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Questions in chemistry

[Answered] What is the mass of $2.01 \times 10^{23}$ formula units of $CoSO_4$? ($1 mol CoSO_4 = 154.99 g$) ($1 mol CoSO_4 = 6.02 \times 10^{23}$ formula units) [?] g $CoSO_4$

[Answered] What is the molarity of 6 moles $(mol)$ of NaCl dissolved in 2 L of water? A. $\frac{6 mol}{2 L}$ B. $\frac{6 L}{2 mol}$ C. $\frac{2 L}{6 mol}$ D. $\frac{2 mol}{6 L}$

[Answered] Use the periodic table to write the electron configuration of selenium (Se). Place the sublevels in order of filling from least energy to most energy.

[Answered] Which of the following gases must be dissolved in a solvent in order to be stored safely in a cylinder? A. Oxygen B. Propane C. Acetylene D. Carbon monoxide E. Both C and D are correct.

[Answered] Is hydrogen a metal or a nonmetal? How many valence electrons does a hydrogen atom have? Will carbon and hydrogen atoms most likely form an ionic bond or a covalent bond?

[Answered] How many formula units (f.un.) are in [tex]$35.0 g KNO_3$[/tex]? ([tex]$1 mol KNO_3=101.11 g$[/tex]) ([tex]$1 mol KNO_3=6.02 \times 10^{23}$[/tex] formula units) [?] [tex]$\times 10^{[?]} \text { f.un. } KNO_3$[/tex] Enter the coefficient in the green box and the exponent in the yellow box.

[Answered] What type of chemical reaction is illustrated in the following example? [tex]FeBr _3( aq )+ AgNO _3( aq ) \rightarrow Fe \left( NO _3\right)_3( aq )+ AgBr (s)[/tex] A. combination reaction B. decomposition reaction C. single-replacement reaction D. double-replacement reaction

[Answered] Select the correct answer. Based on the reactivities of the elements involved, which reaction will form products that are more stable than the reactants? A. [tex]2 AlBr _3+3 Zn \rightarrow 3 ZnBr _2+2 Al[/tex] B. [tex]CaBr _2+2 Na \rightarrow 2 NaBr + Ca[/tex] C. [tex]MgBr _2+ H _2 \rightarrow 2 HBr + Mg[/tex] D. [tex]BaBr _2+ Ca \rightarrow CaBr _2+ Ba[/tex] E. [tex]2 LiBr + Ba \rightarrow BaBr _2+2 Li[/tex]

[Answered] Read and the products with a suitable coefficient. equation by multiplying the reactants The chemical reaction which occurs by the absorption of heat from the surroundings is called an endothermic reaction. The chemical reaction in which heat is released to the surroundings is called exothermic reaction. Test Your Concept Tick $(\sqrt{ })$ the correct alternative (MCQs); a. What is the type of change in which new substances with different properties are formed? A) physical B) chemical C) reversible D) both A) and B) b. What are the substances that take part in a chemical reaction called? A) products B) solution C) reactants D) mixture C. Which one of the following is the example of a chemical reaction? A) melting of ice B) rusting of iron C) making a salt solution D) magnetizing an iron nail d. Which one of the following chemical reactions is an endothermic reaction? A) $C + O _2 \longrightarrow CO _2$ B) $N _2+ O _2 \rightarrow 2 NO$ C) $Zn +2 HCl \longrightarrow ZnCl _2+ H _2$ D) $CaO + H _2 O \longrightarrow Ca ( OH )_2$ - Short answer type questions:

[Answered] Which of the following is an organic compound? A. vitamins B. minerals