Set 7 7th grade Science

What is an element?

• a movie

• a pure substance

• a mixed substance

• a toxic substance

What is a chemical symbol?

• letters of the alphabet in a sentence

• chemicals that save people

• letters for elements

• numbers for elements

atom

• largest part of an element

• part of a nuetron

• part of an electron

• smallest part of an element

What is a chemical formula?

• written form of compounds

• written form of numbers

• written form of letters

• written form of atoms

Which one shows two subscripts?

•  $H_2O$  

•  $H_1N_1$  

• C-H-O

• 62

What is a proton?

• inside the nucleus-positive charge

• inside the nucleus-negative charge

• inside the nucleus-negative and positive charge

• inside the nucleus-nuetral charge

What is a neutron?

• inside the nucleus-negative charge

• inside the nucleus-triple charge

• inside the nucleus-no charge

• inside the nucleus-double charge

What is an electron?

• inside the nucleus-crazy charge

• inside the nucleus- positive charge

• inside the nucleus-no charge

• inside the nucleus-negative charge

This is the smallest part of compounds. What is it?

This has 2 or more different elements. What are they?