electrons.
03What is an ionic bond?
Electrostatic attraction between oppositely charged ions.
04At 25 °C, what does pH below 7 mean for an aqueous solution?
The solution is acidic.
05How do you calculate amount of substance from mass?
n = m / M, where m is mass and M is molar mass.
06What must be conserved when balancing a chemical equation?
The number of atoms of each element and the total charge.
07What does “Atomic number Z” mean?
The number of protons in the nucleus.
08What does “Mass number A” mean?
The total number of protons and neutrons in the nucleus.
09What does “Isotopes” mean?
Atoms of the same element with different numbers of neutrons.
10What does “Mole” mean?
An amount containing about 6.022 × 10²³ elementary entities.
11What does “Molar concentration C” mean?
C = n/V: amount of solute divided by solution volume.
12What does “Dilution” mean?
If solute is conserved: C₁V₁ = C₂V₂.
13What does “Brønsted acid” mean?
A species able to donate a proton H⁺.
14What does “Brønsted base” mean?
A species able to accept a proton H⁺.
15What does “Oxidation” mean?
Loss of electrons by a species.
16What does “Reduction” mean?
Gain of electrons by a species.
17What does “Exothermic reaction” mean?
A reaction that releases energy to its surroundings, often as heat.
18What does “Catalyst” mean?
Speeds up a reaction without being consumed overall.
19What does “Valence electrons” mean?
Outer-shell electrons important in chemical bonding.
20What does “pH” mean?
A logarithmic quantity characterizing the acidity of an aqueous solution.