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Questions in chemistry

[Terjawab] What leads to the formation of an ionic bond with $Hg^{2+}$? A. the attraction of a noble gas B. the attraction of an $NH_4^{+}$ ion C. the attraction of a group 1 element D. the attraction of an $SO_4^{2-}$ ion

[Terjawab] How many atoms does 32 g of sulfur contain? A. $32 \times\left(6.02 \times 10^{23}\right)$ B. $\frac{6.02 \times 10^{23}}{16}$ C. $6.02 \times 10^{23}$ D. $\frac{6.02 \times 10^{23}}{32}$

[Terjawab] Complete this activity to identify basic chemical structure. Match the words to their definitions. Match each item to a choice: Choices: Molecule Atom The basic unit of matter Chemical combinations of two or more atoms

[Terjawab] Classify each of the following compounds according to its functional group. a. [tex]$CH _3- CH _2- CH = CH - CH _3$[/tex] b. [tex]$CH _3- CH _2- CH _2- OH$[/tex] c. [tex]$CH _3- CH _2- CH _2- O - CH _2- CH _3$[/tex] d. e.

[Terjawab] The label on a gas cylinder will tell you... A. the molecular weight of the gas. B. the name of the gas. C. the hazards associated with the gas. D. Both B and C are correct. E. All of the above are correct.

[Terjawab] How many moles of [tex]$O_2$[/tex] gas react with 2 moles of NO gas according to the following balanced chemical equation? [tex]2 NO(g)+O_2(g) \longrightarrow 2 NO_2(g)[/tex] A. [tex]$2 mol O_2$[/tex] B. [tex]$4 mol O_2$[/tex] C. [tex]$1 mol O_2$[/tex] D. [tex]$0.5 mol O_2$[/tex] E. none of the above

[Terjawab] A molecule contains 18 atoms and undergoes a physical change. How does the physical change affect the total number of atoms of each element? A. It remains the same. B. It increases C. It changes to zero. D. It decreases

[Terjawab] What criteria are used to classify fires? A. The type of materials that are on fire (what is fueling the fire) B. The size of the fire and how fast it is spreading C. The location of the nearest fire extinguisher D. All of the above

[Terjawab] A radioactive nuclide that is used to label blood platelets has 49 protons and 62 neutrons. Which is the symbol of this nuclide? ${ }_{62}^{49} \ln$ ${ }_{49}^{62} \ln$ ${ }_{111}^{49} \ln$ ${ }_{49}^{111} \ln

[Terjawab] What are homogeneous mixtures of metals commonly called? A. alloys B. colloids C. compounds D. suspensions