Christine Davis - IU8
Test por , creado hace más de 1 año

(Essential Chemistry of Life) Biology Test sobre Water as an Essential Molecule of Life, creado por Christine Davis - IU8 el 31/07/2017.

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Christine Davis - IU8
Creado por Christine Davis - IU8 hace casi 7 años
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Water as an Essential Molecule of Life

Water as an Essential Molecule of Life

Pregunta 1 de 6

2

Which of the following makes up a molecule of water?

Selecciona una de las siguientes respuestas posibles:

  • One atom of hydrogen and one atom of oxygen

  • One atom of hydrogen and one atom of sodium

  • Two atoms of hydrogen and two atoms of oxygen

  • Two atoms of hydrogen and one atom of oxygen

Explicación

Pregunta 2 de 6

2

Most of water's properties occur because it is:

Selecciona una de las siguientes respuestas posibles:

  • A polar covalent bonded molecule

  • Made with oxygen

  • A polar ionic

  • Makes up 75% of the earth

Explicación

Pregunta 3 de 6

2

Hydrogen bonds take place between the …

Selecciona una de las siguientes respuestas posibles:

  • hydrogens of the water molecules

  • oxygen and oxygen of the water molecules

  • oxygen on one water molecule and the hydrogen of the other water molecule

  • oxygen and hydrogen of the same molecule

Explicación

Pregunta 4 de 6

2

Which property of water is responsible for the variety of aquatic organisms throughout the various seasons?

Selecciona una de las siguientes respuestas posibles:

  • adhesion

  • cohesion

  • High specific heat

  • Solid water is less dense than liquid water

Explicación

Pregunta 5 de 6

1

Nuclear reactors can run into problems if the reactor and fuel rods get too hot. They will use water as a coolant to keep the reactor core at a proper temperature. What property of water is this demonstrating?

Selecciona una de las siguientes respuestas posibles:

  • Cohesion

  • high specific heat

  • universal solvent

  • adhesion

Explicación

Pregunta 6 de 6

1

A polar bond is created by unequally shared electrons. Nonpolar bonds are equally shared electrons. Which statement best explains why water will dissolve polar compounds and NOT non polar compounds?

Selecciona una de las siguientes respuestas posibles:

  • Polar compounds are charged molecules with + and – ends. These charged areas will attract other charged areas of other molecules.

  • Polar and nonpolar are opposite molecules. Opposite molecules will dissolve opposites.

  • Polar molecules are like ice, they are very cold; nonpolar are warm

  • Ionic are the best to be dissolved because they have opposite charges.

Explicación

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