OCR AS Chemistry Part 1

1)  How many moles of CO₂ are in 88.0 grams?

• a. 2.00 mol
• b. 3.14 mol
• c. 0.500 mol
• d. 7.63 mol

1)  How many grams of Cl₂ are in 0.890 moles?

• a.63.2 g
• b. 31.6 g
• c. 1.48x10-24 g
• d. 19.9 g

1)  What is the molar mass of K₂Cr₂O₇?

• a.  3.4x10-3 g/mol
• b.     107.1 g/mol
• c.     294.2 g/mol
• d.     179.4 g/mol

Lone pairs around the oxygen atom of a water molecule play no role in determining its molecular geometry which has what shape?

• True;
  bent
• False;
  bent
• True;
  linear
• False;
  linear

What kind of chemical bond forms between a metal and a nonmetal?

• Covalent bond
• Ionic bond
• Can be either covalent or ionic
• Hydrogen bond

Tags

NGSS.HS-PS1-1

What two types of atoms make a covalent bond?

• 2 Nonmetals
• 1 Nonmetal and 1 Metal
• 2 Metals
• 2 Noble Gases

Tags

NGSS.HS-PS1-1

Choose the correct shape for this molecule:

• linear
• Trigonal pyramidal
• Bent
• Tetrahedral

Choose the correct shape for this molecule:

• Bent
• Trigonal pyramidal
• Tetrahedral
• Trigonal planar

Tags

NGSS.MS-PS1-1

A molecule consists of four bonds and no lone pairs. What is its structure? 

• square planar
• tetrahedral
• linear
• square pyramidal 

Choose the correct shape for this molecule:

• Trigonal planar
• Trigonal pyramidal
• Bent
• Tetrahedral