Law of Definite proportion

The law of _____ states that mass is neither created nor destroyed during chemical reactions or physical changes.

• multiple proportions

• definite proportions

• universal gravitation

• conservation of mass

Which ancient Greek philosopher was the first to propose that matter is made up of tiny individual particles called atoms?

• Proust

• Democritus

• Dalton

• Aristotle

What law states that, regardless of the amount, a compound is always composed of the same elements in the same proportion by mass?

• Law of definite proportions

• Law of conservation of mass

• Law of multiple proportions

• Law of mass action

In oxides of nitrogen, atoms combine in small whole number ratios. This evidence supports the law of

• mass action

• conservation of mass

• definite proportions

• multiple proportions

Which of the following illustrates the Law of Conservation of Matter?

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• 
• 

A pure sample of ammonia contains 14 g of nitrogen and 3 grams of hydrogen. A second sample of pure ammonia contains 28 g nitrogen and 6 g of hydrogen. This is an example of the

• law of universal gravitation

• law of multiple proportions

• law of definite proportions

• law of mass action