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Questions in chemistry

[Terjawab] What is the basic unit of matter? A. atom B. molecule C. gas D. compound

[Terjawab] In this equation, $H _2 SO _4$ (sulfuric acid) is speeding up the reaction. Based on the chemical notation, sulfuric acid is A. an ion B. a product C. a reactant D. a catalyst

[Terjawab] sodium nitrate + water $\rightarrow$ saturated solution At $40^{\circ} C$ 104 g + 100 g $\rightarrow$ 204 g At $40^{\circ} C$ 204 g of saturated solution contains 104 g of sodium nitrate 25.5 g of saturated solution contains =? $\begin{array}{l} =\frac{25.5g \times 104g}{204g} \\ =13.00 g \end{array}$

[Terjawab] Convert the temperature of dry ice, $-77.0^{\circ} C$, into ${ }^{\circ} F$. $[?]{ }^{\circ} F$

[Terjawab] Fill in the name and empirical formula of each ionic compound that could be formed from the ions in this table: | cation | anion | empirical formula | name of compound | |---|---|---|---| | [tex]Mg^{2+}[/tex] | [tex]MnO_4^-[/tex] | | | [tex]Cr^{3+}[/tex] | [tex]OH^-[/tex] | | | [tex]Ca^{2+}[/tex] | [tex]NO_3^-[/tex] | |

[Terjawab] Perform the following mathematical operation, and report the answer to the correct number of significant figures. [tex]$0.0030 \times 8.65=[?]$[/tex]

[Terjawab] Which statement best describes the relationship between activation energy and rate of reaction? A. Increasing the activation energy can increase the rate of a reaction. B. Reducing the activation energy can increase the rate of a reaction. C. Increasing the reaction energy does not alter the rate of reaction. D. Reducing the activation energy can decrease the rate of a reaction.

[Terjawab] Balance the entire chemical reaction using an atom inventory. Remember to balance each element in the reaction. [tex]HBr+Ba(OH)_2 \rightarrow BaBr_2+H_2 O[/tex] When the reaction is balanced, what is the correct whole number coefficient for hydrobromic acid, HBr?

[Terjawab] Listen Which classification of matter includes materials that can no longer be identified their individual properties? A) Mixture B) Atom C) Compound D) Element

[Terjawab] For a certain chemical reaction, the equilibrium constant [tex]K=6.6 \times 10^6[/tex] at [tex]25.0{ }^{\circ} C[/tex]. Calculate the standard Gibbs free energy of reaction. Round your answer to 2 significant digits.