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Questions in chemistry

📝 Answered - 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. $6 O _2+6 H _2 O$ ® $C _6 H _{12} O _6+6 CO _2$

📝 Answered - 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.

📝 Answered - 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

📝 Answered - 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].

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

📝 Answered - 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

📝 Answered - A scientist wants to determine how many moles of copper (II) oxide (CuO) would be needed to make 8.10 mol of gold (III) oxide [tex]$\left( Au _2 O _3\right)$[/tex]. [tex]$2 Au+3 CuO-Au_2 O_3+3 Cu$[/tex] How many moles of copper (II) oxide would be needed? [tex]$8.10 mol Au _2 O _3$[/tex] [$\square$] [$\square$] mol CuO , [$\square$] mol CuO [tex]$mol Au I _2 O _3$[/tex]

📝 Answered - What is produced when calcium reacts with fluorine in a synthesis reaction? [tex]Ca + F _2 \rightarrow[/tex] ? A. [tex]CaF[/tex] B. [tex]CaF _4[/tex] C. [tex]2CaF[/tex] D. [tex]CaF _2[/tex]

📝 Answered - What is the formula for iron(III) fluoride? A. FeF B. $Fe _3 F_3$ C. $FeF _3$ D. FesF

📝 Answered - Which type of reaction occurs in the core of a nuclear reactor in a nuclear power plant? [tex]HCl + NaOH \rightarrow H _2 O + NaCl[/tex] [tex]{ }_{92}^{235} U +{ }_0^1 n \rightarrow{ }_{38}^{90} Sr +{ }_{54}^{143} Xe +3_0^1 n[/tex] [tex]{ }_{38}^{90} Sr +{ }_{54}^{143} Xe +3_0^1 n \rightarrow{ }_{92}^{238} U +{ }_0^1 n[/tex] [tex]C _{10} H _8+12 O _2 \rightarrow 10 CO _2+4 H _2 O[/tex]