📚 مادة الاختبار: Science — Preparatory 2
تدريب عام: Unit 1 : Thermal Energy and Changes of Matter (Science) - Preparatory 2
سؤال من
السؤال 1
How does increasing the mass of a dissolved salt in a constant volume of solvent affect the thermal energy released or absorbed during dissolution?
السؤال 2
What salt is typically found in instant cold compresses, and what is its main function?
السؤال 3
Nesting two polystyrene cups together would decrease thermal insulation during an experiment.
السؤال 4
Why is water not effective for extinguishing oil or petroleum fires?
السؤال 5
Which characteristic correctly describes an exothermic reaction?
السؤال 6
What is the primary role of the compressor in a refrigerator's cooling cycle?
السؤال 7
What is the energy characteristic of the process of breaking chemical bonds?
السؤال 8
What is the safest procedure for diluting concentrated acids?
السؤال 9
What characteristic is represented by an energy diagram for an endothermic reaction?
السؤال 10
In an experiment designed to determine the thermal change accompanying dissolution where different masses of a salt are used, what typically represents the independent variable?
السؤال 11
The compression stage in the refrigeration cycle causes the refrigerant gas's temperature to decrease.
السؤال 12
In the reaction CuO(s) + H2(g) → Cu(s) + H2O(v), which process does copper oxide undergo?
السؤال 13
What color is anhydrous cobalt chloride?
السؤال 14
Anhydrous cobalt chloride is typically blue, while its hydrated form is pink.
السؤال 15