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Questions in chemistry

[Terjawab] Adithya wants to classify the following changes as physical or chemical. Can you help him? 1. Melting of ice (P) 2. Ripening of fruits 3. Rusting of iron (P) 4. Spoilage of food 5. Burning of wood (ch) 6. Bursting crackers 7. Burning of camphor (ch) | Physical Changes | Chemical Changes | |---|---| | | |

[Terjawab] Which of the following structures are perspective formulas of the stereoisomers of 2,3-dibromobutane? a. C b. D c. E d. B e. A

[Terjawab] Which cannot be chemically broken down into simpler substances? A. compound B. element C. solution D. mixture

[Terjawab] How much would the freezing point of water decrease if 4 mol of sugar were added to 1 kg of water ( [tex]K_{ f }=1.86^{\circ} C /( mol / kg )[/tex] for water and [tex]i=1[/tex] for sugar)? A. [tex]7.44^{\circ} C[/tex] B. [tex]2.15^{\circ} C[/tex] C. [tex]1.86^{\circ} C[/tex] D. [tex]4.00^{\circ} C[/tex]

[Terjawab] Draw the structure for the most stable chair conformation of trans-1-bromo-4-isopropylcyclohexane. Use the cyclohexane conformation drawing tool and guide points to draw each structure.

[Terjawab] Complete each nuclear reaction. ${ }_2^2 H+{ }_2^2 H \rightarrow{ }_2 He+{ }_0^1 n$ ${ }_{92}^{238} U \rightarrow{ }^{F} Th+{ }_2^8 He$ D: $\square$ F: $\square$ E: $\square$ G: $\square$

[Terjawab] What is revealed in the reaction $Ca ( OH )_2(s) \rightarrow Ca ^{2+}(a q)+2 OH ^{-}(a q)$. $\Delta H=-16.71$? A. The reaction produces heat. B. Heat is one of the reactants. C. The reaction is endothermic. D. The reaction occurs slowly.

[Terjawab] When a solution of formaldehyde and KOH is heated, it will give: (a) acetylene and methane (b) methanol and potassium formate (c) methanol and methane (d) methanol and acetylene

[Terjawab] Water forms according to the equation below [tex]2 H_2(g)+O_2(g) \rightarrow 2 H_2 O(g) \quad \Delta H_{(x n}=183.64 kJ[/tex] How much energy is released during the formation of [tex]1 mol H _2 O ( g )[/tex]?

[Terjawab] DIRECTION: Copy and answer, Complete the table below. Item 1 is given as an example "Household States of Matter - Scavenger Hunt" | Place | Name of Matter | Classification | Characteristics | |---|---|---|---| | Kitchen | water | liquid | water takes the shape of the glass and flows | | Kitchen | | | | | Kitchen | | | | | Bathroom | | | | | Bathroom | | | | | Bathroom | | | | | Living Room | | | | | Living Room | | | | | Living Room | | | | | Garage or Garden | | | | | Garage or Garden | | | | | Garage or Garden | | | | Answer the following questions: 1. Can you share an item you found from the scavenger hunt and explain why you classified it as a solid, liquid, or gas? 2. Were there any items that were difficult to classify? Why do you think that was? 3. How does understanding the states of matter help us interact with objects in our home environment?