平衡下列方程式，方法是加上化学计量比并填入它们的物理状态（s、l、g 或 aq）。  请勿留空，否则系统会判定您答错。化学计量系数请以整数形式填写（不要用分数）。如果化学计量比为 1，请在下面的方框中填写 1。   金属钠与溴反应生成溴化钠。 [Fill in the blank] 钠（[Fill in the blank] ）    +   [Fill in the blank] Br 2([Fill in the blank] ）   →   [Fill in the blank] NaBr （[Fill in the blank] ） 多项填空题

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REACTION:  nitrogen gas is placed in a test tube containing magnesium metal to form solid magnesium nitride Write the balanced chemical reaction by completing the table below. For each of the product, determine what the product will be and place it in the appropriate blank. For example, for the reaction of strontium chloride and sodium iodide, for the "strontium product," type in the formula of the product that contains Sr. Likewise, for "sodium product," type in the formula of the product that contains Na. Please remember to: Write the correct coefficients for all reactants and products. Write the correct states for all reactants and products. (Remember: Do not write 1's in balanced equations.) Write NO RXN for each product if a reaction does NOT occur. DO NOT worry about formatting subscripts. Thus, if two moles of aqueous strontium hydroxide, please type it as 2 Sr(OH)2(aq). DO NOT a space between the formula and the state of the compound, such as: 2 Sr(OH)2(aq). DO add a space between the coefficient and the formula, such as: 2 Sr(OH)2(aq). For the "Description", type one of the following and DO NOT capitalize:   precipitation neutralization gas evolution single displacement combustion combination decomposition NO RXN   [Fill in the blank] + [Fill in the blank] ⟶\longrightarrow [Fill in the blank] gaseous reactant + metal reactant ⟶\longrightarrow solid product Description for this type of reactions:  [Fill in the blank]

Write a balanced reaction for which the following rate relationships are TRUE.

Which is the correct balanced equation for the complete combustion of ethane in excess oxygen? 哪种方程是乙烷在过量氧气中完全燃烧的正确平衡方程？  

Balance the following equations by adding the stoichiometric ratios and inserting their physical state (s, l, g or aq).  Do not leave the boxes blank or it will mark you incorrect.  Report the stoichiometry coefficients as whole numbers (no fractions). If the stoichiometry is 1 please insert 1 in the box(es) below.   Sodium metal reacts with bromine to form sodium bromide. [Fill in the blank] Na([Fill in the blank] )   +   [Fill in the blank] Br2([Fill in the blank] )   →   [Fill in the blank] NaBr([Fill in the blank] )

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