Chemistry Final Review #1

You calculate that 213,000 m/s is the answer to a problem. How many significant digits does this number have?

• 6

• 3

• It’s not possible to know how many significant figures are in an answer without knowing its accepted value.

• It's not possible to know how many significant figures are in an answer without knowing its percent error.

You calculate that 319,000,000 m is the answer to a problem. What is the answer in scientific notation?

• 3.19 x 10⁸

• 31.1 x 10⁹

• 3.19 x 10¹⁰

• .319 x 10⁸

You calculate the following answer to a problem: 12.655 cm. You are asked to round your answer to four significant figures. Which answer is correct?

• 12.66 cm
• 12.65 cm
• 12.60 cm
• 12.70 cm

Elements in the same group have the same ____.

• number of protons
• number number of neutrons
• # valence electrons
• color

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Most of the elements in groups 16-18 are classified as ____.

• metals
• nonmetals
• transition metals
• air

Tags

NGSS.HS-PS1-1

What is the trend in atomic radii as you move from left-to-right across a period?

• increases

• decreases

• does not change

• all of the above

In which of the following pair is the second particle listed larger than the first?

• K, Ga
• Pb, C
• Br, I
• Na, Li

Elements in the same group have similar chemical properties because

• their atoms are about the same size.
• they have a similar atomic mass.
• they have the same number of valence elections.
• they have a diagonal relationship.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Alkaline Earth Metals form ions with a

• +2

• -2

• +1

• -1

Tags

NGSS.HS-PS1-2

Elements with a higher atomic number than uranium are

• always found combined in compounds
• found as uncombined elements.
• not found in nature.
• found both as uncombined elements and in compounds.