Chemical Reactions Quiz

Which of the following statements best describes when concentrated H₂NH₂ is added to water, the solution gets colder (consider H₂NH₂ to be the system, and the water to be the surroundings)?

• endothermic reaction

• exothermic reactions

• thermoneutral

• none of these choices

Which of the following statements best describes when a metal block is added to water of equal temperature (consider the metal block to be the system, and the water to be the surroundings)?

• endothermic

• thermoneutral

• exothermic

• none of these answers are correct.

If the heat (q) value of a chemical reaction is negative, then we can conclude that a ________ reaction has occurred.

Based on the figure below which of the following reaction coordinate diagrams is describing an endothermic process?

• A

• B

• Both A and B

• None of these options

Based on the figure below which of the following reaction coordinate diagrams is describing an exothermic process?

• A

• B

• Both A and B

• None of these options

According to figure 2, which of the following substances would require the most amount of energy to increase its temperature by 1°C if you had 1 gram of that substance?

• Sodium Chloride

• Granite

• Gold

• Glycerin

According to figure 2, which of the following substances would require the least amount of energy to increase its temperature by 1°C if you had 1 gram of that substance?

• Granite

• Glycerin

• Sodium Chloride

• Gold

In which direction does heat flow spontaneously between two objects?

• Heat flows from the object of greater density to the object of lower density

• Heat flows from the object of lower density to the object of greater density

• Heat flows from the object of higher temperature to the object of lower temperature

• Heat flows from the object of lower temperature to the object of higher temperature

The process below is the thermochemical equation for photosynthesis.

6H₂O_(l) + 6CO_2(g) ---> C₆H₁₂O_6(s) + 6O_2(g)       Δq = +2803 kJ/mol

The reverse reaction of photosynthesis is the equation for aerobic cellular respiration. Which statement best describes cellular respiration?

• Consumes carbon dioxide (CO2)

• Produces oxygen (O2)

• Endothermic

• Exothermic

The Nutrition Facts for Takis snacks states that 1 serving contains 17.0 grams of carbohydrate, 7.0 grams of fat and 2.0 grams of protein.

Using the chart below, which biomolecule contains the most calories in 1 serving of Takis snacks?

• Protein

• Fat

• Carbohydrates