VincenTragosta - Tanya, Jawab, dan Belajar Tanpa Batas Logo

Questions in chemistry

[Terjawab] What is important for you to do when working with a compressed gas cylinder? A. Use heat to raise the gas pressure B. Refill the cylinder when it is empty C. Make sure the cylinder and the work area are properly marked D. Use a single hose with more than one gas passage

[Terjawab] Listen Oxides of nitrogen result from a combination of nitrogen and A) oxygen. B) hydrogen. C) carbon. D) argon.

[Terjawab] What is the formula for sulfuric acid? A. $HSO _4$ B. $H _2 SO _4$ C. $SO _2$ D. $H _2 SO _3$

[Terjawab] What type of salts are alums? Why is tetraoxosulphate (VI) acid able to produce two (2) types of salts?

[Terjawab] How many protons are in oxygen-18? ${ }_8^{18} O A. 8 B. 10 C. 18

[Terjawab] What is the formula for phosphoric acid? A. [tex]$H _3 P$[/tex] B. [tex]$HPO _3$[/tex] C. [tex]$H _3 PO _4$[/tex] D. [tex]$H _3 PO _3$[/tex]

[Terjawab] A student conducted an experiment where she added HCl (a very strong acid) to 4 test tubes containing unknown solutions. She tested the pH of each of the solutions before and after the addition of the acid using pH paper. The color of the pH paper before and after adding acid to the unknown solutions can be seen in the table below. For reference: [tex]$pH 2=$[/tex] red; [tex]$pH 4=$[/tex] orange; [tex]$pH 7=$[/tex] yellow; [tex]$pH 9=$[/tex] green; [tex]$pH 14=$[/tex] purple. | Test Tube | Before adding acid | After adding acid | | --------- | ------------------ | ----------------- | | A | Yellow | Red | | B | Purple | Yellow | | C | Yellow | Yellow | | D | Green | Red | Which of the tubes is the most likely to contain artificial cytoplasm? Multiple Choice Tube D Tube A Tube C Tube B

[Terjawab] The temperature of a 350.0 mL sample of gas increases from 27°C to 277 °C. What is the final volume of the sample of gas if the pressure and amount of gas in the container is kept constant?

[Terjawab] Which is the electronic configuration for oxygen? A. 1s2 2s2 2p1 B. 1s² 2s² 2p3 C. 1s2 2s2 2p4 D. 1s2 2s2 2p6

[Terjawab] What does the 195 represent in the isotope notation? ${ }_{78}^{195} Pt$ A. atomic number B. neutron number C. atomic mass