Atoms and Molecules Quiz 1

Law of constant proportion is also referred to as law of definite proportion

• True

• False

The percentage of copper and oxygen in samples of “CuO” obtained by different methods were found to be the same. This illustrates the law of:

• Constant proportions

• Conservation of mass

• Multiple proportions

• Reciprocal proportions

Tags

NGSS.HS-PS1-7

According to Daltons's Atomic theory, "The relative number and kinds of atoms are constant in a given compound." postulate describes

• Law of Conservation of Mass

• Law of Constant Proportion

According to Daltons's Atomic theory, "Atoms are indivisible particles which can neither be destroyed nor created." postulate describes

• Law of Conservation of Mass

• Law of Constant Proportion

Who named indivisible particles as 'parmanu'?

• Maharishi Kannad

• John Dalton

• Proust

• Democritus

Who named indivisible particles as 'atoms'?

• Maharishi Kannad

• John Dalton

• Proust

• Democritus

Who laid the foundation of laws of chemical combination?

• Democritus and Leucippus

• Antoine L. Lavoisier

• John Dalton

In a chemical reaction 150 g Baking soda mixture containing sodium bicarbonate and vinegar on heating gives 87 g of carbon dioxide gas. What mass of solid residue will left in food?

• 63 grams

• 65 grams

• 36 grams

• 87 grams

4 grams of hydrogen reacts with some oxygen to make 36 grams of water. Figure out how much oxygen must have been used by applying the law of conservation of mass?

• 32 grams

• 36 grams

• 4 grams

• 34 grams

_____ are the basic units of matter and the defining structure of elements.

• Atoms

• Compounds

• Elements

• Molecules

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5