A reaction is performed in a beaker with a temperature probe recording the temperature changes of the reaction.  If the temperature began at 15.0 degrees Celsius and ended at 27.5 degrees Celsius.  If the reaction is our system, is the system endothermic or exothermic?

• Exothermic

• Endothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

When sodium hydroxide is added to hydrochloric acid, the temperature reading on the thermometer is ______________ and the reaction name is __________________

• decreasing

• increasing

• constant

• neutralisation

• titration

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4

H₂ + ½ O₂ --> H₂O + 285kJ is an example of a(n)

• Electrical equation

• Heat equation

• Thermochemical equation

Tags

NGSS.HS-PS1-4

If the enthalpy ter (ΔH) is negative the reaction is ____.

• Endothermic

• Exothermic

• Neutral

What type of reaction is this?

• Exothermic

• Endothermic

• Kinetic

• Potential

Tags

NGSS.HS-PS1-4

ΔH means:

• temperature

• calorimetry

• enthalpy

• syntropy

Tags

NGSS.HS-PS3-1

A positive ΔH means that:

• In order for the reaction to happen, heat must be input. It is exothermic

• In order for the reaction to happen, heat must be input. It is endothermic.

• When the reaction happens, heat is released. It is exothermic

• When the reaction happens, heat is released. It is endothermic

Tags

NGSS.HS-PS3-1

• negative

• positive

Tags

NGSS.HS-PS1-4

the study of energy changes that occur during chemical reactions and changes in state

Tags

NGSS.HS-PS1-4

ΔH is the same thing as:

• temperature

• q

• m

• C