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Questions in chemistry

[Answered] Which element will have the smallest atomic radius? nitrogen (N) arsenic (As) antimony (Sb) phosphorus (P)

[Answered] Which element will have the largest atomic radius? potassium (K) germanium (Ge) calcium (Ca) gallium (Ga)

[Answered] Correct Add or subtract the following measurements. Be sure each answer you enter contains the correct number of significant figures. [tex]\begin{aligned} 14.6 mL+15.50 mL & =30.1 mL \\ 15.61 mL-5.5 mL & =10.1 mL \\ 3.520 mL+18.8 mL & =22.3 mL \end{aligned}[/tex]

[Answered] Fill in the name and empirical formula of each ionic compound that could be formed from the ions in | cation | anion | empirical formula | name of compound | |---|---|---|---| | [tex]$K ^{+}$[/tex] | [tex]$ClO _3^{-}$[/tex] | | | | [tex]$Na ^{+}$[/tex] | [tex]$ClO _4^{-}$[/tex] | | | | [tex]$Na ^{+}$[/tex] | [tex]$ClO _3^{-}$[/tex] | | |

[Answered] Which is another name for groups of elements? A. actinides B. families C. halogens D. periods.

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] A chemist needs to know the mass of a sample of [tex]$MgCl _2$[/tex] to 5 significant digits. He puts the sample on a digital scale. This is what the scale shows: 0 0 4 0 7 If this measurement is precise enough for the chemist, round it to 5 significant digits. Otherwise, press the "No solution" button.

[Answered] Count the significant digits in each of these measurements: | measurement | number of significant digits | | :---------------------- | :----------------------------- | | [tex]$4.3 \times 10^{-3} mL$[/tex] | $\square$ | | [tex]$72700 . kg$[/tex] | $\square$ | | 0.005100 J | $\square$ | | [tex]$-6.0 \times 10^{-1} kJ / mol$[/tex] | $\square$ |

[Answered] Fill in the missing part of the student's equation: $\frac{(1.69 \square)(\frac{1 mL}{10^{-3} L})}{(81.19 \frac{g}{mol})}=20.8 \frac{mol}{L}$

[Answered] Count the significant digits in each of these measurements: | measurement | number of significant digits | | ----------- | ----------------------------- | | [tex]$4.3 \times 10^{-3} mL$[/tex] | | | [tex]$72700 . kg$[/tex] | | | 0.005100 J | | | [tex]$-6.0 \times 10^{-1} kJ / mol$[/tex] | |