Math and Moles Test Review

Conversions must have what?

• No Units

• Units

• Bunnies

• X10

Tags

NGSS.HS-PS4-1

Significant Figures for a calculated answer should be based on?

• The number of decimal places on the periodic table

• The number of decimal places in 1000

• The given number in the problem

• Depends

Which rules are needed to determine the correct number of sig figs in 0.0592

• Leading zeros are not significant

• Sandwiched zeros are significant

• Trailing zeros are not significant without a decimal

• Non-zero digits are always significant

Convert 46 into scientific notation:

Mathematical Equivalence

ON

What units are used for MOLAR MASS?

• g

• mol

• g/mol

• kg/mg

Tags

NGSS.HS-PS1-7

What is the molar mass of NaCl (sodium chloride)?

• 35.45 g/mol

• 58.44 g/mol

• 58 g/mol

• 60.00 atoms

Match the number of sig figs for each number:

• 1

• 91066

• 5

• 600

• 3

• 0.007020

• 6

• 4300.00

• 4

• 4.77x10^9

Convert 4.19x10^-4 to standard notation:

• 41900

• 4.19

• 0.000419

• 0.419

Convert 3,529,000 to scientific notation with 2 sig figs:

Mathematical Equivalence

ON

Calculate the molar mass of Mg3(PO4)2

• 262.855

• 262 g

• 72.92 g/mol

• 262.86 g/mol