THE GREAT CHALLENGE II 2023

Five quarters of a number is 35. Which is the number?

The equation 0x = 4 has infinite solutions.

• TRUE

• FALSE

An element X loses two electrons to form an cation. Which group is X located on the Periodic Table?

• 16

• 2

• 17

• 1

Chlorine would be most likely to form a covalent bond with...

• potassium

• barium

• fluorine

• zinc

Which of the following is NOT a mixture?

• bronze

• iron

• milk

• wine

The correct name for Fe₂O₃ is....

• iron(II) oxide

• iron(III) oxide

• iron oxide

• oxide of iron

Lavoisier's Law states that...

• mass is neither lost nor gained in chemical reactions

• in a compound, the elements combine in definite proportions to one another by mass

• the sum of the mass percentages of all elements in a compound must be equal to 100

• atoms could neither be created nor destroyed

In the international system of units the current is measured in...

It is not a stage of the technological process...

• need

• verification

• development

• Idea

In a series circuit, all the receptors have the same current

• True

• False