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Questions in chemistry

[Answered] 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.

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

[Answered] 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.

[Answered] 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 | $\square$ | $\square$

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

[Answered] 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]$\square$ RbBr + $\square$ HNO _3 \rightarrow $\square$ RbNO _3+ $\square$ HBr[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | | :------ | :------- | :------- | | Rb | $\square$ | $\square$ | | Br | $\square$ | $\square$ | | H | $\square$ | $\square$ | | N | $\square$ | $\square$ | | O | $\square$ | $\square$

[Answered] 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 _2 H _6+ $\square$ 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 | $\square$ | $\square$ | | H | $\square$ | $\square$ | | O | $\square$ | $\square$ |

[Answered] In addition, which statement below best explains why physical and chemical changes do NOT violate the Law of Conservation of Matter? a. Physical and chemical changes always involve the same reactants and products b. Physical and chemical changes always produce less product than reactant c. Physical and chemical changes do not gain or lose atoms in the formation of the product

[Answered] What concentration of $C$ equals 1 in 10,000 solution of Potassium Permanganate?

[Answered] 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]$\square$ Na _3 N+$ $\square$ SrF _2 \rightarrow$ $\square$ NaF +$ $\square$ Sr _3 N_2[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | | :------ | :------- | :------- | | Na | [tex]$\square$[/tex] | [tex]$\square$[/tex] | | N | [tex]$\square$[/tex] | [tex]$\square$[/tex] | | Sr | [tex]$\square$[/tex] | [tex]$\square$[/tex] | | F | [tex]$\square$[/tex] | [tex]$\square$[/tex] |