3. An endothermic reaction can be expressed by writing the enthalpy term

A. as a negative value on the product side in the equation.

B. as a negative value in , H notation.

C. On the product side of an equation.

D. On the reactant side of an equation.

What is the name of the founder of chemistry?

Grade 9 chemistry:

A metal with a mass of 0.74 kg occupies a volume of 35 cm3. Calculate the density of the metal. Use G.R.A.S.P.

Grade 9 chemistry:

 Bob takes a break from singing and fills a balloon indoors where the temperature is 21 degrees Celsius (normal room temperature). Then, he puts the balloon in the fridge, where the temperature is 2 degrees Celsius. What will happen to his balloon? Why does this happen?