BMAT BMAT Scientific Knowledge & Applications 2 — Questions and Answers
Question 1: In BMAT Section 2 chemistry, what is the pH of a neutral aqueous solution at 25°C?
- 0
- 7 (Correct answer)
- 14
- 5
Correct answer: 7
At 25°C, a neutral solution has equal concentrations of H⁺ and OH⁻ ions, giving a pH of 7.
Question 2: What type of chemical bond is formed when electrons are shared between two atoms?
- Ionic bond
- Covalent bond (Correct answer)
- Metallic bond
- Hydrogen bond
Correct answer: Covalent bond
Covalent bonds form through the sharing of electron pairs between atoms.
Question 3: In BMAT chemistry, what happens in an exothermic reaction?
- Energy is absorbed from the surroundings
- Energy is released to the surroundings (Correct answer)
- Temperature of the system increases while surroundings cool
- The reaction requires a catalyst to proceed
Correct answer: Energy is released to the surroundings
Exothermic reactions release energy (usually as heat) to the surrounding environment, raising the temperature of surroundings.
Question 4: Which formula correctly calculates the number of moles of a substance?
- Moles = Mass × Molar Mass
- Moles = Mass ÷ Molar Mass (Correct answer)
- Moles = Molar Mass ÷ Mass
- Moles = Volume × Concentration
Correct answer: Moles = Mass ÷ Molar Mass
Moles = Mass (g) ÷ Molar Mass (g/mol), converting grams to moles using the molar mass as a conversion factor.
Question 5: In BMAT chemistry, which statement about isotopes is correct?
- They have different numbers of protons
- They have different numbers of electrons
- They have different numbers of neutrons (Correct answer)
- They are atoms of different elements
Correct answer: They have different numbers of neutrons
Isotopes of an element have the same number of protons but different numbers of neutrons, giving different mass numbers.
Question 6: What is the typical oxidation state of oxygen in most chemical compounds?
- +1
- -1
- -2 (Correct answer)
- +2
Correct answer: -2
Oxygen typically has an oxidation state of -2 in most compounds, except in peroxides (-1) or when bonded to fluorine.
BMAT BMAT Scientific Knowledge & Applications 2
In BMAT Section 2 chemistry, what is the pH of a neutral aqueous solution at 25°C?