Chemistry, 18.09.2021 23:50 ronitgoswami
Pls helpp (no links)
Which statement best describes the difference between a physical property and a chemical property?
A. Physical properties can be observed without changing a substance, but chemical properties are only observable when matter changes into a new substance.
B. Physical properties describe physical appearance, but chemical properties describe chemical composition.
C. Physical properties can be measured with a scale, but chemical properties can't be measured.
D. Physical properties are unchanging, even when a substance undergoes a chemical reaction, but chemical properties constantly change.
Answers: 1
Chemistry, 22.06.2019 10:50
A100 kmol/h stream that is 97 mole% carbon tetrachloride (ccl4) and 3% carbon disulfide (cs2) is to be recovered from the bottom of a distillation column. the feed to the column is 16 mole% cs2 and 84% ccl4, and 2% of the ccl4 entering the column is contained in the overhead stream leaving the top of the column. calculate the mass and mole fractions of ccl4 in the overhead stream, and determine the molar flow rates of ccl4 and cs2 in the overhead and feed streams. 12. mw_ccla- 153.82; mw_cs2-76.14.
Answers: 3
Chemistry, 22.06.2019 19:30
Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!
Answers: 2
Chemistry, 23.06.2019 14:00
Which is not true regarding reaction rates? (2 points) catalysts are not used up in the reaction. catalysts speed up reactions by lowering the activation energy. reaction rates decrease as the concentration of reactants decrease. during reactions, concentrations of all reactants decrease at the same rate.
Answers: 1
Chemistry, 23.06.2019 16:00
Be sure to answer all parts. the catalytic destruction of ozone occurs via a two-step mechanism, where x can be any of several species: (1) x + o3 Γ’β β xo + o2 [slow] (2) xo + o Γ’β β x + o2 [fast] (a) write the overall reaction. o3 + o Γ’β β 2 o2 o3 + xo Γ’β β x + 2 o2 xo + x + o3 + o Γ’β β xo + x + 2 o2 x + o3 Γ’β β xo + o2 (b) write the rate law for each step (using k for the rate constant). reaction 1: reaction 2: k[x][o2] k[xo][o2] k[x][o3] k[xo][o3] k[xo][o2] k[x][o] k[x][o2] k[xo][o] (c) x acts as a and xo acts as a catalyst intermediate intermediate catalyst (d) high-flying aircraft release no into the stratosphere, which catalyzes this process. when o3 and no concentrations are 3 Δβ 1012 molecule/cm3 and 9.9 Δβ 109 molecule/cm3, respectively, what is the rate of o3 depletion? the rate constant k for the rate-determining step is 6 Δβ 10Γ’β15 (cm3)2/moleculeΓ’Β·s. give your answer in scientific notation. use one significant figure in your answer. Δβ 10 molecule/s
Answers: 2
Pls helpp (no links)
Which statement best describes the difference between a physical property and...
Business, 02.03.2021 18:50
Health, 02.03.2021 18:50
Mathematics, 02.03.2021 18:50
English, 02.03.2021 18:50
Arts, 02.03.2021 18:50
Mathematics, 02.03.2021 18:50
English, 02.03.2021 18:50
Mathematics, 02.03.2021 18:50
Computers and Technology, 02.03.2021 18:50
Mathematics, 02.03.2021 18:50
History, 02.03.2021 18:50
Mathematics, 02.03.2021 18:50
Mathematics, 02.03.2021 18:50
Mathematics, 02.03.2021 18:50