CHEM 101- Pretest

1.    Which molecule is a dipole?

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Which is the weakest type of intermolecular force?

• London dispersion force

• hydrogen bonding

• ion-dipole

• dipole-dipole

Which of the following is the most polar covalent bond?

• Cl-Cl

• Cl-O  

• H-Cl

• N-Cl

These are forces that holds within a molecule.

• Ion-dipole interaction

• Dipole-dipole interaction        

• Intermolecular Forces

• intramolecular Forces

Substance that changes the rate of reaction but is neither changed nor consumed is called?

• catalyst

• product         

• reactant

• reagent 

What happens to the rate of reaction when 5% HCl is used instead of 15% HCl to react CaCO₃?

• It becomes faster      

• It becomes slower

• It stays the same

• No reaction will take place

How many grams does 0.027 mol of copper weigh? (Molar mass Cu: 63.55 g/mol)

• 0.00042 g        

• 1.7 g

• 17 g  

• 24000 g

If you calculate the maximum amount of product that could be obtained in a chemical reaction, you are calculating the ______.

• Actual yield  

• Experimental yield   

• percent yield

• theoretical yield

What is the reactant that is not totally consumed in the reaction?

• limiting           

• excess

• experimental

• actual

Magnesium hydroxide, the active ingredient in milk of magnesia, neutralizes stomach acid, primarily HCl, according to there action: Mg(OH)₂ +2HCl→2H₂O+MgCl₂ . How much HCl in grams can be neutralized by 5.50 g of Mg(OH)2? (Molar masses: Mg(OH)2 = 58.33 g/mol ; HCl = 36.46 g/mol)

• 4.5 g HCl         

• 5.46 g HCl       

• 6.88 g HCl

• 3.75 g HCl