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Questions in chemistry

[Terjawab] Which of the following is NOT a multivalent ion? $Ag^{+}$ $Sb^{5+}$ $Cu^{+}$ $Cr^{3+}$

[Terjawab] 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 | | :---------------- | :---------------- | | $BI _3$ | | | BP | | | $C _3 S_2$ | | | $CS _2$ | | | $H _2 O$ | |

[Terjawab] Which element has the lowest electronegativity? A. Ca B. Mg C. Be D. [tex]Sr^{-}$[/tex]

[Terjawab] The specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The heat capacity of a certain substance has been measured to be $1.66 \frac{J}{ g \cdot{ }^{\circ} C }$. Suppose 149 g of the substance are heated until the temperature of the sample has changed by $42.9^{\circ} C$. Write an equation that will let you calculate the heat $\underline{Q}$ that was needed for this temperature change. Your equation should contain only symbols. Be sure you define each symbol. Your equation: $Q=\square$ Definitions of your symbols: $\square=1.66 \frac{J}{g \cdot{ }^{\circ} C}$ $\square$ - $149 . g$ $\square$ $=42.9^{\circ} C$

[Terjawab] Which atom will have the highest ionization energy? Sr Ba Rb Cs

[Terjawab] Which element has 16 protons in its nucleus? A. neon B. oxygen C. sodium D. sulfur

[Terjawab] What is the most common ion charge for lithium, Li? A. +1 B. +2 C. -1 D. -2

[Terjawab] What is the formula for copper(II) chloride? $CuCl _2$ $ClCu _2$ $Cu _2 Cl$ $Cu _2 Cl _2$

[Terjawab] An experimenter attempts to carry out a single replacement reaction between chlorine gas and a solution of sodium bromide. Which is more reactive - chlorine or bromine? Which of the following equations correctly predicts the products of the reaction? i. [tex]Cl _{2(g)}+2 NaBr _{( aq )} \rightarrow Br _{2( l )}+2 NaCl _{( aq )}[/tex] ii. [tex]Cl _2(g)+ NaBr _{( aq )} \rightarrow NaBrCl _2(s)[/tex] iii. [tex]Cl _{20}+2 NaBr _{( aq )} \rightarrow 2 Na _{( s )}+2 BrCl _{( aq )}[/tex] iv. [tex]Cl _{2(g)}+ NaBr _{( aq )} \rightarrow[/tex] no reaction

[Terjawab] Which model represents the ionic compound sodium oxide, $Na _2 O$ ? A. Na B. 2 Na C. $Na : O _{\bullet \bullet}^{\bullet}: Na$