7th molecules & Extended test

What can be thought of as the building blocks of matter?

• Molecules

• Chemical bonds

• Elements

• Atoms

What is a molecule where all the atoms are the same type called?

• A) A compound

• B) A mixture

• C) An element

• D) A solution

What is a molecule where all the atoms are the same type called?

• A) A compound

• B) A mixture

• C) An element

• D) A solution

What is the smallest part of a compound that keeps the properties of that compound?

• A) An atom

• B) A molecule

• C) A mixture

• D) An element

Compounds can be broken down into simpler substances. Which of the following is an example of a compound that can be broken down into hydrogen and oxygen?

• Salt

• Carbon dioxide

• Water

• Methane

What is the fixed ratio of hydrogen to oxygen atoms in a water molecule?

• One hydrogen atom for every one oxygen atom

• Two hydrogen atoms for every two oxygen atoms

• Two hydrogen atoms for every one oxygen atom

• One hydrogen atom for every two oxygen atoms

Why have scientists developed models of atoms and molecules?

• To make them look more interesting

• To help us visualize molecules we can't directly observe

• Because the actual molecules are too large to study

• To prove that molecules do not exist

How do some models represent chemical bonds?

• As dotted lines

• As arrows

• As lines or sticks

• As numbers

What is a chemical bond?

• A physical connection between atoms

• A type of glue that holds atoms together

• An attractive force that holds atoms together

• A magnetic interaction between atoms

What are extended structures?

• Structures that can only be found in liquid form.

• Structures that are different from molecules and can be composed of compounds or elements.

• Simple structures that consist of only one type of atom.

• Structures that are always made up of organic compounds.