Endothermic and Exothermic reactions

In _____________________ reactions heat energy is absorbed.

Panam carries out an exothermic reaction, which preliminary work can she do before the experiment to tell that heat is generated?

• using a thermometer

• using a stop watch

• using a water bath

• none

In serbet sweets there is a mixture of dry ______________ and sodium hydrogen carbonate.

When we eat refreshing sweets the chemicals mix with the ______________ in our mouth.

Ice melting is an example of _______________ reaction.

Ice melts due to:

• vibration of particles

• gain in kinetic energy

• both

• none

In ice packs, water and ________________ are present in two compartments.

• lead nitrate

• copper nitrae

• silver nitrate

• ammonium nitrate

The ice pack absorbs _________________ from the skin.

• cold

• heat

• both

• none

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

Ali is mixing chemical A with chemical B and notices a fall in temperature, while writing the conclusion he decides that it is a _______________ reaction.

While eating refreshing sweets we feel cool because ____________ is absorbed from our mouth.

• saliva

• heat

• cold

• none