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Questions in chemistry

[Terjawab] Given the table, what is the value of A, B, C, or D?

[Terjawab] In the structure of 4-isopropyl-2,4,5-trimethylheptane, identify the primary, secondary, tertiary, and quaternary carbons. Use the abbreviations: p is primary, s is secondary, t is tertiary and q is quarternary.

[Terjawab] A radioactive nuclide has 53 protons and 78 neutrons. Which is the symbol of this nuclide? A. ${}_{78}^{53}X$ B. ${}_{53}^{78} Pt$ C. ${}_{76}^{131} Pt$ D. ${}_{53}^{131}X

[Terjawab] Use the periodic table to complete this equation that represents nuclear fission processes. ${ }_{92}^{235} U+{ }_0^1 n \rightarrow{ }_{56}^{139} Ba+{ }_{B}^{A} C+3{ }_0^1 n$ A: $\square$ B: $\square$ C: $\square$

[Terjawab] Which is the correct chemical equation for photosynthesis? A. $6 CO _2+6 H _2 O$ ® $C _6 H _{12} O _6+6 O _2$ B. $C _6 H _{12} O _6+6 O _2$ ® $6 CO _2+6 H _2 O$ C. $3 CO _2+3 H _2 O +3 O _2$ ® $C _6 H _{12} O _6$ D. $6 O _2+6 H _2 O$ ® $C _6 H _{12} O _6+6 CO _2$

[Terjawab] If the activation energy required for a chemical reaction were reduced, what would happen to the rate of the reaction? A. The rate would increase. B. The rate would decrease. C. The rate would remain the same. D. The rate would be zero.

[Terjawab] Select the correct answer. What is the solution to the problem expressed to the correct number of significant figures? [tex]$\frac{12.0}{7.11}=[/tex] ? A. 1.688 B. 1.60 C. 1.7 D. 1.70

[Terjawab] A sample of an unknown substance has a mass of 0.158 kg. If [tex]$2,510.0 J$[/tex] of heat is required to heat the substance from [tex]$32.0^{\circ} C$[/tex] to [tex]$61.0^{\circ} C$[/tex], what is the specific heat of the substance? Use [tex]$q =m C _p \Delta T$[/tex].

[Terjawab] Draw the Lewis structure for the hypochlorite ion, $ClO^{-}$. Include lone pairs and formal charges.

[Terjawab] Which scientist believed that the probable, not exact, location of the electrons of an atom can be determined by using mathematics? A. Rutherford B. Bohr C. Dalton D. Schrödinger