Review Material for Grade 5 Science UA #2

This liquid is found in citrus fruits and has a pH of 2. It tastes sour and can be used as a preservative.

This slippery substance has a pH of 9 and is often found in cleaning products.

With a pH of 7, this substance is essential for life and neither acidic nor basic.

Found in stomach acid, this substance has a pH of 1 and helps digest food.

Commonly found in baking soda, this substance has a pH of 8 and is used to neutralize acids.

Match each scientist with their discovery:

Dmitri Mendeleev

• Classified elements by atomic mass and predicted undiscovered elements.

• Organized elements by atomic number.

Match each scientist with their discovery:

Henry Moseley

• Developed the modern periodic law based on atomic mass.

• Determined that elements are better organized by atomic number.

Match each scientist with their discovery:

John Newlands

• Proposed the "Law of Octaves," noticing a repeating pattern every eight elements.

• Discovered the noble gases.

Match each scientist with their discovery:

1. Glenn Seaborg

• Discovered the lanthanide and actinide series, rearranging the periodic table to include these groups.

• Developed a classification based solely on atomic size.

Match each scientist with their discovery:
Julius Lothar Meyer

• Developed a table showing the periodic relationship of elements based on atomic volume.

• Arranged elements by electron configuration.