Heat of Reaction

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

• Red, because the activation energy is larger
• Blue, because the activation energy is lower
• both reaction progress at the same rate

Tags

NGSS.HS-PS1-4

In an exothermic reaction, heat is ...

• taken in
• given out

Tags

NGSS.HS-PS1-4

The ______________is required to break the bonds of the reactants.

• Carbonic energy

• Activation energy

• Plutonic energy

• Energi Gaib

Tags

NGSS.HS-PS1-4

Compound P is dissolved in water in a test tube. It is noted that the wall of the test tube becomes cold. Which of the following is most probably compound P?

• Sulphuric acid

• Ammonia

• Hydrochloride Acid

• Ammonium chloride

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Which of the following regarding an endothermic reaction is correct?

• Chemical energy is transformed to heat energy

• The temperature of the surroundings rises

• Heat is released

• The energy content of the product is higher than the energy content of the reactants

Tags

NGSS.HS-PS1-4

In an experiment, 2 g of magnesium powder are added to 50 cm³ of 0.2 mol dm^–3 zinc sulphate solution. The temperature of the mixture increases by 12°C. What is the heat of displacement in this experiment?

[Spesific heat capacity of a solution = 4.2 Jg^–1 °C^–1; Relative atomic mass of Mg = 24]

• – 50.4 kJ mol^-1

• – 100 kJ mol^-1

• – 252 kJ mol^-1

• – 340 kJ mol^-1

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

NGSS.HS-PS3-1

• A

• B

• C

• D

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

What sort of reaction happens when an acid and an alkali are mixed?

• Neutralisation

• Combination

• Acidifying

• Displacement

Neutralisation reactions

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4