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Questions in chemistry

[Answered] Do every acrylic hat use –CH₂–CH(CN)–?

[Answered] Consider the equations below. [tex]\begin{array}{c} H_2 \rightarrow 2 H \\ C_2 H_4+H \rightarrow C_2 H_5 \\ C_2 H_5+H \rightarrow C_2 H_6 \end{array}[/tex] When these equations are added together, what will the overall equation be? Assume that no equations need to be reversed. [tex]C _2 H _4+ H _2 \rightarrow C _2 H _6[/tex] [tex]H _2+ C _2 H _4+2 H + C _2 H _5+\rightarrow 2 H + C _2 H _5+ C _2 H _6[/tex] [tex]C _2 H _4+ C _2 H _5+ H _2 \rightarrow C _2 H _5+ C _2 H _6[/tex]

[Answered] a) You're tasked with setting up a chemistry experiment in a laboratory to synthesise a new compound. Choose five apparatuses you would use for this experiment. For each one: * Describe its primary function. * Explain how it contributes to the successful execution of the experiment. * Provide an example of a specific experiment where this apparatus would be essential. b) Discuss five essential laboratory safety protocols that must be followed to ensure safety in the laboratory. For each protocol: * Explain the safety procedure. * Discuss the potential consequences if the protocol is not followed properly. Question 2. Identify and describe three common separation techniques. Explain the principle behind how it works and provide an example of a chemical process or experiment where this technique would be used to separate components.

[Answered] Two masses of gold were measured before they were melted down. What is the total mass of the gold, reported to the appropriate number of significant figures? $\begin{array}{r} 15.650 g \ +10.23 g \ \hline[?] g \end{array}$

[Answered] Consider the following intermediate chemical equations: [tex]$\begin{array}{l} 2 H_2(g)+O_2(g) \rightarrow 2 H_2 O(l) \ H_2(g)+F_2(g) \rightarrow 2 HF(g) \end{array}$[/tex] In the final chemical equation, HF and [tex]$O _2$[/tex] are the products that are formed through the reaction between [tex]$H _2 O$[/tex] and [tex]$F _2$[/tex]. Before you can add these intermediate chemical equations, you need to alter them by multiplying the A. second equation by 2 and reversing the first equation. B. first equation by 2 and reversing it. C. first equation by (1 / 2) and reversing the second equation. D. second equation by 2 and reversing it.

[Answered] Consider the following intermediate chemical equations: [tex]$\begin{array}{l} 2 H_2(g)+O_2(g) \rightarrow 2 H_2 O(l) \ H_2(g)+F_2(g) \rightarrow 2 HF(g) \end{array}$[/tex] In the final chemical equation, HF and [tex]$O _2$[/tex] are the products that are formed through the reaction between [tex]$H _2 O$[/tex] and [tex]$F _2$[/tex]. Before you can add these intermediate chemical equations, you need to alter them by multiplying the A. second equation by 2 and reversing the first equation. B. first equation by 2 and reversing it. C. first equation by (1 / 2) and reversing the second equation. D. second equation by 2 and reversing it.

[Answered] How do changes in state (e.g., boiling, freezing) illustrate the concept of physical changes? What is happening at the molecular level during these changes?

[Answered] Consider the following intermediate chemical equations: [tex] \begin{array}{l} CH_4(g)+2 O_2(g) \rightarrow CO_2(g)+2 H_2 O(g) \ 2 H_2 O(g) \rightarrow 2 H_2 O(l) \end{array} [/tex] Which overall chemical equation is obtained by combining these intermediate equations? [tex]CH _4(g)+2 O _2(g) \rightarrow CO _2(g)+2 H _2 O ( l )[/tex] [tex]CH _4(g)+2 O _2(g) \rightarrow CO _2(g)+2 H _2 O ( g )[/tex] [tex]CH _4(g)+2 O _2(g) \rightarrow CO _2(g)+4 H _2 O ( g )+2 H _2 O ( l )[/tex] [tex]CH _4(g)+2 O _2(g) \rightarrow CO _2(g)+6 H _2 O ( g )[/tex]

[Answered] What is the final chemical equation from the following intermediate chemical equations? [tex] \begin{array}{l} P_4 O_6(s) \rightarrow P_4(s)+3 O_2(g) \ P_4(s)+5 O_2(g) \rightarrow P_4 O_{10}(s) \end{array} [/tex]

[Answered] Two masses of carbon were combined in a flask. What is the total mass of carbon, reported to the appropriate number of significant figures? [tex] \begin{array}{r} 8.2 g \ +0.6634 g \ \hline[?] g \end{array} [/tex]