There are four substances, a, b c and d. a and c are pure substances. they cannot be broken down into anything simpler by chemical methods. b consists of a and d, which are not chemically bonded together. d is a pure substance. we can decompose d into a and c using chemical methods. how would we classify substance a, c, and d? a: substances a and c are elements, because they are pure substances that bond together to make substance d and cannot be broken using chemical processes . substance d is a mixture, because it is a pure substance made up of a and c. b: substances a and c are compounds, because they are pure substances that bond together to make substance d and cannot be broken using chemical processes . substance d is a mixture, because it is a pure substance made up of a and c. c: substances a and c are elements, because they are pure substances that bond together to make substance d and cannot be broken using chemical processes. substance d is a compound, because it is a pure substance made up of a and c. d: substances a, c, and d, are elements. all pure substances are elements.

Explain which atom l or m is more stable and why

Lem 2 the data below are for the system ethyl propyl ether (1)-chloroform (2) at 0.5 bar. use the data to answer the following questions (all questions refer to p d 0: 5 bar). a) what are the boiling points of the pure components at 0.5 bar? b) a mixture with the overall composition z1 d 0: 1 is brought to 47.6ä±c, 0.5 bar. what is the phase? c) 100 mole of a mixture with z1 d 0: 1 (state a) is mixed with 22 mole of pure ethyl propyl ether vapor (state b). the mixing takes place at 47.6 ä±c, 0.5. bar. what is the phase of the resulting mixture (state c)? if the state is a v/l mixture report the number of moles and mole fractions in each phase. d) plot the txy graph and show states a, b and c. the graph must be done by computer and should be properly annotated. ethyl propyl ether (1) - chloroform (2) at 0.5 bar t ( ä±c) x1 y1 t ( ä±c) x1 y1 42.9 0.000 0.000 49.0 0.470 0.455 43.0 0.020 0.010 49.1 0.520 0.520 43.9 0.065 0.029 48.9 0.567 0.592 45.4 0.156 0.089 48.3 0.652 0.720 46.4 0.215 0.142 47.6 0.745 0.815 47.6 0.296 0.223 46.7 0.822 0.872 48.3 0.362 0.302 45.7 0.907 0.937 48.7 0.410 0.375 44.6 1.000

Select all that apply. a beta particle: is electromagnetic energy is an electron has zero charge is emitted from the nucleus has a +2 charge has a -1 charge