grade 9 quizizz

No matter how much extra oxygen is available, 12 grams of carbon always combines with 32 grams of oxygen. This best illustrates the Proust's law of:

• Multiple proportions

• Definite proportions

• Conservation of Energy

• Conservation of Mass

12 grams of carbon react with 32 grams of oxygen to form exactly 44 grams of carbon dioxide. This is a good example of Lavoisier's:

• Law of Definite Proportions

• Atomic Theory

• Law of Conservation of Mass

• Law of Multiple Proportions

Who started the modern atomic theory (backed with data) of the atom?

• Democritus

• Dalton

• Thomson

• Bohr

Which of the following is NOT a part of Dalton's atomic theory?

• All matter is composed of atoms and empty space

• Atoms are always in motion.

• Atoms of the same element are identical.

• Atoms can't be destroyed...merely re-arranged.

Democritus AND Dalton did NOT believe that

• atoms are indivisible and indestructible

• all matter is made of atoms

• changes in matter are due to the arrangement of atoms

• the nucleus is in the center of an atom

Which law did John Dalton state that two compounds can be made from the same two elements (in different proportions)?

• Law of Definite proportions

• Law of multiple proportions

• Law of conservation of mass

• Dalton's Law

Who proposed the first atomic view of matter?

• Lavoisier
• Empedocles
• Democritus
• Priestley

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

Who named indivisible particles as 'atoms'?

• Maharishi Kannad

• John Dalton

• Proust

• Democritus

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