29. Figure 7 shows the structural formulae of two organic compounds. Rajah 7 menunjukkan formula struktur bagi dua sebatian organik.
H
OH
11 - Ć=C-Ć=0
H
OI
( c¿
-&-c-6=0
Figure 7 / Rajah 7
Which of the following is true about the two compounds?
Antara berikut, yang manakah benar tentang kedua-dua sebatian itu?
A
hidrogen.
B
Both compounds react with magnesium to produce hydrogen gas.
Kedua-dua sebatian bertindak balas dengan magnesium untuk menghasilkan gas
Both compounds decolourise potassium manganate(VII).
Kedua-dua sebatian menyahwarnakan kalium manganat(VII).
Both are neutral compounds with sweet smell.
Kedua-dua merupakan sebatian neutral yang berbau harum.
Both compounds are insoluble in water.
Kedua-dua sebatian tidak terlarut dalam air.
C С
D

Dying the folding patterns of protein molecules can microbiologists better understand cellular processes as well as some diseases, such as alzheimer’s, that are caused by proteins that have misfolded. the folding of these complicated molecules can be simulated on computers, but it takes a lot of processor power and time for even expensive supercomputers to do this. a group of researchers at stanford university developed software that can be used to distribute the processing of data to anyone who is willing to donate time on their idle personal computers. as a result, the researchers have been able to achieve protein-folding simulations that are far better than those other computing methods have done. which statement best describes the work of these researchers? the work is not scientific because the data are not processed in one location. the work is not scientific because the simulations are not reproducible. the researchers applied creativity to solve a problem in running an experiment. the researchers used only well-established scientific techniques.

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

Which statements are true concerning mineral formation? check all that apply. the slower the cooling, the larger the crystals. the faster the cooling, the smaller the crystals. crystals formed from magma are smaller than crystals formed from lava. minerals can only form in solutions when the solution is heated deep underground. when a solution cools, elements and compounds leave the solution and crystallize as minerals. minerals formed from hot water solutions can form narrow channels in the surrounding rock.