VincenTragosta - Tanya, Jawab, dan Belajar Tanpa Batas Logo

Questions in chemistry

[Terjawab] Which of these compounds is a weak electrolyte? NaCl [tex]$C _6 H _{12} O _6$[/tex] (glucose) [tex]$O _2$[/tex] [tex]$CH _3 COOH$[/tex] (acetic acid) HCI

[Terjawab] What volume of ethanol (density $=0.7893 g / cm ^3$ ) should be added to 450. mL of water in order to have a solution that freezes at $-15.0^{\circ} C$ ? Assume the density of water is $1.0 g / mL$. (For water, $K_f=1.86^{\circ} C / m$.) A. 470 mL B. 167 mL C. 371 mL D. 212 mL E. 132 mL

[Terjawab] What is a reaction rate? A. The amount of products produced in a reaction B. The frequency of reactant collisions C. The energy required for a reaction to happen D. The speed at which a reaction occurs

[Terjawab] A) [tex]$C + O _2 \longrightarrow CO _2$[/tex] [tex]$BN _2+ O _2 \rightarrow 2 NO$[/tex] C) [tex]$Zn +2 HCl \longrightarrow ZnCl _2+ H _2$[/tex] D) [tex]$CaO + H _2 O \longrightarrow Ca ( OH )_2$[/tex] Short answer type questions: a. What are reactants and products? b. What is a balanced chemical equation? c. Write down the balanced chemical equation of the reaction between zinc and hydrochloric acid. What type of chemical reaction is this? d. What is endothermic reaction?

[Terjawab] The elements which tend to achieve a two-electron configuration in the valence shell: (a) Hydrogen (b) Lithium (c) Beryllium (d) All of these

[Terjawab] Complete this activity to identify basic chemical structure. Match the words to their definitions. Match each item to a choice: Choices: Matter Element Chemistry Simplest form of chemical matter The science that deals with the composition, structures, and properties of matter Any substance that occupies space and has mass

[Terjawab] What is the mass of [tex]$1.8 \times 10^{24}$[/tex] molecules of [tex]$CO_2$[/tex]? ([tex]$1 mol CO_2=44.01 g$[/tex]) ([tex]$1 mol CO_2=6.02 \times 10^{23}$[/tex] molecules) [?] [tex]$g CO_2$[/tex]

[Terjawab] Sulfur dioxide reacts with chlorine to produce thionyl chloride. [tex]SO_2(g)+2 Cl_2(g) \rightarrow SOCl_2(g)+ Cl _2 O ( g )[/tex] If 0.400 mol of [tex]Cl _2[/tex] reacts with excess [tex]SO _2[/tex], how many moles of [tex]Cl _2 O[/tex] are formed? A. 0.400 mol B. 0.200 mol C. 0.0500 mol D. 0.100 mol E. 0.800 mol

[Terjawab] Ethanol, an organic compound, has the following structural formula. What is the chemical formula for ethanol? A. $CH _6 O$ B. $C _2 H _5 O$ C. $C _2 H _5 O _2$ D. $C _2 H _6 O$

[Terjawab] What Group is Zn (zinc) in? A. 12 B. 30 C. 2 A D. 4