Chemistry

The group number tells us how many _________ there are in an element.

• groups
• valence electrons
• energy levels
• chemicals

Tags

NGSS.HS-PS1-1

The ________________ tells you how many energy levels are used in an element.

• group number
• atom
• protons
• period number

How many valence electrons do elements in group 17 have in their outer energy level?

• 7
• 17
• 1
• 0

Tags

NGSS.HS-PS1-1

Which particle does not contribute mass to the atom?

• Proton
• Neutron
• Electron
• Nucleus

Which particle contributes the negative charge to the atom?

• proton
• electron
• neutron
• nucleus

Tags

NGSS.MS-PS1-1

Water is a heterogenous mixture?

• true

• false

Most of the mass in an atom is made up of _____________________?

• protons and electrons
• protons and neutrons
• neutrons and electrons
• electrons and quarks

Tags

NGSS.MS-PS1-1

Dry ice is solid carbon dioxide, or CO2. Dry ice may be used as a cooling agent and contains two oxygen atoms bonded to a carbon atom. Dry ice is a ___________________ .

• pure substance

• mixture

Tags

NGSS.MS-PS1-1

Cake batter is a substance that may contain flour, eggs and sugars mixed by hand or with an electric mixer. Cake batter is a ___________________ .

• pure substance

• mixture

What two types of matter are pure substances?

• elements and solutions

• compounds and mixtures

• elements and compounds

• mixtures and solutions