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Questions in chemistry

[Terjawab] Using the phase diagram for CO2, what phase is carbon dioxide in at 20°C and 25 atm pressure? A. It is at its boiling point. B. It is in the gas phase. C. It is at its melting point. D. It is in the liquid phase.

[Terjawab] Which substance in this redox reaction is the oxidizing agent? [tex]Cu+2 AgNO_3 \rightarrow 2 Ag+Cu(NO_3)_2[/tex] A. N B. [tex]AgNO_3[/tex] C. Cu D. [tex]NO_3^{-}[/tex] E. [tex]Cu(NO_3)_2[/tex]

[Terjawab] The conversion of graphite has only a small positive value of ΔH. C (graphite) → C (diamond) ΔH = +2.1 kJ mol⁻¹ However, the production of synthetic diamonds using this reaction is very difficult. Which statements help to explain this? 1. The activation energy of the reaction is large. 2. An equilibrium exists between diamond and graphite. 3. Only exothermic reactions can be made to occur readily.

[Terjawab] 1. Go on a Matter Hunt at home or in your community. Find at least: * 3 examples of solids * 2 examples of liquids * 2 examples of gases (describe or draw if not directly observable) 2. Record your findings in a creative way. For each item, write: * Its name * Its state of matter (solid, liquid, gas) * A short explanation of its properties 3. Put your output on a long bond paper.

[Terjawab] Step 2 Since the half-life is 30 years, then [tex]y(30)=[/tex] ______ 5 mg. Step 3 Thus, [tex]5=10 e^{30 k}[/tex], or [tex]e^{30 k}=[/tex] ______. Therefore, [tex]k=[/tex] ______.

[Terjawab] Draw the structure for the most stable chair conformation of cis-1-tert-butyl-3-chlorocyclohexane. Use the cyclohexane conformation drawing tool and guide points to draw each structure.

[Terjawab] Determine the usefulness and harmfulness of each given substance. | Substances | Usefulness | Harmfulness | |---|---|---| | baking soda | | | | sugar | | |

[Terjawab] How many hydrogen atoms can be bonded to one carbon atom? A. 2 B. 4 C. 1 D. 3

[Terjawab] $2 C_6 H_{14}+19 O_2 \rightarrow 12 CO_2+14 H_2 O$ The molar mass of each substance is provided in the table below. | Substance | Molar Mass $( g / mol )$ | | :------------------------- | :----------------- | | Hexane $\left( C _4 H _4\right)$ | 86.17 | | Oxygen $\left( O _2\right)$ | 32.00 | | Carbon dioxide $\left( CO _2\right)$ | 44.01 | | Water $\left( H _2 O \right)$ | 18.02 | What mass of oxygen would be needed?

[Terjawab] Select the correct answer. The average atomic mass of oxygen is 15.9994 amu. The atomic masses of its three isotopes are as follows: O-16: 15.995 amu; O-17: 16.999 amu; O-18: 17.999 amu. Which isotope is most likely to have the greatest abundance in nature? A. O-16 B. O-17 C. O-18