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Science
Engineering
Chemical Engineering
6.4. Matter changes
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Gravity
Chemical reactions or physical changes
Terms in this set (7)
Types of changes in matter
Physical
Chemical
Physical change
A process that changes the shape or the form of matter.
The mass stays the same.
Tend to be reversible.
Examples: changes of state; breaking a glass...
Chemical change
A process that transformes matter into new substances.
The mass changes.
Tend to be irreversible.
Examples: iron rusting; burning wood...
Chemical reaction
Chemical change
Involved in a Chemical reaction
Reactants
Products
Energy
Reactant
The substance that transforms during the Chemical Reaction.
Product
The substance resultant of a Chemical Reaction.
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Verified questions
ENGINEERING
Superheated water vapor at 180 psia and $500^{\circ} \mathrm{F}$ is allowed to cool at constant volume until the temperature drops to $250^\circ F.$ At the final state, determine (a) the pressure, (b) the quality, and (c) the enthalpy. Also, show the process on a T-v diagram with respect to saturation lines.
ENGINEERING
Determine the temperature, in $^{\circ} \mathrm{C},$ of air at 30 bar and a specific volume of $0.013 \mathrm{m}^{3} / \mathrm{kg}.$
ENGINEERING
Suppose a small cannonball weighing 16 lb is shot vertically upward with an initial velocity $v_0 = 300$ ft/s. (a) Suppose air resistance is ignored. If the positive direction is upward, then a model for the state of the cannonball is given by $d^2s/dt^2 = -g$. Since $ds/dt = v(t)$ the last differential equation is the same as $dv/dt = -g$, where we take $g = 32$ ft/s$^2$. Find the velocity $v(t)$ of the cannonball at time $t$. (b) Use the result obtained in part (a) to determine the height $s(t)$ of the cannonball measured from ground level. Find the maximum height attained by the cannonball.
ENGINEERING
Refrigerant 134a is the working fluid in a vaporcompression heat pump that provides 35 kW to heat a dwelling on a day when the outside temperature is below freezing. Saturated vapor enters the compressor at 1.6 bar, and saturated liquid exits the condenser, which operates at 8 bar. Determine for isentropic compression a. the refrigerant mass flow rate, in kg/s. b. the compressor power, in kW. c. the coefficient of performance. Recalculate the quantities in parts (b) and (c) for an isentropic compressor efficiency of 75%.
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