Sci quiz 9th

Multiple Choice

What is an ion?

• A Charged Atom
• A Large Atom
• A Small Atom
• A Cute Atom

Multiple Choice

Atoms are made up of three basic parts, which are -

• Protons, neutrons, electrons
• neutrinos, protons, neutrons
• quarks, protons, electrons
• electrons, neutrons, and quarks

Multiple Select

Which of the following statements are postulates of Dalton’s Atomic Theory?

• All matter is made of tiny particles called atoms and are indivisible.

• Atoms of all elements can neither be created nor destroyed in chemical reactions.

• Atoms of an element are the same in mass and properties.

• Atoms of different elements possess different masses and different properties.

Multiple Choice

Why was the concept of atoms significant in the development of modern chemistry?

• It explained the indivisibility of matter and allowed scientists to distinguish elements from compounds.

• It helped in the discovery of electricity.

• It led to the invention of new elements.

• It proved that all matter is made of molecules.

Multiple Choice

What is this number called?

• Avocado's Number

• Avogadro's Number

• Mendeleev's Number

• The mole

Multiple Choice

How much is one mole?

• 6.02 x 10²³

• 3 x 10⁸

• 6.67 x 10^-11

• 6.63 x 10^-34

Multiple Choice

What is the molar mass of potassium?

• 19 g/mol

• 22.990 g/mol

• 40.08 g/mol

• 39.098 g/mol

Multiple Choice

What is the molar mass of one molecule of Nitrogen N₂?

• 14.01 amu
• 14.01 g
• 28.02 g
• 28.02 amu

Multiple Choice

Claire and Jake are discussing chemistry. Claire says, "A mole of Ne contains
6.02 x 10²³ _____." What should Jake reply?

• atoms

• grams

• ions

• molecules

Multiple Choice

If you want to know which atom an element is, then count the _____

• protons
• neutrons
• electrons
• nucleons