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A pure substance...

• is an element or a compound
• is an element or a mixture
• is a compound or a mixture
• is a mixture

This picture represents which of the following?

• A single element

• Mixture of molecules

• mixture of atoms

• mixture of compounds

Tags

NGSS.MS-PS1-1

The basic building blocks of most of the matter around you.

• elements

• protons

• atoms

• electrons

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What does the total number of protons and neutrons in the nucleus determine?

• The atomic number

• the atomic mass

• the number of electrons

• the number of shells needed for all electrons

What subatomic particle determines the identity of an element?

• number of electrons

• number of protons

• number of neutrons

• number of atoms

Which of the following substances resents an element?

• water

• salt

• trail mix

• gold

What is the smallest unit of an element that still retains the element's properties?

• proton

• neutron

• atom

• molecule

protons are

• located in the nucleus and have a positive charge

• located in the nucleus and have a negative charge

• the most important part of an atom

• atoms

In an element

• there are many different substances

• the atoms are all the same

• the atoms are all different

• the electrons, protons and neutrons are located in the nucleus

Tags

NGSS.MS-PS1-1

Identify the heterogeneous mixture

• sweet tea

• salad

• jello

• gold