An english scientist created the first periodic table of elements

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c