A(n) ____________________ is a substance that causes a chemical reaction to occur without undergoing any change to itself.
Fill in the blank(s) with the appropriate word(s).
catalyst
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A device operates under steady-state, steady-flow conditions. The device receives 45.2 kW of heat, the mass flowing in contains 165 kW of energy, and the device produces 65.6 kW of power. Determine the rate of energy flowing out of the system with the mass flowing through the outlet.
Given: Steady-State, steady-flow, so dE/dt = 0; Q?=45.2 kW; E?massflow,in=165 kW; W?=65.6 kW What will be an ideal response?
A support pole makes an angle of 40°? with the? main vertical pole. The angle the support pole makes with the horizontal ground is:
A. ?40°? B. ?50°? C. ?140°? D. ?180°?
Pest outbreaks are natural, but how have they been increased by intensive agricultural practices?
What will be an ideal response?
Which of the following factors minimize the hazards associated with excavation work?
A. Traffic in the vicinity. B. Proximity of structures or equipment. C. Soil factors. D. All of the above