What type of chemical reaction occurs when beryllium combines with oxygen to form beryllium oxide ?

Could someone . i have tried to solve myself but my calculation is off

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.