Multiple Choice Questions

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Chapter 0 A Very Brief History of Chemistry

Multiple Choice Questions

• Which of the following is the logical progression of elements formed in a star?

• Hydrogen → Helium → Argon → Carbon
• Hydrogen → Helium → Carbon → Argon
• Helium → Hydrogen → Argon → Carbon
• Helium → Hydrogen → Carbon → Argon
• Argon → Carbon → Helium → Hydrogen

Answer: b

Section 0.2

Difficulty Level: medium

• Why is iron the heaviest element formed in a star prior to a super nova?

• The formation of iron in a star starts a cooling process of the star, ending

nucleosynthesis.

• Iron reacts with the hydrogen in stars to cause a violet explosion which leads to a

super nova.

• Iron is the heaviest element that is stable at high temperatures, all others are

radioactive.

• The formation of iron in a star causes a reaction with helium that causes

nucleosynthesis to end.

• When iron is formed in the outer layers of a star is has enough kinetic energy to

leave the gravity of the star and therefore is able to remove itself from the star.

Answer: a

Section 0.2

Difficulty Level: medium

(Chemistry The Molecular Nature of Matter 7e Neil Jespersen Alison Hyslop) (Test Bank all Chapters) 1 / 4

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• One would expect a fairly even distribution of elements on earth; instead we see an uneven

distribution of elements through the earth. Which of the following best describes why we observe this?

• The nebula that formed the earth had elements that were not evenly distributed.
• Winds on the surface of the earth have moved around the heavy and light

elements into bands.

• The early earth liquefied, resulting in heavier elements migrating towards the

core, and lighter elements towards the surface. This migration to the surface was largely by lava flows, which were inconsistent.

• Some elements were soluble in water washed them into pockets on the surface.
• The magnetic properties of the core caused the metals to pool into certain areas

between the poles on earth.

Answer: c

Section 0.2

Difficulty Level: medium

• The relative number of atoms of each element in a particular compound

a. is always l:l.

• is the same as the density ratio.
• is the same as the weight ratio.
• is definite and constant.
• cannot be determined experimentally.

Answer: d

Section 0.4

Difficulty Level: easy

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• Which of the following postulates from Dalton’s atomic theory are now considered

incorrect?

• All the atoms of a given element are identical.

II. Matter consists of very small particles known as atoms.III. Atoms are indestructible and also indivisible.

• III only.
• II only.
• I only.
• I and II
• I and III

Answer: e

Section 0.4

Difficulty Level: medium

• Which of the following statements is/are consistent with Dalton’s atomic theory?

• The atoms in a given sample of an element do not share any common

properties.II. Matter consists of particles called atoms.III. In chemical reactions, atoms merely rearrange, but do not disintegrate.

• III only.
• II only.
• I only.
• II and III
• I and III

Answer: d

Section 0.4

Difficulty Level: medium

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• Which of the following statements is/are NOT consistent with Dalton’s atomic theory?

• The atoms in a given sample of an element do not share any common

properties.II. Matter consists of tiny particles called molecular substances.III. In chemical reactions, atoms merely rearrange, but do not disintegrate.

• III only.
• II only.
• I only.
• II and III
• I and II

Answer: e

Section 0.4

Difficulty Level: medium

• Which of the following postulates from Dalton’s atomic theory is incorrectly stated?

• The atoms in a given sample of an element are identical.
• Matter consists of tiny particles called atoms.
• In chemical reactions, atoms merely rearrange, but do not disintegrate.
• In a given chemical compound, the atoms can be present in various numerical

ratios.

• In a given chemical compound, the atoms are always present in the same fixed

numerical ratio.

Answer: d

Section 0.4

Difficulty Level: medium

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