Chemistry of Life and Water

Matter is defined as anything that

• is alive

• has energy

• has mass and takes up space

• can dissolve in water

Tags

NGSS.MS-PS1-5

Which subatomic particle has a positive charge?

• Electron

• Neutron

• Proton

• Ion

The atomic number of an element is determined by the number of

• electrons

• neutrons

• protons

• isotopes

Which set correctly represents the main elements of life?

• CHNOPS

• CHOPS

• CHMOPS

• PHONICS

Valence electrons are important because they

• determine atomic mass

• determine how atoms bond

• determine the element’s name

• are found in the nucleus

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NGSS.MS-PS2-3

Atoms bond primarily in order to

• increase mass

• gain protons

• become more stable

• become radioactive

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NGSS.HS-PS1-1

An ionic bond forms when

• electrons are shared equally

• electrons are shared unequally

• electrons are transferred

• hydrogen bonds form

Sodium chloride (NaCl) is best classified as a

• polar covalent compound

• nonpolar molecule

• ionic compound

• hydrogen-bonded compound

Tags

NGSS.HS-PS1-3

Which bond type is weakest individually but critical in biology and powerful in numbers?

• Ionic

• Covalent

• Hydrogen

• Metallic

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NGSS.HS-LS1-6

Water is polar because

• hydrogen is more electronegative

• oxygen shares electrons equally

• oxygen pulls electrons more strongly than hydrogen

• it forms ionic bonds