DA 3 Review

How many electrons are present in a Pb4+ ion?

• 4

• 78

• 82

• 86

[TEST QUESTION: DRAG-and-DROP: Bonding and intermolecular forces directly impact the physical properties of materials. What type of solid is described in each statement? Move ONE answer to each box]

Which one is typically soft and has low melting points?

• Ionic

• Metallic

• Molecular

• Covalent network

[TEST QUESTION: DRAG-and-DROP: Bonding and intermolecular forces directly impact the physical properties of materials. What type of solid is described in each statement? Move ONE answer to each box]

Which type has charges present and high melting points?

• Metallic

• Ionic

• Molecular

• Covalent network

[TEST QUESTION: DRAG-and-DROP: Bonding and intermolecular forces directly impact the physical properties of materials. What type of solid is described in each statement? Move ONE answer to each box]

What type is described as a network of atoms, strong, and typically has the highest of all melting points?

• Metallic

• Ionic

• Molecular

• Covalent network

[TEST QUESTION: DRAG-and-DROP: Bonding and intermolecular forces directly impact the physical properties of materials. What type of solid is described in each statement? Move ONE answer to each box]

Which type has properties that vary widely and tends to be conductive and malleable?

• Metallic

• Ionic

• Molecular

• Covalent network

Calculate the molar mass of (NH₄)₂C₂O₄.

• 100.00 g/mol

• 124.10 g/mol

• 240.78 g/mol

• 316.20 g/mol

What is the total number of atoms of all the elements in 2.50 moles of Al₂(SO₄)₃?

• 1.02 x 10²⁴ atoms

• 1.51 x 10²⁴ atoms

• 2.56 x 10²⁵ atoms

• 5.20 x 10²⁵ atoms

Ca₃(PO₄)₂ has a molar mass of 310.174 g/mol. Determine the percent composition of phosphorus in Ca₃(PO₄)₂ to the hundredth place. [TEXT ENTRY on DA]

• 19.97%

• 15.23%

• 25.50%

• 10.75%

How many molecules are there in one mole of Barium chloride?

• 1.50 x 10^23

• 6.02 x 10^23

• 1.20 x 10^24

• 2.40 x 10^24

What is the percentage by mass of sodium (Na) in a formula unit of sodium hydrogen carbonate (NaHCO₃)?

• 44.2%

• 37.7%

• 27.4%

• 16.7%