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Questions in chemistry

[Terjawab] Write a complete balanced equation when solid sulphur is (a) burnt in oxygen. (b) heated with iron.

[Terjawab] Identify the type of each of the following reactions, stating the reason for your answers. A. [tex]$Fe _2 O _3+2 Al \rightarrow Al _2 O _3+2 Fe +$[/tex] heat B. [tex]$Pb \left( NO _3\right)_2+2 KI \rightarrow PbI _2(\downarrow)+2 KNO _3$[/tex]

[Terjawab] Identify the type of each of the following reactions, stating the reason for your answers. A. [tex]Fe _2 O _3+2 Al \rightarrow Al _2 O _3+2 Fe +[/tex] heat B. [tex]Pb \left( NO _3\right)_2+2 KI \rightarrow PbI _2(\downarrow)+2 KNO _3[/tex]

[Terjawab] (b) Heated with iron. [tex]Fe_{(s)} + CS_2(g) =\ \textgreater \ FeS_{(s)} + C_{(s)}[/tex] QUESTION 4 Burning magnesium reacts with carbon dioxide to form carbon and a white solid. (i) Write the name of the white solid. (ii) Explain why this reaction is an example of redox (reduction - oxidation) reaction. (iii) Define oxidation in terms of oxidation number.

[Terjawab] What should you do if you cannot find the Safety Data Sheet (SDS) for the chemical you are going to work with? A. Read the label on the container and proceed with the work B. Ask your supervisor for and read the SDS before proceeding with the work C. Ask a new employee, who has recently been trained, about the hazardous chemical D. Contact the Centers for Disease Control for a new SDS

[Terjawab] Fill in the name and empirical formula of each ionic compound that could be formed from the ions in this table: | cation | anion | empirical formula | name of compound | |---|---|---|---| | [tex]Pb ^{2+}[/tex] | [tex]C _2 H _3 O _2^{-}[/tex] | | | | [tex]Ca ^{2+}[/tex] | [tex]NO _3^{-}[/tex] | | | | [tex]K ^{+}[/tex] | [tex]CH _3 CO _2^{-}[/tex] | | |

[Terjawab] Which of these changes is an example of a physical change? A. lighting a candle B. bleaching a shirt C. burning oil

[Terjawab] Name the empirical formula and name of each ionic compound that could be formed from the ions in this table: | cation | anion | empirical formula | name of compound | |---|---|---|---| | [tex]$Ba ^{2+}$[/tex] | [tex]$P ^{3-}$[/tex] | | | | [tex]$Ba ^{2+}$[/tex] | [tex]$N ^{3-}$[/tex] | | | | [tex]$Ba ^{2+}$[/tex] | [tex]$S ^{2-}$[/tex] | | | | [tex]$Ba ^{2+}$[/tex] | [tex]$O ^{2-}$[/tex] | | |

[Terjawab] What can cause a compressed gas cylinder to explode? A. A mislabeled cylinder B. Excessive pressure within the cylinder C. Abuse or misuse of the cylinder D. B and C are correct

[Terjawab] In your understanding, what is destructive distillation of coal?