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Questions in chemistry

[Terjawab] In a given chemical reaction, the energy of the products is greater than the energy of the reactants. Which statement is true for this reaction? A. Energy is absorbed in the reaction. B. Energy is released in the reaction. C. No energy is transferred in the reaction. D. Energy is created in the reaction. E. Energy is lost in the reaction.

[Terjawab] The iron in the compound has a charge of [tex]$Fe^{+2}$[/tex]. What is the formula of iron(II) chromate? chromate ion: [tex]$(CrO_4)^{-2}$[/tex] A. [tex]$FeCr_2O_7$[/tex] B. [tex]$FeCrO_4$[/tex] C. [tex]$Fe(CrO_4)_2$[/tex] D. [tex]$Fe_2CrO_4$[/tex]

[Terjawab] How many joules of energy are needed to melt 15.5 g of ice and heat it to $27.0^{\circ} C$?

[Terjawab] Which of the following does not describe a linear molecule? A. 2 bonded electron pairs $180^{\circ}$ apart, 4 lone pairs B. 3 bonded electron pairs $180^{\circ}$ and $90^{\circ}$ apart, 3 lone pairs C. 2 bonded electron pairs $180^{\circ}$ apart, 3 lone pairs D. 2 bonded electron pairs $180^{\circ}$ apart, 0 lone pairs

[Terjawab] Based on the Law of Conservation of Mass, what mass of products form when baking soda decomposes? [tex]$NaHCO _3 \rightarrow Na _2 CO _3+ H _2 O + CO _2$[/tex] 25.00 g ? g Give your answer to the correct number of significant figures.

[Terjawab] 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]$\square$ LiI + $\square$ H _2 SO _4 \rightarrow $\square$ Li _2 SO _4+ $\square$ HI[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | | :------ | :------- | :------- | | Li | $\square$ | $\square$ | | I | $\square$ | $\square$ | | H | $\square$ | $\square$ | | S | $\square$ | $\square$ | | O | $\square$ | $\square$

[Terjawab] 60.0 g of iron, 80.0 g of copper, and 50.0 g of aluminum were each initially at 25°C. If each of these substances gained 100 J of heat, which would have the highest temperature? * 60.0 g of Fe (specific heat of Fe = 0.450 J/g.°C) * 50.0 g of Al (specific heat of Al = 0.902 J/g.°C) * 80.0 g of Cu (specific heat of Cu = 0.385 J/g.°C) A. All three substances would have the same temperature. B. There is no way to determine.

[Terjawab] What is the name of this ion? $C_2 H_3 O_2^{-}$ | | | | :-------- | :------- | | acetate | cyanide | | hydronium | bicarbonate |

[Terjawab] What is the formula of aluminum acetate? $\left( C _2 H _3 O _2\right)_3 Al$ $AlC _2 H _3 O _{23}$ AlAc $Al \left( C _2 H _3 O _2\right)_3$

[Terjawab] The arrangement of electrons around the nucleus is referred to as (A) electron configuration (B) valence electrons.