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Questions in chemistry

[Homework Help] 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

[Homework Help] 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?

[Homework Help] 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

[Homework Help] 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.

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

[Homework Help] 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

[Homework Help] 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.

[Homework Help] 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]

[Homework Help] 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.

[Homework Help] 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.