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Questions in chemistry

[Terjawab] Which reaction is endothermic? A. [tex]HCl + NaOH \rightarrow NaCl + H _2 O +58 kJ[/tex] B. [tex]6 CO _2+12 H _2 O +[/tex] energy [tex] \rightarrow C _6 H _{12} O _6+6 O _2+6 H _2 O[/tex] C. [tex]2 Na + Cl _2 \rightarrow 2 NaCl +[/tex] energy D. [tex]2 C _2 H _6+7 O _2 \rightarrow 4 CO _2+6 H _2 O +2,502 kJ[/tex]

[Terjawab] How many electrons can occupy the shell having [tex]$n=2$[/tex]? A. 18 B. 8 C. 2 D. 6 E. 32

[Terjawab] Predict the products of the following reaction: a. C b. F c. B d. D e. E f. A

[Terjawab] Which statement best explains the change that occurs when gas particles move more slowly? A. The temperature increases because the average kinetic energy decreases. B. The temperature increases because the average kinetic energy increases. C. The temperature decreases because the average kinetic energy decreases. D. The temperature decreases because the average kinetic energy increases.

[Terjawab] Write the empirical formulas for the compound containing carbon to hydrogen in the following ratios: (a) 1:4 (b) 2:6 (c) 2:2 (d) 6:6

[Terjawab] Guide Questions: 1. What happened to the sugar and water particles in the solution? What do you think their particle arrangement looks like in the solution? 2. How will you explain your observations in terms of the idea that particles of matter have spaces between them?

[Terjawab] Drag each tile to the correct box. Elements of each group in the periodic table have certain characteristic properties. Match each group to the correct property. Refer to the periodic table if you need help. [Periodic Table Image - Not Rendered] alkali metals halogens noble gases

[Terjawab] Transition metals can also be called A. precious metals. B. p-block elements. C. d-block elements. D. s-block elements. E. f-block elements.

[Terjawab] Reaction(s) released heat. Reaction released the most heat per mole of reactant.

[Terjawab] Which best describes a compound such as sodium chloride? A. a pure substance that can be separated into different elements by physical means B. a mixture of two common substances that can be separated by chemical means C. a mixture of two common elements that can be separated by physical means D. a pure substance that can be separated into different elements by chemical means