IAL Chemistry Unit 1 Paper October 2021_1

What is the formular for parts per milllion?

• [mass of solute (g)/ total mass of solution (g) ] * 10^6

• (mass of solute / total volume of solute) * 10^6
• (mass of solute / total mass of solute) * 10^6
• (mass of solute / total volume of solution) * 10^6

10 milligrams is equal to how many grams?

• 1 gram
• 0.01 grams
• 10 grams
• 0.1 grams

1 kilogram is equal to how many grams?

• 750
• 1000
• 2000
• 500

ppm = [(0.01g /1000 g) x 10^6]

• ppm = 10
• ppm = 1
• ppm = 0.001
• ppm = 100

What does one mole of a substance contain?

• One thousand particles
• Avogadro's number of particles
• One million particles
• One dozen particles

What is Avogadro's number of particles?

• 6.022 x 10^23
• 4.022 x 10^23
• 7.022 x 10^23
• 5.022 x 10^23

Why is Avogadro's number (the mole) such a large value?

• It is a small value that represents the number of atoms or molecules in one mole of a substance.
• It is a random number with no scientific significance.
• It is a medium-sized value that represents the number of atoms or molecules in one mole of a substance.
• It represents the number of atoms or molecules in one mole of a substance.

What does Avogadro's number represent?

• A. The number of molecules in 1 kg of water.

• B. The number of atoms in 1 kg of iron.

• C. The number of entities in 12 grams of carbon-12.

• D. The number of ions in 1 mole of sodium chloride.

Suppose you wanted to know how many hydrogen atoms are in one cup of water. What would you use?

• Chemical formula for carbon dioxide (CO2)
• Number of electrons in water
• Number of protons in water
• Avogadro's number and Chemical formula for water (H2O)

Suppose you wanted to know how many hydrogen atoms are in one cup of water. What would you use?

• Chemical formula for carbon dioxide (CO2)
• Number of electrons in water
• Number of protons in water
• Avogadro's number and Chemical formula for water (H2O)