Exo - Endo reaction, Reactivity and Rate of reaction WS

In an exothermic reaction, heat is ...

• taken in
• given out

In an endothermic reaction, heat is ...

• taken in

• given out

During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 

• Warm
• Cold

If a chemical reaction is EXOTHERMIC, the temperature would....

• Stay the same
• Increase
• Decrease

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

• It is an exothermic reaction

• It is an endothermic reaction

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

• absorbed

• frozen

• destroyed

• released

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• bubbles of gas appear
• dissolving

HCl reacts with Zn giving off heat

• endothermic
• exothermic

During chemical reactions, bonds are...

• broken only

• formed only

• both broken and formed

• none of the above are correct

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

• triple beam balance

• ruler

• thermometer