Mixtures: AP 1.4

Which of these are mixtures?

• A

• B

• C

• D

Comparing the samples, which will have the highest percentage of the black element?

• A

• B

• C

• D

Comparing the samples, which will have the lowest percentage of the black element?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-3

Pure NaCl is 61% chlorine by mass. If you analyze a sample and determine it is 75% chlorine by mass, what can you conclude about its purity?

• It is pure NaCl

• It contains NaCl and NaI

• It contains NaCl and KCl

• It contains NaCl and LiCl

Tags

NGSS.HS-PS1-7

The mass % of C in pure glucose (C₆H₁₂O₆) is 40%. If you analyze a sample of glucose and the mass % carbon is 38%, which of the following impurities could be to blame?

• Water

• Ribose C₆H₁₂O₅

• Fructose (isomer of glucose) C₆H₁₂O₆

• Sucrose, C₁₂H₂₂O₁₁

Which columns in the table above provide all the information necessary to determine the mole ratio of Ca to Mg in a rock? Circle all the columns that are ABSOLUTELY NECESSARY.

• Molar mass of Ca (g/mol)

• Mass of Ca in sample (g)

• Mass of Mg in sample (g)

• Total mass of sample (g)

• Molar Mass of of Mg (g/mol)

Tags

NGSS.HS-PS1-7

A student is given two 10g samples, each a mixture of only NaCl(s) and KCl(s) but in different proportions. Which of the following pieces of information could be used to determine which mixture has the higher proportion of KCl(s)?

• The volume of each mixture

• The mass of Cl in each mixture

• The number of isotopes of Na and K

• The reaction of each mixture with water

• Increases the % H

• decreases the % H

• no change

• water and CO has a higher % Oxygen

• water and CO₂ has a higher % oxygen