6.4.1 Exothermic and endothermic reactions

True or false: A change in state is a chemical reaction

• True - something melting would be an example of a chemical reaction

• False - a change in state is a physical change

Tags

NGSS.MS-PS1-2

What term is given to a reaction which transfers heat energy to the surroundings?

• Endothermic

• Reversible

• Exothermic

• Exotermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-6

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

• Endothermic

• Decomposition

• Exothermic

• Indothermic

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

• The solution at the end is acidic

• The reaction is reversible

• The reaction is exothermic

• The reaction is endothermic

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

if more heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants

• Exothermic

• Endothermic

• Exotermic

• Endotermic

Tags

NGSS.HS-PS1-4

if less heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants

• Endothermic

• Exotermic

• Exothermic

• Entrothermic

Tags

NGSS.HS-PS1-4

Which is NOT an example of something you could observe that would suggest a chemical reaction is taking place?

• melting

• fizzing

• smells

• temperature change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A lizard egg needs a temperature of 26-30 ° C to hatch properly. You place it next to a pouch of water which is 22 °C. What type of chemical do you need for the egg? 

• Calcium chloride because it will be endothermic.
• Calcium chloride because it will be exothermic. 
• Citric acid because it will be exothermic. 
• Citric acid because it will be endothermic. 

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What instrument would you use to detect an endothermic or exothermic reaction?

• triple beam balance

• ruler

• thermometer

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-6

NGSS.MS-PS3-4

When a candle is lit hydrocarbons are combusting. An exothermic reaction is occuring. Energy is being _________________ .

• absorbed

• frozen

• destroyed

• released

Tags

NGSS.HS-PS1-4