General Chemistry Concepts

Consider chemical reactions between main group metals and non-metals. Based on known bonding patterns, is KHe possible?

• possible

• not possible

Select the chemical formula for an element.

• H2O

• NaCl

• Cl2

• NH3

Suppose 5.00g of Zn metal is completely consumed in an HCl solution to produce zinc(II) chloride (ZnCl₂) and hydrogen gas (H₂) according to the following reaction: Zn(s) + 2HCl(aq) -----> ZnCl₂(aq) + H₂(g) Part A How many moles of ZnCl₂ are produced?

• 0.0765 moles

• 0.0500 moles

• 0.100 moles

• 0.0250 moles

Suppose 5.00g of Zn metal is completely consumed in an HCl solution to produce zinc(II) chloride (ZnCl₂) and hydrogen gas (H₂) according to the following reaction: Zn(s) + 2HCl(aq) -----> ZnCl₂(aq) + H₂(g) Part B How many grams of H₂ are produced?

• 0.153 g

• 0.500 g

• 0.065 g

• 0.250 g

C3H6 + O2 → CO2 + H2O When the equation above is balanced and all coefficients are reduced to their lowest whole-number values, the coefficient for H2O is

• 2

• 3

• 4

• 6

A solid object at 10°C is placed in an insulated container filled with water at 50°C. Which of the two statements below must be accurate?

• The final temperature of the water will be close to 50°C.

• The heat lost by the water will be absorbed by the object.

• The temperature of the water and the object will approach the same value.

• The final temperature of the system will be 30°C.

Consider chemical reactions between main group metals and non-metals. Based on known bonding patterns, is NaO₂ possible?

• possible

• not possible

Consider chemical reactions between main group metals and non-metals. Based on known bonding patterns, is MgCl₂ possible?

• possible

• not possible

A hot and a cold object are placed in contact with one another in a closed system. Which of the graphs below correctly represent how the temperature of the hot object (in red) and the cold object (in blue) will change with time?

• Top left graph

• Top right graph

• Bottom left graph

• Bottom right graph

Consider chemical reactions between main group metals and non-metals. Based on known bonding patterns, is CaF possible?

• possible

• not possible