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Questions in chemistry

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

[Homework Help] Fill in the gaps to balance the equation. Use the smallest set of whole numbers to balance the equation and include coefficients of "1" when appropriate. $\square$ $NaNO _3+$ $\square$ 1 $Cr _2\left( CO _3\right)_3 \rightarrow$ $\square$ 3 $Na_2 CO_3+$ $\square$ 2 $Cr \left( NO _3\right)_3$ Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | |---|---|---| | Na | | | | N | | | | O | | | | Cr | 2 | 2 | | C | | |

[Homework Help] Given the following equilibrium system, what will occur if the system is subjected to an increase in temperature? [tex]CuCl_4^{2-}(a q) g r e e n \rightleftharpoons Cu^{2+}+(a q) b l u e+4 Cl^{1-}(a q)+e n e r g y[/tex] A. Keq will decrease B. the solution will turn more blue C. the solution will shift right D. nothing will change

[Homework Help] Alguien puede traducirlo?: What's the fastest animal in the world?

[Homework Help] Fill in the gaps to balance the equation. Use the smallest set of whole numbers to balance the equation and include coefficients of "1" when appropriate. [tex]$\square$ C _6 H _{13} COOH + $\square$ O _2 \rightarrow $\square$ CO _2+ $\square$ H _2 O[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | |---|---|---| | C | | | | H | | | | O | | |

[Homework Help] A student was comparing the solubility of equal amounts of table salt and table sugar at different temperatures. The table below shows the four samples that the student used and the temperature of the water that they were dissolved in. | Sample | Name | Chemical formula | Temperature of water (${}^{\circ} C$) | | ------ | ----------- | ---------------- | ---------------------------------------- | | 1 | Table sugar | $C_{12}H_{22}O_{11}$ | 80 | | 2 | Table sugar | $C_{12}H_{22}O_{11}$ | 45 | | 3 | Table salt | NaCl | 55 | | 4 | Table salt | NaCl | 63 | Which of the samples most likely had the highest solubility? 1. 1 2. 2 3. 3 4. 4

[Homework Help] If the following equilibrium is subjected to pressure increase, what will happen? [tex]2 NO _2(g)[/tex] brown [tex]\rightleftharpoons N _2 O _4(g)[/tex] colorless + energy A. more reactants will be created B. Keq will increase C. it will become more brown D. it will become more colorless

[Homework Help] Which of the following does NOT describe a t-shaped molecule? A. 2 bonded electron pairs much less than [tex]$109^{\circ}$[/tex] apart, 2 lone pairs B. 3 bonded electron pairs [tex]$90^{\circ}$[/tex] apart, 2 lone pairs C. 3 bonded electrons pairs [tex]$180^{\circ}$[/tex] and [tex]$90^{\circ}$[/tex] apart, 3 lone pairs

[Homework Help] Which mineral resource is used to make batteries? A. graphite B. gypsum C. talc D. clay

[Homework Help] Fill in the gaps to balance the equation. Use the smallest set of whole numbers to balance the equation and include coefficients of "1" when appropriate. [tex]$\square$ LiOH + $\square$ AgI $\rightarrow$ $\square$ LiI + $\square$ AgOH[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | | :------ | :------- | :------- | | Li | | | | O | | | | H | | | | Ag | | | | I | | |