Question 1

Which statement best describes the Ancient Greek idea of matter?

Accepted Answer

Matter is continuous and infinitely divisible.

Question 2

According to the Law of Conservation of Mass, which equation correctly represents a chemical reaction where 10.0 g of mercury oxide decomposes to form 9.24 g of mercury and oxygen gas?

Accepted Answer

$$10.0\ \mathrm{g} = 9.24\ \mathrm{g} + 0.76\ \mathrm{g}$$

Question 3

Which scientist is credited with formulating the Law of Definite Proportions?

Accepted Answer

Joseph Louis Proust

Question 4

A compound is found to contain 12 g of carbon and 32 g of oxygen. According to the Law of Definite Proportions, how many grams of oxygen would combine with 24 g of carbon?

Accepted Answer

$$64\ \mathrm{g}$$

Question 5

Which of the following best explains why the Ancient Greek idea of matter prevailed for nearly 2000 years?

Accepted Answer

It seemed more logical and reasonable at the time.

Question 6

Which tool was NOT essential in the development of the Modern Science Theory of matter in the 1700s?

Accepted Answer

Astrology charts

Question 7

Which statement is a direct consequence of the Law of Conservation of Mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 8

Which of the following is NOT a postulate of Dalton’s Atomic Theory?

Accepted Answer

Atoms can be created or destroyed in chemical reactions.

Question 9

Which experiment would best demonstrate the Law of Conservation of Mass?

Accepted Answer

Heating a sealed container of water and measuring the mass before and after.

Question 10

If a sample of copper carbonate from France contains 50% copper, 40% oxygen, and 10% carbon by mass, what would you expect the composition to be for copper carbonate from Spain?

Accepted Answer

50% copper, 40% oxygen, 10% carbon

Question 11

Which concept did the Ancient Greeks NOT propose about matter?

Accepted Answer

Matter is made of molecules.

Question 12

Which of the following is a real-world application of the Law of Definite Proportions?

Accepted Answer

Water from different sources always contains hydrogen and oxygen in a fixed ratio by mass.

Question 13

Which of the following statements about atoms is supported by modern scientific evidence?

Accepted Answer

Atoms are real and can be observed using advanced technology.

Question 14

Which of the following best describes the difference between the Ancient Greek and Modern Science theories of matter?

Accepted Answer

Ancient Greek theory was based on logical arguments, while Modern Science is based on experimental evidence.

Question 15

If 100.0 g of mercury(II) oxide decomposes to produce 92.4 g of mercury, how much oxygen gas is produced according to the Law of Conservation of Mass?

Accepted Answer

$$7.6\ \mathrm{g}$$

Question 16

Which of the following is NOT a reason why science changes over time?

Accepted Answer

Science is based on unchanging beliefs.

Question 17

Which of the following statements is true regarding the Law of Definite Proportions?

Accepted Answer

A compound always contains the same elements in the same proportion by mass.

Question 18

Which of the following would NOT be considered a chemical change according to the Law of Conservation of Mass?

Accepted Answer

Dissolving sugar in water.

Question 19

Which of the following best illustrates the concept of matter being discrete rather than continuous?

Accepted Answer

Matter is made up of tiny, indivisible particles called atoms.

Question 20

Which of the following is a limitation of Dalton’s Atomic Theory as revealed by later discoveries?

Accepted Answer

Atoms of the same element can have different masses (isotopes).

Early History of the Atom: Foundations of Atomic Theory

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