LUC Lurrect answer
1) Which of the following reaction is fast
a) 2g sodium carbonate + 1 M HCl aci
b) 2.5g Na, Co, + 1M HCl acid
c) 0.5g Na2CO3 +0.5M HCl acid
d) 2,5gNa2CO3 + 1MHCl at30c
2) Barium sulphate can be prepared by mixing
a) Barium carbonate and calcium salphate
B) Barium nitrate and lead sulphate
c) Barium Chloride and copper sulphate
d) Bao and Zinc sulphate
3) Which of the following elements can reduce Zinc oxide to Zn atom
a) Mg
c)Ag
b) Lead
d) Fe

Aballoon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon?

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.

The crust of earth may a- continets and ocean floors. b-continents only. c-layers of sedimentary rocks and continents. d-all of the above