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A group of atoms that acts as a unit is called a[n]

Select one:

a. mixture.

b. compound.

c. element.

d. molecule.

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The chemical formula for water, H2O, means that each water molecule contains

Select one:

a. two hydrogen atoms and zero oxygen atoms.

b. one hydrogen atom and two oxygen atoms.

c. two hydrogen atoms and one oxygen atom.

d. two hydrogen atoms and two oxygen atoms.

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Lead has a density of 11.3 g/cm3 and a mass of 282.5 g. What is its volume?

Select one:

a. 2500 cm3

b. 250 cm3

c. 25 cm3

d. 2.5 cm3

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Daphne placed a glass of water with a thermometer in it inside a freezer. She took the temperature every 2 minutes for 30 minutes. The data she recorded are shown in the graph below. What is the most likely cause of the temperature remaining constant during the time intervals between the 12- and 22-minute marks?

Select one:

a. The water

Explanation / Answer

molecule option c d = m/v     v = m/d = 25cm3 option a KE decreases option b liquid molecules move centrifuge or filter , mostly centrifuge a new substance is formed rust forming physical melting

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