Who proposed the concept of 'atomos' as small, indivisible particles?

• Aristotle

• John Dalton

• Democritus

• Isaac Newton

What did Aristotle believe were the fundamental elements of matter?

• Atoms

• Earth, Air, Fire, Water

• Solid, Liquid, Gas

• Protons, Neutrons, Electrons

Which scientist's views on matter were more popular for nearly two millennia?

• John Dalton

• Aristotle

• Democritus

• Isaac Newton

What was John Dalton's profession before he became a scientist?

• Philosopher

• Teacher

• Writer

• Physician

Which of the following is NOT one of Dalton's five postulates?

• All matter is composed of extremely small particles called atoms.

• Atoms of a given element are identical in size, mass, and other properties.

• Atoms can be subdivided, created, or destroyed.

• Atoms of different elements can combine in simple whole number ratios to form chemical compounds.

Tags

NGSS.HS-PS1-7

According to Dalton, what happens to atoms during chemical reactions?

• They are destroyed.

• They are created.

• They are combined, separated, or rearranged.

• They change into different elements.

Tags

NGSS.HS-PS1-7

Which law states that the total mass of products must equal the total mass of reactants in a chemical reaction?

• Law of Constant Composition

• Law of Definite Proportions

• Law of Multiple Proportions

• Law of Conservation of Mass

Tags

NGSS.HS-PS1-7

What does the Law of Multiple Proportions state?

• Mass is conserved in chemical reactions.

• Atoms of different elements can combine in simple whole number ratios to form chemical compounds.

• A given chemical compound always contains the same elements in the same proportions by mass.

• The different masses of one element that combine with the same mass of another element are in the ratio of small whole numbers.

Which law supports Dalton's fourth postulate about atoms combining in simple whole number ratios?

• Law of Multiple Proportions

• Law of Definite Proportions

• Law of Constant Composition

• Law of Conservation of Mass

What does the Law of Definite Proportions state?

• Atoms of different elements can combine in simple whole number ratios to form chemical compounds.

• The different masses of one element that combine with the same mass of another element are in the ratio of small whole numbers.

• A given chemical compound always contains the exact same elements in the exact same proportions by mass.

• Mass is conserved in chemical reactions.