Car bombs explode near senior Shiite politician's compound, killing at least 14

What is the basic definition of an element?

• A substance that changes its form easily

• A mixture of different compounds

• A substance that can be broken down into simpler substances

• A pure substance consisting of only one type of atom

Which of the following is a property of elements?

• They can be easily separated into simpler substances

• They consist of multiple types of atoms

• They have a unique set of properties

• They are always in a gaseous state

How do elements differ from compounds?

• Elements are made of one type of atom, while compounds are made of two or more types

• Elements can be broken down into simpler substances, compounds cannot

• Elements are always solid, compounds are always liquid

• Elements are synthetic, compounds are natural

In which field are elements particularly significant?

• Astrology

• Culinary arts

• Chemistry

• Literature

Why are elements important in scientific research?

• They form the basis of all matter and chemical reactions

• They are irrelevant to scientific studies

• They are used to predict weather patterns

• They are used to create fictional stories