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Questions in chemistry

[Answered] Which element is the least reactive, based on the data? | | I (ion) | J (ion) | K (ion) | L (ion) | | :-------- | :----------- | :----------- | :----------- | :----------- | | Element I | X | Color change | Color change | Color change | | Element J | Color change | x | x | x | | Element K | Color change | x | x | Color change | | Element L | x | x | x | x | "X" indicates no reaction A. Element L B. Element I C. Element J D. Element K

[Answered] Fill in the systematic names of the following chemical compounds. Note: for compounds containing hydrogen, you may give the common name instead. | molecular formula | name of compound | | :---------------- | :--------------- | | $Se _4 S_4$ | | | $XeF _6$ | | | $SAs _2$ | | | $XeO _3$ | | | $NH _3$ | |

[Answered] (d) Liquid sulfur reacts with chlorine to produce disulfur dichloride. [tex]2 S+Cl_2 \rightarrow S_2 Cl_2[/tex] (i) Describe how the general physical properties of a liquid differ from those of a solid. Give two differences. 1. 2.

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] An experimenter attempts to carry out a single replacement reaction between solid iron and a solution of magnesium bromide. Which is more reactive, iron or magnesium? Which of the following equations correctly predicts the products of the reaction? i. [tex]Fe _{( s )}+ MgBr _{2( aq )} \rightarrow Br _{2( l )}+2 MgFe _{( aq )}[/tex] ii. [tex]Fe _{( s )}+ MgBr _{2( aq )} \rightarrow FeMgBr _{2(s)}[/tex] iii. [tex]Fe _{( s )}+ MgBr _{2( aq )} \rightarrow Mg _{( s )}+ FeBr _2( aq )[/tex] iv. [tex]Fe _{( s )}+ MgBr _{2( aq )} \rightarrow[/tex] no reaction

[Answered] What is the most common ion charge for nitrogen? A. +5 B. +7 C. -3 D. -1

[Answered] states that in any chemical reaction, the mass of the substances that react equals the mass of the products that are formed. A) The law of conservation of mass B) The law of definite proportions C) The atomic theory of matter D) The law of conservation of matter

[Answered] What is the number of valence electrons in cadmium (Cd)? A. 1 B. 2 C. 10 D. 12

[Answered] 88. An element S has the proton number 18. The next element in the periodic table is an element T. Which statement is correct? A. Element T has one more electron in its outermost shell than element S. B. Element T has one more electron shell than element S. C. Element T is in the same group of the periodic table as element S. D. Element T is in the same period of the periodic table as element S. 89. Substance 'E' when reacts separately with zinc, sodium hydroxide and marble pieces, the respective products formed are hydrogen, sodium chloride and carbon dioxide. Identify the substance 'E'. A. An alkali B. An acid C. An element D. A salt 90. A yellow colored energy drink consists of a dissolved mixture of red and orange coloring agents. Suggest a suitable mean to separate these coloring agents. A. Distillation B. Evaporation C. Filtration D. Chromatography 91. What is the minimum age requirement of a person in Nepal to be eligible to vote in the national election? A. 16 years B. 18 years C. 19 years D. 21 years 92. The headquarter of World Trade Organization is located at London

[Answered] The atomic number of an element is defined as the number of a) electrons in the nucleus of an atom of the element b) neutrons in the nucleus of an atom of the element c) protons and neutrons in an atom of the element d) neutrons and electrons in an atom of element e) protons in the nucleus of an atom of the element